diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ca07def655f..a52e70c4335 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,16 +1,14 @@
 stages:
   - test
   - build
-  - package
   - publish
-  - docs
+  - optional
 
 image:                             parity/rust:gitlab-ci
 
 variables:
   CI_SERVER_NAME:                  "GitLab CI"
-  CARGO_HOME:                      "${CI_PROJECT_DIR}/cargo"
-
+  CARGO_HOME:                      "${CI_PROJECT_DIR}/.cargo"
   BUILD_TARGET:                    ubuntu
   BUILD_ARCH:                      amd64
   CARGO_TARGET:                    x86_64-unknown-linux-gnu
@@ -18,20 +16,15 @@ variables:
 cache:
   key:                             "${CI_JOB_NAME}"
   paths:
-    - ${CI_PROJECT_DIR}/target/
-    - ${CI_PROJECT_DIR}/cargo/
+    - ./target
+    - ./.cargo
 
 .releaseable_branches:             # list of git refs for building GitLab artifacts (think "pre-release binaries")
   only:                            &releaseable_branches
-    - master
     - stable
     - beta
     - tags
-
-.publishable_branches:             # list of git refs for publishing builds to the "production" locations
-  only:                            &publishable_branches
-    - nightly # Our nightly builds from schedule, on `master`
-    - "v2*" # Our version tags
+    - schedules
 
 .collect_artifacts:                &collect_artifacts
   artifacts:
@@ -41,68 +34,24 @@ cache:
     paths:
     - artifacts/
 
-.determine_version:
-  before_script:                   &determine_version
-    - >
-      VERSION="$(sed -r -n '1,/^version/s/^version = "([^"]+)".*$/\1/p' < Cargo.toml)";
-      if [ "${CI_COMMIT_REF_NAME}" = "nightly" ]; then
-        COMMIT_REF_SHORT="echo ${CI_COMMIT_REF} | grep -oE '^.{7}')";
-        DATE_STRING="$(date +%Y%m%d)";
-        export VERSION="${VERSION}-${COMMIT_REF_SHORT}-${DATE_STRING}";
-      fi;
-      export VERSION;
-      echo "Version: $VERSION"
-
-
-#### stage:                        test
+.determine_version:                &determine_version
+  - VERSION="$(sed -r -n '1,/^version/s/^version = "([^"]+)".*$/\1/p' Cargo.toml)"
+  - DATE_STR="$(date +%Y%m%d)"
+  - ID_SHORT="$(echo ${CI_COMMIT_SHA} | cut -c 1-7)"
+  - test "${CI_COMMIT_REF_NAME}" = "nightly" && VERSION="${VERSION}-${ID_SHORT}-${DATE_STR}"
+  - export VERSION
+  - echo "Version = ${VERSION}"
 
-test-rust-stable:                  &test
+test-linux:
   stage:                           test
+  variables:
+    RUN_TESTS:                     all
   script:
-    - scripts/gitlab/test.sh stable
+    - scripts/gitlab/test-all.sh stable
   tags:
     - rust-stable
 
-.optional_test:                    &optional_test
-  <<:                              *test
-  allow_failure:                   true
-  only:
-    - master
-
-test-rust-beta:
-  <<:                              *optional_test
-  script:
-    - scripts/gitlab/test.sh beta
-
-test-rust-nightly:
-  <<:                              *optional_test
-  script:
-    - scripts/gitlab/test.sh nightly
-
-test-lint-rustfmt:
-  <<:                             *optional_test
-  script:
-    - scripts/gitlab/rustfmt.sh
-
-test-lint-clippy:
-  <<:                             *optional_test
-  script:
-    - scripts/gitlab/clippy.sh
-
-test-coverage-kcov:
-  stage:                           test
-  only:
-    - master
-  script:
-    - scripts/gitlab/coverage.sh
-  tags:
-    - shell
-  allow_failure:                   true
-
-
-#### stage:                        build
-
-build-linux-ubuntu-amd64:          &build
+build-linux:
   stage:                           build
   only:                            *releaseable_branches
   variables:
@@ -112,59 +61,23 @@ build-linux-ubuntu-amd64:          &build
   <<:                              *collect_artifacts
   tags:
     - rust-stable
-  allow_failure: true
-
-build-linux-ubuntu-i386:
-  <<:                              *build
-  image:                           parity/rust-i686:gitlab-ci
-  variables:
-    CARGO_TARGET:                  i686-unknown-linux-gnu
-  tags:
-    - rust-i686
-
-build-linux-ubuntu-arm64:
-  <<:                              *build
-  image:                           parity/rust-arm64:gitlab-ci
-  variables:
-    CARGO_TARGET:                  aarch64-unknown-linux-gnu
-  tags:
-    - rust-arm
-
-build-linux-ubuntu-armhf:
-  <<:                              *build
-  image:                           parity/rust-armv7:gitlab-ci
-  variables:
-    CARGO_TARGET:                  armv7-unknown-linux-gnueabihf
-  tags:
-    - rust-arm
-
-build-linux-android-armhf:
-  <<:                              *build
-  image:                           parity/rust-android:gitlab-ci
-  variables:
-    CARGO_TARGET:                  armv7-linux-androideabi
-  tags:
-    - rust-arm
 
-build-darwin-macos-x86_64:
-  <<:                              *build
+build-darwin:
+  stage:                           build
+  only:                            *releaseable_branches
   variables:
     CARGO_TARGET:                  x86_64-apple-darwin
     CC:                            gcc
     CXX:                           g++
+  script:
+    - scripts/gitlab/build-unix.sh
   tags:
-    - osx
+    - rust-osx
   <<:                              *collect_artifacts
 
-build-windows-msvc-x86_64:
+build-windows:
   stage:                           build
   only:                            *releaseable_branches
-  cache:
-    key:                           "%CI_JOB_NAME%"
-    paths:
-      - "%CI_PROJECT_DIR%/target/"
-      - "%CI_PROJECT_DIR%/cargo/"
-      # No cargo caching, since fetch-locking on Windows gets stuck
   variables:
     CARGO_TARGET:                  x86_64-pc-windows-msvc
   script:
@@ -173,131 +86,74 @@ build-windows-msvc-x86_64:
    - rust-windows
   <<:                              *collect_artifacts
 
-
-#### stage:                        package
-
-package-linux-snap-amd64:          &package_snap
-  stage:                           package
+publish-docker:
+  stage:                           publish
   only:                            *releaseable_branches
   cache: {}
-  before_script:                   *determine_version
-  variables:
-    CARGO_TARGET:                  x86_64-unknown-linux-gnu
   dependencies:
-    - build-linux-ubuntu-amd64
-  script:
-    - scripts/gitlab/package-snap.sh
+    - build-linux
   tags:
-    - rust-stable
-  <<:                              *collect_artifacts
-
-package-linux-snap-i386:
-  <<:                              *package_snap
-  variables:
-    BUILD_ARCH: i386
-    CARGO_TARGET:                  i686-unknown-linux-gnu
-  dependencies:
-    - build-linux-ubuntu-i386
-
-package-linux-snap-arm64:
-  <<:                              *package_snap
-  variables:
-    BUILD_ARCH: arm64
-    CARGO_TARGET:                  aarch64-unknown-linux-gnu
-  dependencies:
-    - build-linux-ubuntu-arm64
-
-package-linux-snap-armhf:
-  <<:                              *package_snap
-  variables:
-    BUILD_ARCH: armhf
-    CARGO_TARGET:                  armv7-unknown-linux-gnueabihf
-  dependencies:
-    - build-linux-ubuntu-armhf
-
-
-#### stage:                        publish
+    - shell
+  script:
+    - scripts/gitlab/publish-docker.sh parity
 
-publish-linux-snap-amd64:          &publish_snap
+publish-awss3:
   stage:                           publish
-  only:                            *publishable_branches
-  image:                           snapcore/snapcraft:stable
+  only:                            *releaseable_branches
   cache: {}
-  before_script:                   *determine_version
-  variables:
-    BUILD_ARCH:                    amd64
   dependencies:
-    - package-linux-snap-amd64
+    - build-linux
+    - build-darwin
+    - build-windows
+  before_script:                   *determine_version
   script:
-    - scripts/gitlab/publish-snap.sh
+    - scripts/gitlab/publish-awss3.sh
   tags:
-    - rust-stable
-
-publish-linux-snap-i386:
-  <<:                              *publish_snap
-  variables:
-    BUILD_ARCH:                    i386
-  dependencies:
-    - package-linux-snap-i386
-
-publish-linux-snap-arm64:
-  <<:                              *publish_snap
-  variables:
-    BUILD_ARCH:                    arm64
-  dependencies:
-    - package-linux-snap-arm64
-
-publish-linux-snap-armhf:
-  <<:                              *publish_snap
-  variables:
-    BUILD_ARCH:                    armhf
-  dependencies:
-    - package-linux-snap-armhf
+    - shell
 
-publish-docker-parity-amd64: &publish_docker
-  stage:                           publish
-  only:                            *publishable_branches
+docs-jsonrpc:
+  stage:                            optional
+  only:
+    - tags
+  except:
+    - nightly
   cache: {}
-  dependencies:
-    - build-linux-ubuntu-amd64
+  script:
+    - scripts/gitlab/docs-jsonrpc.sh
   tags:
     - shell
-  allow_failure:                   true
-  script:
-    - scripts/gitlab/publish-docker.sh parity
 
-publish-docker-parityevm-amd64:
-  <<:                              *publish_docker
+cargo-audit:
+  stage:                           optional
   script:
-    - scripts/gitlab/publish-docker.sh parity-evm
+    - scripts/gitlab/cargo-audit.sh
+  tags:
+    - rust-stable
 
-publish-github-and-s3:
-  stage:                           publish
-  only:                            *publishable_branches
-  cache: {}
-  dependencies:
-    - build-linux-ubuntu-amd64
-    - build-linux-ubuntu-i386
-    - build-linux-ubuntu-armhf
-    - build-linux-ubuntu-arm64
-    - build-darwin-macos-x86_64
-    - build-windows-msvc-x86_64
-  before_script:                   *determine_version
+build-android:
+  stage:                           optional
+  image:                           parity/rust-android:gitlab-ci
+  variables:
+    CARGO_TARGET:                  armv7-linux-androideabi
   script:
-    - scripts/gitlab/push.sh
+    - scripts/gitlab/build-unix.sh
   tags:
-    - shell
-  allow_failure:                   true
-
+    - rust-arm
 
-####stage:                          docs
+test-beta:
+  stage:                           optional
+  variables:
+    RUN_TESTS:                     cargo
+  script:
+    - scripts/gitlab/test-all.sh beta
+  tags:
+    - rust-beta
 
-docs-rpc-json:
-  stage: docs
-  only:
-    - tags
-  cache: {}
+test-nightly:
+  stage:                           optional
+  variables:
+    RUN_TESTS:                     all
   script:
-    - scripts/gitlab/rpc-docs.sh
+    - scripts/gitlab/test-all.sh nightly
   tags:
-    - shell
+    - rust-nightly
diff --git a/Cargo.lock b/Cargo.lock
index 70da9d14a88..0394db446aa 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -75,7 +75,7 @@ name = "backtrace-sys"
 version = "0.1.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -109,7 +109,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -146,7 +146,7 @@ version = "0.1.0"
 dependencies = [
  "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethbloom 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -168,7 +168,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bytes"
-version = "0.4.9"
+version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -177,7 +177,7 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.0.22"
+version = "1.0.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -196,7 +196,7 @@ version = "0.1.0"
 dependencies = [
  "ethjson 0.1.0",
  "serde_ignored 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -246,16 +246,19 @@ name = "cmake"
 version = "0.1.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "combine"
-version = "2.5.2"
+version = "3.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "ascii 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -393,8 +396,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
  "strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -423,9 +426,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "humantime 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "termcolor 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termcolor 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -450,7 +453,7 @@ version = "0.5.7"
 source = "git+https://github.com/paritytech/rust-secp256k1#db81cfea59014b4d176f10f86ed52e1a130b6822"
 dependencies = [
  "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -462,9 +465,9 @@ dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -492,9 +495,9 @@ dependencies = [
  "either 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "memmap 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "primal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -507,7 +510,7 @@ dependencies = [
  "crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types-serialize 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "fixed-hash 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -547,9 +550,9 @@ dependencies = [
  "keccak-hasher 0.1.1",
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb-memorydb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "kvdb-rocksdb 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kvdb-rocksdb 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "lru-cache 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "macros 0.1.0",
  "memory-cache 0.1.0",
@@ -560,8 +563,8 @@ dependencies = [
  "parity-crypto 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-machine 0.1.0",
  "parity-snappy 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "patricia-trie 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "patricia-trie 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "patricia-trie-ethereum 0.1.0",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -596,12 +599,12 @@ version = "1.12.0"
 name = "ethcore-io"
 version = "1.12.0"
 dependencies = [
- "crossbeam 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-deque 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "timer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -619,7 +622,7 @@ dependencies = [
  "ethcore-transaction 0.1.0",
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fastmap 0.1.0",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "hashdb 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -627,18 +630,18 @@ dependencies = [
  "keccak-hasher 0.1.1",
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb-memorydb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "memory-cache 0.1.0",
  "memorydb 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "patricia-trie 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "patricia-trie 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "patricia-trie-ethereum 0.1.0",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp_derive 0.1.0",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "stats 0.1.0",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -655,8 +658,8 @@ dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -673,15 +676,15 @@ dependencies = [
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethkey 0.3.0",
  "fetch 0.1.0",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "linked-hash-map 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-reactor 0.1.0",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "price-info 1.12.0",
  "rlp 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -712,7 +715,7 @@ version = "1.12.0"
 dependencies = [
  "ansi_term 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "assert_matches 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore-io 1.12.0",
  "ethcore-logger 1.12.0",
@@ -723,20 +726,20 @@ dependencies = [
  "ipnetwork 0.12.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-crypto 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-path 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-snappy 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -759,22 +762,22 @@ dependencies = [
  "ethjson 0.1.0",
  "ethkey 0.3.0",
  "fetch 0.1.0",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-crypto 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "patricia-trie 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "patricia-trie 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "patricia-trie-ethereum 0.1.0",
  "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp_derive 0.1.0",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "transaction-pool 1.13.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -794,21 +797,21 @@ dependencies = [
  "ethcore-transaction 0.1.0",
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethkey 0.3.0",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "kvdb-rocksdb 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kvdb-rocksdb 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-crypto 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -831,8 +834,8 @@ dependencies = [
  "ethcore-sync 1.12.0",
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "kvdb-rocksdb 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kvdb-rocksdb 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "stop-guard 0.1.0",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "trace-time 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -849,8 +852,8 @@ dependencies = [
  "jsonrpc-macros 8.0.0 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "jsonrpc-tcp-server 8.0.0 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -878,10 +881,10 @@ dependencies = [
  "keccak-hasher 0.1.1",
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb-memorydb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "macros 0.1.0",
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -915,7 +918,7 @@ dependencies = [
  "ethbloom 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types-serialize 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "fixed-hash 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
  "uint 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -924,7 +927,7 @@ name = "ethereum-types-serialize"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -933,9 +936,9 @@ version = "0.1.0"
 dependencies = [
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -947,15 +950,15 @@ dependencies = [
  "eth-secp256k1 0.5.7 (git+https://github.com/paritytech/rust-secp256k1)",
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "mem 0.1.0",
  "parity-crypto 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-wordlist 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -969,8 +972,8 @@ dependencies = [
  "panic_hook 0.1.0",
  "parity-wordlist 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
  "threadpool 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -983,16 +986,16 @@ dependencies = [
  "ethkey 0.3.0",
  "itertools 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-crypto 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-wordlist 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1008,10 +1011,10 @@ dependencies = [
  "ethstore 0.2.0",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "panic_hook 0.1.0",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1024,10 +1027,10 @@ dependencies = [
  "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "memory-cache 0.1.0",
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "vm 0.1.0",
 ]
@@ -1047,8 +1050,8 @@ dependencies = [
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pretty_assertions 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "vm 0.1.0",
 ]
@@ -1058,7 +1061,7 @@ name = "fake-fetch"
 version = "0.0.1"
 dependencies = [
  "fetch 0.1.0",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1090,11 +1093,11 @@ dependencies = [
 name = "fetch"
 version = "0.1.0"
 dependencies = [
- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper-rustls 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-timer 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1123,7 +1126,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "fs-swap"
-version = "0.2.3"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1148,7 +1151,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "futures"
-version = "0.1.23"
+version = "0.1.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1156,7 +1159,7 @@ name = "futures-cpupool"
 version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1198,8 +1201,8 @@ dependencies = [
  "ethkey 0.3.0",
  "hidapi 0.3.1 (git+https://github.com/paritytech/hidapi-rs)",
  "libusb 0.3.0 (git+https://github.com/paritytech/libusb-rs)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "protobuf 1.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1240,7 +1243,7 @@ name = "hidapi"
 version = "0.3.1"
 source = "git+https://github.com/paritytech/hidapi-rs#d4d323767d6f27cf5a3d73fbae0b0f2134d579bf"
 dependencies = [
- "cc 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1272,13 +1275,13 @@ version = "0.11.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "base64 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "httparse 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "language-tags 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "mime 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1298,7 +1301,7 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "ct-logs 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustls 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1324,7 +1327,7 @@ name = "igd"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1369,19 +1372,19 @@ dependencies = [
 
 [[package]]
 name = "itoa"
-version = "0.4.2"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "jni"
-version = "0.10.1"
+version = "0.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cesu8 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "combine 2.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "combine 3.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jni-sys 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "walkdir 2.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1403,29 +1406,29 @@ dependencies = [
  "keccak-hasher 0.1.1",
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb-memorydb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "memorydb 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "jsonrpc-core"
 version = "8.0.1"
-source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#6b972b5fd34ada4a7de6aed1a8c92475a907732d"
+source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#a1b2bb742ce16d1168669ffb13ffe856e8131228"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "jsonrpc-http-server"
 version = "8.0.0"
-source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#6b972b5fd34ada4a7de6aed1a8c92475a907732d"
+source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#a1b2bb742ce16d1168669ffb13ffe856e8131228"
 dependencies = [
  "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-core 8.0.1 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
@@ -1438,70 +1441,71 @@ dependencies = [
 [[package]]
 name = "jsonrpc-ipc-server"
 version = "8.0.0"
-source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#6b972b5fd34ada4a7de6aed1a8c92475a907732d"
+source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#a1b2bb742ce16d1168669ffb13ffe856e8131228"
 dependencies = [
  "jsonrpc-core 8.0.1 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "jsonrpc-server-utils 8.0.0 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "parity-tokio-ipc 0.1.5 (git+https://github.com/nikvolf/parity-tokio-ipc)",
+ "parity-tokio-ipc 0.1.5 (git+https://github.com/nikvolf/parity-tokio-ipc?rev=c0f80b40399d7f08ef1e6869569640eb28645f56)",
  "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "jsonrpc-macros"
 version = "8.0.0"
-source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#6b972b5fd34ada4a7de6aed1a8c92475a907732d"
+source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#a1b2bb742ce16d1168669ffb13ffe856e8131228"
 dependencies = [
  "jsonrpc-core 8.0.1 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "jsonrpc-pubsub 8.0.0 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "jsonrpc-pubsub"
 version = "8.0.0"
-source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#6b972b5fd34ada4a7de6aed1a8c92475a907732d"
+source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#a1b2bb742ce16d1168669ffb13ffe856e8131228"
 dependencies = [
  "jsonrpc-core 8.0.1 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "jsonrpc-server-utils"
 version = "8.0.0"
-source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#6b972b5fd34ada4a7de6aed1a8c92475a907732d"
+source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#a1b2bb742ce16d1168669ffb13ffe856e8131228"
 dependencies = [
- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "globset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-core 8.0.1 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-timer 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "jsonrpc-tcp-server"
 version = "8.0.0"
-source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#6b972b5fd34ada4a7de6aed1a8c92475a907732d"
+source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#a1b2bb742ce16d1168669ffb13ffe856e8131228"
 dependencies = [
  "jsonrpc-core 8.0.1 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "jsonrpc-server-utils 8.0.0 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "jsonrpc-ws-server"
 version = "8.0.0"
-source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#6b972b5fd34ada4a7de6aed1a8c92475a907732d"
+source = "git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11#a1b2bb742ce16d1168669ffb13ffe856e8131228"
 dependencies = [
  "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-core 8.0.1 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "jsonrpc-server-utils 8.0.0 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ws 0.7.5 (git+https://github.com/tomusdrw/ws-rs)",
 ]
@@ -1549,22 +1553,22 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "kvdb-rocksdb"
-version = "0.1.3"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "elastic-array 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "fs-swap 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fs-swap 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "interleaved-ordered 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-rocksdb 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1588,7 +1592,7 @@ dependencies = [
 
 [[package]]
 name = "lazycell"
-version = "0.6.0"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1601,7 +1605,7 @@ name = "libloading"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1620,7 +1624,7 @@ name = "libusb-sys"
 version = "0.2.4"
 source = "git+https://github.com/paritytech/libusb-sys#14bdb698003731b6344a79e1d814704e44363e7c"
 dependencies = [
- "cc 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1658,12 +1662,12 @@ name = "log"
 version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "log"
-version = "0.4.4"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1742,8 +1746,8 @@ name = "migration-rocksdb"
 version = "0.1.0"
 dependencies = [
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "kvdb-rocksdb 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kvdb-rocksdb 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "macros 0.1.0",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1769,16 +1773,16 @@ dependencies = [
 
 [[package]]
 name = "mio"
-version = "0.6.15"
+version = "0.6.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazycell 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazycell 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1788,22 +1792,22 @@ dependencies = [
 [[package]]
 name = "mio-named-pipes"
 version = "0.1.6"
-source = "git+https://github.com/alexcrichton/mio-named-pipes#57a6298769fce2c66531d4085bdaf8c48ce64bce"
+source = "git+https://github.com/alexcrichton/mio-named-pipes#2072ae0de5b3632dbb065fcd9c8be6c6a2fc39ae"
 dependencies = [
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "miow 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "mio-uds"
-version = "0.6.6"
+version = "0.6.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1822,7 +1826,7 @@ name = "miow"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "socket2 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "socket2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1871,9 +1875,9 @@ dependencies = [
  "ethcore-network-devp2p 1.12.0",
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb-memorydb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "lru-cache 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1900,7 +1904,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1966,11 +1970,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "ordered-float"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "num-traits 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "unreachable 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2002,9 +2006,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "parity-clib"
 version = "1.12.0"
 dependencies = [
- "jni 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "jni 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "panic_hook 0.1.0",
- "parity-ethereum 2.1.0",
+ "parity-ethereum 2.1.6",
 ]
 
 [[package]]
@@ -2020,7 +2024,7 @@ dependencies = [
 
 [[package]]
 name = "parity-ethereum"
-version = "2.1.0"
+version = "2.1.6"
 dependencies = [
  "ansi_term 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2046,15 +2050,15 @@ dependencies = [
  "ethkey 0.3.0",
  "fake-fetch 0.0.1",
  "fdlimit 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipnetwork 0.12.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "journaldb 0.2.0",
  "jsonrpc-core 8.0.1 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "kvdb-rocksdb 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kvdb-rocksdb 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "mem 0.1.0",
  "migration-rocksdb 0.1.0",
  "node-filter 1.12.0",
@@ -2070,9 +2074,9 @@ dependencies = [
  "parity-rpc 1.12.0",
  "parity-rpc-client 1.4.0",
  "parity-updater 1.12.0",
- "parity-version 2.1.0",
+ "parity-version 2.1.6",
  "parity-whisper 0.1.0",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "pretty_assertions 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "registrar 0.0.1",
@@ -2082,9 +2086,9 @@ dependencies = [
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "term_size 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "textwrap 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2102,16 +2106,16 @@ dependencies = [
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "fake-fetch 0.0.1",
  "fetch 0.1.0",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "mime 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "mime_guess 2.0.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-reactor 0.1.0",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "registrar 0.0.1",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2142,11 +2146,11 @@ dependencies = [
  "ethkey 0.3.0",
  "kvdb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb-memorydb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2165,7 +2169,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "parity-reactor"
 version = "0.1.0"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2176,12 +2180,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "local-encoding 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parity-rocksdb-sys 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parity-rocksdb-sys 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "parity-rocksdb-sys"
-version = "0.5.2"
+version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cmake 0.1.33 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2215,7 +2219,7 @@ dependencies = [
  "fake-hardware-wallet 0.0.1",
  "fastmap 0.1.0",
  "fetch 0.1.0",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "hardware-wallet 1.12.0",
  "itertools 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2227,7 +2231,7 @@ dependencies = [
  "jsonrpc-ws-server 8.0.0 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb-memorydb 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "macros 0.1.0",
  "multihash 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "order-stat 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2235,17 +2239,17 @@ dependencies = [
  "parity-crypto 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-reactor 0.1.0",
  "parity-updater 1.12.0",
- "parity-version 2.1.0",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "patricia-trie 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parity-version 2.1.6",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "patricia-trie 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "pretty_assertions 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "stats 0.1.0",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2259,16 +2263,16 @@ dependencies = [
 name = "parity-rpc-client"
 version = "1.4.0"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-core 8.0.1 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "jsonrpc-ws-server 8.0.0 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-rpc 1.12.0",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2293,11 +2297,11 @@ dependencies = [
 [[package]]
 name = "parity-tokio-ipc"
 version = "0.1.5"
-source = "git+https://github.com/nikvolf/parity-tokio-ipc#c0f80b40399d7f08ef1e6869569640eb28645f56"
+source = "git+https://github.com/nikvolf/parity-tokio-ipc?rev=c0f80b40399d7f08ef1e6869569640eb28645f56#c0f80b40399d7f08ef1e6869569640eb28645f56"
 dependencies = [
- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio-named-pipes 0.1.6 (git+https://github.com/alexcrichton/mio-named-pipes)",
  "miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2320,13 +2324,13 @@ dependencies = [
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-hash-fetch 1.12.0",
  "parity-path 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "parity-version 2.1.0",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parity-version 2.1.6",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "target_info 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2335,7 +2339,7 @@ dependencies = [
 
 [[package]]
 name = "parity-version"
-version = "2.1.0"
+version = "2.1.6"
 dependencies = [
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2366,16 +2370,16 @@ dependencies = [
  "jsonrpc-core 8.0.1 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "jsonrpc-macros 8.0.0 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
  "jsonrpc-pubsub 8.0.0 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "mem 0.1.0",
- "ordered-float 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ordered-float 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-crypto 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "tiny-keccak 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2393,22 +2397,23 @@ dependencies = [
 
 [[package]]
 name = "parking_lot"
-version = "0.6.3"
+version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lock_api 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot_core 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "parking_lot_core"
-version = "0.2.14"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "petgraph 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread-id 3.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2416,7 +2421,7 @@ dependencies = [
 
 [[package]]
 name = "patricia-trie"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "elastic-array 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2437,7 +2442,7 @@ dependencies = [
  "keccak-hasher 0.1.1",
  "memorydb 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "patricia-trie 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "patricia-trie 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2512,12 +2517,12 @@ version = "1.12.0"
 dependencies = [
  "fake-fetch 0.0.1",
  "fetch 0.1.0",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.11.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2580,7 +2585,7 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "0.4.13"
+version = "0.4.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2608,9 +2613,9 @@ dependencies = [
  "ethereum-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethjson 0.1.0",
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "vm 0.1.0",
  "wasm 0.1.0",
 ]
@@ -2621,7 +2626,7 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-wasm 0.31.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2651,7 +2656,7 @@ name = "quote"
 version = "0.6.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2739,7 +2744,7 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "aho-corasick 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2772,7 +2777,7 @@ dependencies = [
  "ethabi 5.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethabi-contract 5.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethabi-derive 5.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hash 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2781,7 +2786,7 @@ name = "relay"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2797,7 +2802,7 @@ name = "ring"
 version = "0.12.1"
 source = "git+https://github.com/paritytech/ring#bae475e9f7ea7dd4ae671bef4b576089a9b06731"
 dependencies = [
- "cc 1.0.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2849,7 +2854,7 @@ dependencies = [
 name = "rpc-cli"
 version = "1.4.0"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-rpc 1.12.0",
  "parity-rpc-client 1.4.0",
  "rpassword 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2965,17 +2970,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.75"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde_derive"
-version = "1.0.75"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.14.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2983,17 +2988,17 @@ name = "serde_ignored"
 version = "0.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.26"
+version = "1.0.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "itoa 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ryu 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3067,7 +3072,7 @@ dependencies = [
 
 [[package]]
 name = "socket2"
-version = "0.3.7"
+version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3085,7 +3090,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "stats"
 version = "0.1.0"
 dependencies = [
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3124,10 +3129,10 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "0.14.9"
+version = "0.15.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -3175,7 +3180,7 @@ dependencies = [
 
 [[package]]
 name = "termcolor"
-version = "1.0.2"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "wincolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3264,14 +3269,14 @@ name = "tokio"
 version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-current-thread 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-fs 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-reactor 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tcp 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-threadpool 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-timer 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3284,8 +3289,8 @@ name = "tokio-codec"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -3294,16 +3299,16 @@ name = "tokio-core"
 version = "0.1.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "scoped-tls 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-reactor 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-timer 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -3312,7 +3317,7 @@ name = "tokio-current-thread"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -3321,7 +3326,7 @@ name = "tokio-executor"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3329,7 +3334,7 @@ name = "tokio-fs"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-threadpool 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -3339,9 +3344,9 @@ name = "tokio-io"
 version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3349,8 +3354,8 @@ name = "tokio-named-pipes"
 version = "0.1.0"
 source = "git+https://github.com/nikvolf/tokio-named-pipes#0b9b728eaeb0a6673c287ac7692be398fd651752"
 dependencies = [
- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio-named-pipes 0.1.6 (git+https://github.com/alexcrichton/mio-named-pipes)",
  "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3361,7 +3366,7 @@ name = "tokio-proto"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3375,16 +3380,16 @@ dependencies = [
 
 [[package]]
 name = "tokio-reactor"
-version = "0.1.4"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3395,7 +3400,7 @@ name = "tokio-retry"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3406,7 +3411,7 @@ name = "tokio-rustls"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustls 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-proto 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3417,7 +3422,7 @@ name = "tokio-service"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3425,12 +3430,12 @@ name = "tokio-tcp"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-reactor 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3440,8 +3445,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crossbeam-deque 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3452,7 +3457,7 @@ name = "tokio-timer"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -3462,7 +3467,7 @@ version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -3472,13 +3477,13 @@ name = "tokio-udp"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-reactor 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3486,13 +3491,13 @@ name = "tokio-uds"
 version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
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  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio-uds 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-core 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -3502,15 +3507,15 @@ name = "tokio-uds"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio-uds 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-reactor 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3518,7 +3523,7 @@ name = "toml"
 version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3526,7 +3531,7 @@ name = "trace-time"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3535,7 +3540,7 @@ version = "1.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
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 ]
@@ -3652,14 +3657,6 @@ name = "unicode-xid"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "unreachable"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "unreachable"
 version = "1.0.0"
@@ -3720,9 +3717,9 @@ dependencies = [
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- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
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- "patricia-trie 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "patricia-trie 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
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 ]
@@ -3747,8 +3744,8 @@ name = "want"
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 dependencies = [
- "futures 0.1.23 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "try-lock 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -3760,7 +3757,7 @@ dependencies = [
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  "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
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  "pwasm-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "vm 0.1.0",
@@ -3807,11 +3804,11 @@ dependencies = [
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- "log 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
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- "serde_derive 1.0.75 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.78 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3866,10 +3863,10 @@ version = "0.7.5"
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 dependencies = [
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- "bytes 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
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- "mio 0.6.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
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  "sha1 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -3928,8 +3925,8 @@ dependencies = [
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 "checksum cesu8 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "6d43a04d8753f35258c91f8ec639f792891f748a1edbd759cf1dcea3382ad83c"
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@@ -3937,7 +3934,7 @@ dependencies = [
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@@ -3969,10 +3966,10 @@ dependencies = [
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@@ -3995,8 +3992,8 @@ dependencies = [
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 "checksum jsonrpc-http-server 8.0.0 (git+https://github.com/paritytech/jsonrpc.git?branch=parity-1.11)" = "<none>"
@@ -4010,11 +4007,11 @@ dependencies = [
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 "checksum libusb 0.3.0 (git+https://github.com/paritytech/libusb-rs)" = "<none>"
@@ -4024,7 +4021,7 @@ dependencies = [
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 "checksum url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2a321979c09843d272956e73700d12c4e7d3d92b2ee112b31548aef0d4efc5a6"
diff --git a/Cargo.toml b/Cargo.toml
index 2cec37067b1..989cf31e4eb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 description = "Parity Ethereum client"
 name = "parity-ethereum"
 # NOTE Make sure to update util/version/Cargo.toml as well
-version = "2.1.0"
+version = "2.1.6"
 license = "GPL-3.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 
diff --git a/README.md b/README.md
index 291b4b3746d..d72e5bc3edc 100644
--- a/README.md
+++ b/README.md
@@ -4,9 +4,7 @@
 
 <p align="center"><strong><a href="https://github.com/paritytech/parity-ethereum/releases/latest">» Download the latest release «</a></strong></p>
 
-<p align="center"><a href="https://gitlab.parity.io/parity/parity/commits/master" target="_blank"><img src="https://gitlab.parity.io/parity/parity/badges/master/build.svg" /></a>
-<a href="https://codecov.io/gh/paritytech/parity-ethereum" target="_blank"><img src="https://codecov.io/gh/paritytech/parity-ethereum/branch/master/graph/badge.svg" /></a>
-<a href="https://build.snapcraft.io/user/paritytech/parity" target="_blank"><img src="https://build.snapcraft.io/badge/paritytech/parity.svg" /></a>
+<p align="center"><a href="https://gitlab.parity.io/parity/parity-ethereum/commits/master" target="_blank"><img src="https://gitlab.parity.io/parity/parity-ethereum/badges/master/build.svg" /></a>
 <a href="https://www.gnu.org/licenses/gpl-3.0.en.html" target="_blank"><img src="https://img.shields.io/badge/license-GPL%20v3-green.svg" /></a></p>
 
 **Built for mission-critical use**: Miners, service providers, and exchanges need fast synchronisation and maximum uptime. Parity Ethereum provides the core infrastructure essential for speedy and reliable services.
@@ -25,11 +23,11 @@ By default, Parity Ethereum runs a JSON-RPC HTTP server on port `:8545` and a We
 
 If you run into problems while using Parity Ethereum, check out the [wiki for documentation](https://wiki.parity.io/), feel free to [file an issue in this repository](https://github.com/paritytech/parity-ethereum/issues/new), or hop on our [Gitter](https://gitter.im/paritytech/parity) or [Riot](https://riot.im/app/#/group/+parity:matrix.parity.io) chat room to ask a question. We are glad to help! **For security-critical issues**, please refer to the security policy outlined in [SECURITY.md](SECURITY.md).
 
-Parity Ethereum's current beta-release is 2.0. You can download it at [the releases page](https://github.com/paritytech/parity-ethereum/releases) or follow the instructions below to build from source. Please, mind the [CHANGELOG.md](CHANGELOG.md) for a list of all changes between different versions.
+Parity Ethereum's current beta-release is 2.1. You can download it at [the releases page](https://github.com/paritytech/parity-ethereum/releases) or follow the instructions below to build from source. Please, mind the [CHANGELOG.md](CHANGELOG.md) for a list of all changes between different versions.
 
 ## Build Dependencies
 
-Parity Ethereum requires **Rust version 1.28.x** to build.
+Parity Ethereum requires **Rust version 1.29.x** to build.
 
 We recommend installing Rust through [rustup](https://www.rustup.rs/). If you don't already have `rustup`, you can install it like this:
 
@@ -60,26 +58,6 @@ Once you have `rustup` installed, then you need to install:
 
 Make sure that these binaries are in your `PATH`. After that, you should be able to build Parity Ethereum from source.
 
-## Install from the Snapcraft Store
-
-In any of the [supported Linux distros](https://snapcraft.io/docs/core/install):
-
-```bash
-sudo snap install parity
-```
-
-Alternatively, if you want to contribute testing the upcoming release:
-
-```bash
-sudo snap install parity --beta
-```
-
-Moreover, to test the latest code from the master branch:
-
-```bash
-sudo snap install parity --edge
-```
-
 ## Build from Source Code
 
 ```bash
diff --git a/docker/android/Dockerfile b/docker/android/Dockerfile
deleted file mode 100644
index 1dbf15fac7d..00000000000
--- a/docker/android/Dockerfile
+++ /dev/null
@@ -1,61 +0,0 @@
-FROM ubuntu:xenial
-LABEL maintainer="Parity Technologies <devops@parity.io>"
-
-RUN apt-get update && \
-    apt-get install -yq sudo curl file build-essential wget git g++ cmake pkg-config bison flex \
-                        unzip lib32stdc++6 lib32z1 python autotools-dev automake autoconf libtool \
-                        gperf xsltproc docbook-xsl
-
-# Rust & Cargo
-RUN curl https://sh.rustup.rs -sSf | sh -s -- -y
-ENV PATH /root/.cargo/bin:$PATH
-RUN rustup toolchain install stable
-RUN rustup target add --toolchain stable arm-linux-androideabi
-RUN rustup target add --toolchain stable armv7-linux-androideabi
-
-# Android NDK and toolchain
-RUN cd /usr/local && \
-    wget -q https://dl.google.com/android/repository/android-ndk-r16b-linux-x86_64.zip && \
-    unzip -q android-ndk-r16b-linux-x86_64.zip && \
-    rm android-ndk-r16b-linux-x86_64.zip
-ENV NDK_HOME /usr/local/android-ndk-r16b
-RUN /usr/local/android-ndk-r16b/build/tools/make-standalone-toolchain.sh \
-    --arch=arm --install-dir=/opt/ndk-standalone --stl=libc++ --platform=android-26
-ENV PATH $PATH:/opt/ndk-standalone/bin
-
-# Compiling libudev for Android
-# This is the most hacky part of the process, as we need to apply a patch and pass specific
-# options that the compiler environment doesn't define.
-RUN cd /root && \
-    git clone https://github.com/gentoo/eudev.git
-ADD libudev.patch /root
-RUN cd /root/eudev && \
-    git checkout 83d918449f22720d84a341a05e24b6d109e6d3ae && \
-    ./autogen.sh && \
-    ./configure --disable-introspection --disable-programs --disable-hwdb \
-                --host=arm-linux-androideabi --prefix=/opt/ndk-standalone/sysroot/usr/ \
-                --enable-shared=false CC=arm-linux-androideabi-clang \
-                CFLAGS="-D LINE_MAX=2048 -D RLIMIT_NLIMITS=15 -D IPTOS_LOWCOST=2 -std=gnu99" \
-                CXX=arm-linux-androideabi-clang++ && \
-    git apply - < /root/libudev.patch && \
-    make && \
-    make install
-RUN rm -rf /root/eudev
-RUN rm /root/libudev.patch
-
-# Rust-related configuration
-ADD cargo-config.toml /root/.cargo/config
-ENV ARM_LINUX_ANDROIDEABI_OPENSSL_DIR /opt/ndk-standalone/sysroot/usr
-ENV ARMV7_LINUX_ANDROIDEABI_OPENSSL_DIR /opt/ndk-standalone/sysroot/usr
-ENV CC_arm_linux_androideabi arm-linux-androideabi-clang
-ENV CC_armv7_linux_androideabi arm-linux-androideabi-clang
-ENV CXX_arm_linux_androideabi arm-linux-androideabi-clang++
-ENV CXX_armv7_linux_androideabi arm-linux-androideabi-clang++
-ENV AR_arm_linux_androideabi arm-linux-androideabi-ar
-ENV AR_armv7_linux_androideabi arm-linux-androideabi-ar
-ENV CFLAGS_arm_linux_androideabi -std=gnu11 -fPIC -D OS_ANDROID
-ENV CFLAGS_armv7_linux_androideabi -std=gnu11 -fPIC -D OS_ANDROID
-ENV CXXFLAGS_arm_linux_androideabi -std=gnu++11 -fPIC -fexceptions -frtti -static-libstdc++ -D OS_ANDROID
-ENV CXXFLAGS_armv7_linux_androideabi -std=gnu++11 -fPIC -fexceptions -frtti -static-libstdc++ -D OS_ANDROID
-ENV CXXSTDLIB_arm_linux_androideabi ""
-ENV CXXSTDLIB_armv7_linux_androideabi ""
diff --git a/docker/android/cargo-config.toml b/docker/android/cargo-config.toml
deleted file mode 100644
index 7373a7e143d..00000000000
--- a/docker/android/cargo-config.toml
+++ /dev/null
@@ -1,9 +0,0 @@
-[target.armv7-linux-androideabi]
-linker = "arm-linux-androideabi-clang"
-ar = "arm-linux-androideabi-ar"
-rustflags = ["-C", "link-arg=-lc++_static", "-C", "link-arg=-lc++abi", "-C", "link-arg=-landroid_support"]
-
-[target.arm-linux-androideabi]
-linker = "arm-linux-androideabi-clang"
-ar = "arm-linux-androideabi-ar"
-rustflags = ["-C", "link-arg=-lc++_static", "-C", "link-arg=-lc++abi", "-C", "link-arg=-landroid_support"]
diff --git a/docker/android/libudev.patch b/docker/android/libudev.patch
deleted file mode 100644
index ba7e849b2e6..00000000000
--- a/docker/android/libudev.patch
+++ /dev/null
@@ -1,216 +0,0 @@
-diff --git a/src/collect/collect.c b/src/collect/collect.c
-index 2cf1f00..b24f26b 100644
---- a/src/collect/collect.c
-+++ b/src/collect/collect.c
-@@ -84,7 +84,7 @@ static void usage(void)
-                "  invoked for each ID in <idlist>) collect returns 0, the\n"
-                "  number of missing IDs otherwise.\n"
-                "  On error a negative number is returned.\n\n"
--               , program_invocation_short_name);
-+               , "parity");
- }
- 
- /*
-diff --git a/src/scsi_id/scsi_id.c b/src/scsi_id/scsi_id.c
-index 8b76d87..7bf3948 100644
---- a/src/scsi_id/scsi_id.c
-+++ b/src/scsi_id/scsi_id.c
-@@ -321,7 +321,7 @@ static void help(void) {
-                "  -u --replace-whitespace          Replace all whitespace by underscores\n"
-                "  -v --verbose                     Verbose logging\n"
-                "  -x --export                      Print values as environment keys\n"
--               , program_invocation_short_name);
-+               , "parity");
- 
- }
- 
-diff --git a/src/shared/hashmap.h b/src/shared/hashmap.h
-index a03ee58..a7c2005 100644
---- a/src/shared/hashmap.h
-+++ b/src/shared/hashmap.h
-@@ -98,10 +98,7 @@ extern const struct hash_ops uint64_hash_ops;
- #if SIZEOF_DEV_T != 8
- unsigned long devt_hash_func(const void *p, const uint8_t hash_key[HASH_KEY_SIZE]) _pure_;
- int devt_compare_func(const void *a, const void *b) _pure_;
--extern const struct hash_ops devt_hash_ops = {
--        .hash = devt_hash_func,
--        .compare = devt_compare_func
--};
-+extern const struct hash_ops devt_hash_ops;
- #else
- #define devt_hash_func uint64_hash_func
- #define devt_compare_func uint64_compare_func
-diff --git a/src/shared/log.c b/src/shared/log.c
-index 4a40996..1496984 100644
---- a/src/shared/log.c
-+++ b/src/shared/log.c
-@@ -335,7 +335,7 @@ static int write_to_syslog(
- 
-         IOVEC_SET_STRING(iovec[0], header_priority);
-         IOVEC_SET_STRING(iovec[1], header_time);
--        IOVEC_SET_STRING(iovec[2], program_invocation_short_name);
-+        IOVEC_SET_STRING(iovec[2], "parity");
-         IOVEC_SET_STRING(iovec[3], header_pid);
-         IOVEC_SET_STRING(iovec[4], buffer);
- 
-@@ -383,7 +383,7 @@ static int write_to_kmsg(
-         char_array_0(header_pid);
- 
-         IOVEC_SET_STRING(iovec[0], header_priority);
--        IOVEC_SET_STRING(iovec[1], program_invocation_short_name);
-+        IOVEC_SET_STRING(iovec[1], "parity");
-         IOVEC_SET_STRING(iovec[2], header_pid);
-         IOVEC_SET_STRING(iovec[3], buffer);
-         IOVEC_SET_STRING(iovec[4], "\n");
-diff --git a/src/udev/udevadm-control.c b/src/udev/udevadm-control.c
-index 6af7163..3271e56 100644
---- a/src/udev/udevadm-control.c
-+++ b/src/udev/udevadm-control.c
-@@ -41,7 +41,7 @@ static void print_help(void) {
-                "  -p --property=KEY=VALUE  Set a global property for all events\n"
-                "  -m --children-max=N      Maximum number of children\n"
-                "     --timeout=SECONDS     Maximum time to block for a reply\n"
--               , program_invocation_short_name);
-+               , "parity");
- }
- 
- static int adm_control(struct udev *udev, int argc, char *argv[]) {
-diff --git a/src/udev/udevadm-info.c b/src/udev/udevadm-info.c
-index 0aec976..a31ac02 100644
---- a/src/udev/udevadm-info.c
-+++ b/src/udev/udevadm-info.c
-@@ -279,7 +279,7 @@ static void help(void) {
-                "  -P --export-prefix          Export the key name with a prefix\n"
-                "  -e --export-db              Export the content of the udev database\n"
-                "  -c --cleanup-db             Clean up the udev database\n"
--               , program_invocation_short_name);
-+               , "parity");
- }
- 
- static int uinfo(struct udev *udev, int argc, char *argv[]) {
-diff --git a/src/udev/udevadm-monitor.c b/src/udev/udevadm-monitor.c
-index 15ded09..b58dd08 100644
---- a/src/udev/udevadm-monitor.c
-+++ b/src/udev/udevadm-monitor.c
-@@ -73,7 +73,7 @@ static void help(void) {
-                "  -u --udev                                Print udev events\n"
-                "  -s --subsystem-match=SUBSYSTEM[/DEVTYPE] Filter events by subsystem\n"
-                "  -t --tag-match=TAG                       Filter events by tag\n"
--               , program_invocation_short_name);
-+               , "parity");
- }
- 
- static int adm_monitor(struct udev *udev, int argc, char *argv[]) {
-diff --git a/src/udev/udevadm-settle.c b/src/udev/udevadm-settle.c
-index 33597bc..b36a504 100644
---- a/src/udev/udevadm-settle.c
-+++ b/src/udev/udevadm-settle.c
-@@ -43,7 +43,7 @@ static void help(void) {
-                "     --version              Show package version\n"
-                "  -t --timeout=SECONDS      Maximum time to wait for events\n"
-                "  -E --exit-if-exists=FILE  Stop waiting if file exists\n"
--               , program_invocation_short_name);
-+               , "parity");
- }
- 
- static int adm_settle(struct udev *udev, int argc, char *argv[]) {
-diff --git a/src/udev/udevadm-test-builtin.c b/src/udev/udevadm-test-builtin.c
-index baaeca9..50ed812 100644
---- a/src/udev/udevadm-test-builtin.c
-+++ b/src/udev/udevadm-test-builtin.c
-@@ -39,7 +39,7 @@ static void help(struct udev *udev) {
-                "  -h --help     Print this message\n"
-                "     --version  Print version of the program\n\n"
-                "Commands:\n"
--               , program_invocation_short_name);
-+               , "parity");
- 
-         udev_builtin_list(udev);
- }
-diff --git a/src/udev/udevadm-test.c b/src/udev/udevadm-test.c
-index 47fd924..a855412 100644
---- a/src/udev/udevadm-test.c
-+++ b/src/udev/udevadm-test.c
-@@ -39,7 +39,7 @@ static void help(void) {
-                "     --version                         Show package version\n"
-                "  -a --action=ACTION                   Set action string\n"
-                "  -N --resolve-names=early|late|never  When to resolve names\n"
--               , program_invocation_short_name);
-+               , "parity");
- }
- 
- static int adm_test(struct udev *udev, int argc, char *argv[]) {
-diff --git a/src/udev/udevadm-trigger.c b/src/udev/udevadm-trigger.c
-index 4dc756a..67787d3 100644
---- a/src/udev/udevadm-trigger.c
-+++ b/src/udev/udevadm-trigger.c
-@@ -92,7 +92,7 @@ static void help(void) {
-                "  -y --sysname-match=NAME           Trigger devices with this /sys path\n"
-                "     --name-match=NAME              Trigger devices with this /dev name\n"
-                "  -b --parent-match=NAME            Trigger devices with that parent device\n"
--               , program_invocation_short_name);
-+               , "parity");
- }
- 
- static int adm_trigger(struct udev *udev, int argc, char *argv[]) {
-diff --git a/src/udev/udevadm.c b/src/udev/udevadm.c
-index 3e57cf6..b03dfaa 100644
---- a/src/udev/udevadm.c
-+++ b/src/udev/udevadm.c
-@@ -62,7 +62,7 @@ static int adm_help(struct udev *udev, int argc, char *argv[]) {
-         printf("%s [--help] [--version] [--debug] COMMAND [COMMAND OPTIONS]\n\n"
-                "Send control commands or test the device manager.\n\n"
-                "Commands:\n"
--               , program_invocation_short_name);
-+               , "parity");
- 
-         for (i = 0; i < ELEMENTSOF(udevadm_cmds); i++)
-                 if (udevadm_cmds[i]->help != NULL)
-@@ -128,7 +128,7 @@ int main(int argc, char *argv[]) {
-                                 goto out;
-                         }
- 
--        fprintf(stderr, "%s: missing or unknown command\n", program_invocation_short_name);
-+        fprintf(stderr, "%s: missing or unknown command\n", "parity");
-         rc = 2;
- out:
-         mac_selinux_finish();
-diff --git a/src/udev/udevd.c b/src/udev/udevd.c
-index cf826c6..4eec0af 100644
---- a/src/udev/udevd.c
-+++ b/src/udev/udevd.c
-@@ -1041,7 +1041,7 @@ static void help(void) {
-                "  -t --event-timeout=SECONDS  Seconds to wait before terminating an event\n"
-                "  -N --resolve-names=early|late|never\n"
-                "                              When to resolve users and groups\n"
--               , program_invocation_short_name);
-+               , "parity");
- }
- 
- static int parse_argv(int argc, char *argv[]) {
-diff --git a/src/v4l_id/v4l_id.c b/src/v4l_id/v4l_id.c
-index 1dce0d5..f65badf 100644
---- a/src/v4l_id/v4l_id.c
-+++ b/src/v4l_id/v4l_id.c
-@@ -49,7 +49,7 @@ int main(int argc, char *argv[]) {
-                         printf("%s [-h,--help] <device file>\n\n"
-                                "Video4Linux device identification.\n\n"
-                                "  -h  Print this message\n"
--                               , program_invocation_short_name);
-+                               , "parity");
-                         return 0;
-                 case '?':
-                         return -EINVAL;
-diff --git a/src/shared/path-util.c b/src/shared/path-util.c
-index 0744563..7151356 100644
---- a/src/shared/path-util.c
-+++ b/src/shared/path-util.c
-@@ -109,7 +109,7 @@ char *path_make_absolute_cwd(const char *p) {
-         if (path_is_absolute(p))
-                 return strdup(p);
- 
--        cwd = get_current_dir_name();
-+        cwd = getcwd(malloc(128), 128);
-         if (!cwd)
-                 return NULL;
- 
diff --git a/ethcore/Cargo.toml b/ethcore/Cargo.toml
index c5c21dffe55..098eb5f1763 100644
--- a/ethcore/Cargo.toml
+++ b/ethcore/Cargo.toml
@@ -18,7 +18,7 @@ ethcore-bloom-journal = { path = "../util/bloom" }
 parity-bytes = "0.1"
 hashdb = "0.2.1"
 memorydb = "0.2.1"
-patricia-trie = "0.2.1"
+patricia-trie = "0.2"
 patricia-trie-ethereum = { path = "../util/patricia-trie-ethereum" }
 parity-crypto = "0.1"
 error-chain = { version = "0.12", default-features = false }
diff --git a/ethcore/evm/src/interpreter/gasometer.rs b/ethcore/evm/src/interpreter/gasometer.rs
index 406df19fd35..60ea30da042 100644
--- a/ethcore/evm/src/interpreter/gasometer.rs
+++ b/ethcore/evm/src/interpreter/gasometer.rs
@@ -176,9 +176,8 @@ impl<Gas: evm::CostType> Gasometer<Gas> {
 				Request::GasMem(default_gas, mem_needed(stack.peek(0), stack.peek(1))?)
 			},
 			instructions::SHA3 => {
-				let w = overflowing!(add_gas_usize(Gas::from_u256(*stack.peek(1))?, 31));
-				let words = w >> 5;
-				let gas = Gas::from(schedule.sha3_gas) + (Gas::from(schedule.sha3_word_gas) * words);
+				let words = overflowing!(to_word_size(Gas::from_u256(*stack.peek(1))?));
+				let gas = overflowing!(Gas::from(schedule.sha3_gas).overflow_add(overflowing!(Gas::from(schedule.sha3_word_gas).overflow_mul(words))));
 				Request::GasMem(gas, mem_needed(stack.peek(0), stack.peek(1))?)
 			},
 			instructions::CALLDATACOPY | instructions::CODECOPY | instructions::RETURNDATACOPY => {
@@ -231,13 +230,24 @@ impl<Gas: evm::CostType> Gasometer<Gas> {
 
 				Request::GasMemProvide(gas, mem, Some(requested))
 			},
-			instructions::CREATE | instructions::CREATE2 => {
+			instructions::CREATE => {
+				let start = stack.peek(1);
+				let len = stack.peek(2);
+
 				let gas = Gas::from(schedule.create_gas);
-				let mem = match instruction {
-					instructions::CREATE => mem_needed(stack.peek(1), stack.peek(2))?,
-					instructions::CREATE2 => mem_needed(stack.peek(2), stack.peek(3))?,
-					_ => unreachable!("instruction can only be CREATE/CREATE2 checked above; qed"),
-				};
+				let mem = mem_needed(start, len)?;
+
+				Request::GasMemProvide(gas, mem, None)
+			},
+			instructions::CREATE2 => {
+				let start = stack.peek(1);
+				let len = stack.peek(2);
+
+				let base = Gas::from(schedule.create_gas);
+				let word = overflowing!(to_word_size(Gas::from_u256(*len)?));
+				let word_gas = overflowing!(Gas::from(schedule.sha3_word_gas).overflow_mul(word));
+				let gas = overflowing!(base.overflow_add(word_gas));
+				let mem = mem_needed(start, len)?;
 
 				Request::GasMemProvide(gas, mem, None)
 			},
@@ -287,8 +297,8 @@ impl<Gas: evm::CostType> Gasometer<Gas> {
 			},
 			Request::GasMemCopy(gas, mem_size, copy) => {
 				let (mem_gas_cost, new_mem_gas, new_mem_size) = self.mem_gas_cost(schedule, current_mem_size, &mem_size)?;
-				let copy = overflowing!(add_gas_usize(copy, 31)) >> 5;
-				let copy_gas = Gas::from(schedule.copy_gas) * copy;
+				let copy = overflowing!(to_word_size(copy));
+				let copy_gas = overflowing!(Gas::from(schedule.copy_gas).overflow_mul(copy));
 				let gas = overflowing!(gas.overflow_add(copy_gas));
 				let gas = overflowing!(gas.overflow_add(mem_gas_cost));
 
@@ -315,7 +325,7 @@ impl<Gas: evm::CostType> Gasometer<Gas> {
 		};
 
 		let current_mem_size = Gas::from(current_mem_size);
-		let req_mem_size_rounded = (overflowing!(mem_size.overflow_add(Gas::from(31 as usize))) >> 5) << 5;
+		let req_mem_size_rounded = overflowing!(to_word_size(*mem_size)) << 5;
 
 		let (mem_gas_cost, new_mem_gas) = if req_mem_size_rounded > current_mem_size {
 			let new_mem_gas = gas_for_mem(req_mem_size_rounded)?;
@@ -347,6 +357,16 @@ fn add_gas_usize<Gas: evm::CostType>(value: Gas, num: usize) -> (Gas, bool) {
 	value.overflow_add(Gas::from(num))
 }
 
+#[inline]
+fn to_word_size<Gas: evm::CostType>(value: Gas) -> (Gas, bool) {
+	let (gas, overflow) = add_gas_usize(value, 31);
+	if overflow {
+		return (gas, overflow);
+	}
+
+	(gas >> 5, false)
+}
+
 #[inline]
 fn calculate_eip1283_sstore_gas<Gas: evm::CostType>(schedule: &Schedule, original: &U256, current: &U256, new: &U256) -> Gas {
 	Gas::from(
@@ -383,7 +403,7 @@ fn calculate_eip1283_sstore_gas<Gas: evm::CostType>(schedule: &Schedule, origina
 }
 
 pub fn handle_eip1283_sstore_clears_refund(ext: &mut vm::Ext, original: &U256, current: &U256, new: &U256) {
-	let sstore_clears_schedule = U256::from(ext.schedule().sstore_refund_gas);
+	let sstore_clears_schedule = ext.schedule().sstore_refund_gas;
 
 	if current == new {
 		// 1. If current value equals new value (this is a no-op), 200 gas is deducted.
@@ -418,11 +438,11 @@ pub fn handle_eip1283_sstore_clears_refund(ext: &mut vm::Ext, original: &U256, c
 				// 2.2.2. If original value equals new value (this storage slot is reset)
 				if original.is_zero() {
 					// 2.2.2.1. If original value is 0, add 19800 gas to refund counter.
-					let refund = U256::from(ext.schedule().sstore_set_gas - ext.schedule().sload_gas);
+					let refund = ext.schedule().sstore_set_gas - ext.schedule().sload_gas;
 					ext.add_sstore_refund(refund);
 				} else {
 					// 2.2.2.2. Otherwise, add 4800 gas to refund counter.
-					let refund = U256::from(ext.schedule().sstore_reset_gas - ext.schedule().sload_gas);
+					let refund = ext.schedule().sstore_reset_gas - ext.schedule().sload_gas;
 					ext.add_sstore_refund(refund);
 				}
 			}
diff --git a/ethcore/evm/src/interpreter/mod.rs b/ethcore/evm/src/interpreter/mod.rs
index 07d0f0c6294..8fd0dc32830 100644
--- a/ethcore/evm/src/interpreter/mod.rs
+++ b/ethcore/evm/src/interpreter/mod.rs
@@ -306,8 +306,7 @@ impl<Cost: CostType> Interpreter<Cost> {
 		match result {
 			InstructionResult::JumpToPosition(position) => {
 				if self.valid_jump_destinations.is_none() {
-					let code_hash = self.params.code_hash.clone().unwrap_or_else(|| keccak(self.reader.code.as_ref()));
-					self.valid_jump_destinations = Some(self.cache.jump_destinations(&code_hash, &self.reader.code));
+					self.valid_jump_destinations = Some(self.cache.jump_destinations(&self.params.code_hash, &self.reader.code));
 				}
 				let jump_destinations = self.valid_jump_destinations.as_ref().expect("jump_destinations are initialized on first jump; qed");
 				let pos = self.verify_jump(position, jump_destinations)?;
@@ -634,7 +633,7 @@ impl<Cost: CostType> Interpreter<Cost> {
 					gasometer::handle_eip1283_sstore_clears_refund(ext, &original_val, &current_val, &val);
 				} else {
 					if !current_val.is_zero() && val.is_zero() {
-						let sstore_clears_schedule = U256::from(ext.schedule().sstore_refund_gas);
+						let sstore_clears_schedule = ext.schedule().sstore_refund_gas;
 						ext.add_sstore_refund(sstore_clears_schedule);
 					}
 				}
diff --git a/ethcore/evm/src/interpreter/shared_cache.rs b/ethcore/evm/src/interpreter/shared_cache.rs
index f4a7f47f90f..63c4f507d82 100644
--- a/ethcore/evm/src/interpreter/shared_cache.rs
+++ b/ethcore/evm/src/interpreter/shared_cache.rs
@@ -50,17 +50,22 @@ impl SharedCache {
 	}
 
 	/// Get jump destinations bitmap for a contract.
-	pub fn jump_destinations(&self, code_hash: &H256, code: &[u8]) -> Arc<BitSet> {
-		if code_hash == &KECCAK_EMPTY {
-			return Self::find_jump_destinations(code);
-		}
+	pub fn jump_destinations(&self, code_hash: &Option<H256>, code: &[u8]) -> Arc<BitSet> {
+		if let Some(ref code_hash) = code_hash {
+			if code_hash == &KECCAK_EMPTY {
+				return Self::find_jump_destinations(code);
+			}
 
-		if let Some(d) = self.jump_destinations.lock().get_mut(code_hash) {
-			return d.0.clone();
+			if let Some(d) = self.jump_destinations.lock().get_mut(code_hash) {
+				return d.0.clone();
+			}
 		}
 
 		let d = Self::find_jump_destinations(code);
-		self.jump_destinations.lock().insert(code_hash.clone(), Bits(d.clone()));
+
+		if let Some(ref code_hash) = code_hash {
+			self.jump_destinations.lock().insert(*code_hash, Bits(d.clone()));
+		}
 
 		d
 	}
diff --git a/ethcore/evm/src/tests.rs b/ethcore/evm/src/tests.rs
index 9fd7bcd9023..2c8caa54171 100644
--- a/ethcore/evm/src/tests.rs
+++ b/ethcore/evm/src/tests.rs
@@ -716,7 +716,7 @@ fn test_jumps(factory: super::Factory) {
 		test_finalize(vm.exec(&mut ext)).unwrap()
 	};
 
-	assert_eq!(ext.sstore_clears, U256::from(ext.schedule().sstore_refund_gas));
+	assert_eq!(ext.sstore_clears, ext.schedule().sstore_refund_gas as i128);
 	assert_store(&ext, 0, "0000000000000000000000000000000000000000000000000000000000000000"); // 5!
 	assert_store(&ext, 1, "0000000000000000000000000000000000000000000000000000000000000078"); // 5!
 	assert_eq!(gas_left, U256::from(54_117));
diff --git a/ethcore/light/Cargo.toml b/ethcore/light/Cargo.toml
index e8968723120..6f28ebef2e8 100644
--- a/ethcore/light/Cargo.toml
+++ b/ethcore/light/Cargo.toml
@@ -13,7 +13,7 @@ parity-bytes = "0.1"
 ethcore-transaction = { path = "../transaction" }
 ethereum-types = "0.4"
 memorydb = "0.2.1"
-patricia-trie = "0.2.1"
+patricia-trie = "0.2"
 patricia-trie-ethereum = { path = "../../util/patricia-trie-ethereum" }
 ethcore-network = { path = "../../util/network" }
 ethcore-io = { path = "../../util/io" }
diff --git a/ethcore/private-tx/Cargo.toml b/ethcore/private-tx/Cargo.toml
index 9b65c12180a..ed098c182a1 100644
--- a/ethcore/private-tx/Cargo.toml
+++ b/ethcore/private-tx/Cargo.toml
@@ -26,7 +26,7 @@ heapsize = "0.4"
 keccak-hash = "0.1.2"
 log = "0.4"
 parking_lot = "0.6"
-patricia-trie = "0.2.1"
+patricia-trie = "0.2"
 patricia-trie-ethereum = { path = "../../util/patricia-trie-ethereum" }
 rand = "0.3"
 rlp = { version = "0.2.4", features = ["ethereum"] }
diff --git a/ethcore/res/ethereum/classic.json b/ethcore/res/ethereum/classic.json
index b4d15c6186d..a5b6dba8cd2 100644
--- a/ethcore/res/ethereum/classic.json
+++ b/ethcore/res/ethereum/classic.json
@@ -3068,17 +3068,18 @@
 		]
 	  },
 	"nodes": [
-		"enode://e809c4a2fec7daed400e5e28564e23693b23b2cc5a019b612505631bbe7b9ccf709c1796d2a3d29ef2b045f210caf51e3c4f5b6d3587d43ad5d6397526fa6179@174.112.32.157:30303",
-		"enode://6e538e7c1280f0a31ff08b382db5302480f775480b8e68f8febca0ceff81e4b19153c6f8bf60313b93bef2cc34d34e1df41317de0ce613a201d1660a788a03e2@52.206.67.235:30303",
+		"enode://efd48ad0879eeb7f9cb5e50f33f7bc21e805a72e90361f145baaa22dd75d111e7cd9c93f1b7060dcb30aa1b3e620269336dbf32339fea4c18925a4c15fe642df@18.205.66.229:30303",
 		"enode://5fbfb426fbb46f8b8c1bd3dd140f5b511da558cd37d60844b525909ab82e13a25ee722293c829e52cb65c2305b1637fa9a2ea4d6634a224d5f400bfe244ac0de@162.243.55.45:30303",
-		"enode://42d8f29d1db5f4b2947cd5c3d76c6d0d3697e6b9b3430c3d41e46b4bb77655433aeedc25d4b4ea9d8214b6a43008ba67199374a9b53633301bca0cd20c6928ab@104.155.176.151:30303",
-		"enode://814920f1ec9510aa9ea1c8f79d8b6e6a462045f09caa2ae4055b0f34f7416fca6facd3dd45f1cf1673c0209e0503f02776b8ff94020e98b6679a0dc561b4eba0@104.154.136.117:30303",
-		"enode://72e445f4e89c0f476d404bc40478b0df83a5b500d2d2e850e08eb1af0cd464ab86db6160d0fde64bd77d5f0d33507ae19035671b3c74fec126d6e28787669740@104.198.71.200:30303",
-		"enode://39abab9d2a41f53298c0c9dc6bbca57b0840c3ba9dccf42aa27316addc1b7e56ade32a0a9f7f52d6c5db4fe74d8824bcedfeaecf1a4e533cacb71cf8100a9442@144.76.238.49:30303",
-		"enode://f50e675a34f471af2438b921914b5f06499c7438f3146f6b8936f1faeb50b8a91d0d0c24fb05a66f05865cd58c24da3e664d0def806172ddd0d4c5bdbf37747e@144.76.238.49:30306",
-		"enode://83b33409349ffa25e150555f7b4f8deebc68f3d34d782129dc3c8ba07b880c209310a4191e1725f2f6bef59bce9452d821111eaa786deab08a7e6551fca41f4f@159.89.223.6:30303",
-		"enode://5cd218959f8263bc3721d7789070806b0adff1a0ed3f95ec886fb469f9362c7507e3b32b256550b9a7964a23a938e8d42d45a0c34b332bfebc54b29081e83b93@35.187.57.94:30303",
-		"enode://6dd3ac8147fa82e46837ec8c3223d69ac24bcdbab04b036a3705c14f3a02e968f7f1adfcdb002aacec2db46e625c04bf8b5a1f85bb2d40a479b3cc9d45a444af@104.237.131.102:30303"
+		"enode://6dd3ac8147fa82e46837ec8c3223d69ac24bcdbab04b036a3705c14f3a02e968f7f1adfcdb002aacec2db46e625c04bf8b5a1f85bb2d40a479b3cc9d45a444af@104.237.131.102:30303",
+		"enode://b9e893ea9cb4537f4fed154233005ae61b441cd0ecd980136138c304fefac194c25a16b73dac05fc66a4198d0c15dd0f33af99b411882c68a019dfa6bb703b9d@18.130.93.66:30303",
+		"enode://3fe9705a02487baea45c1ffebfa4d84819f5f1e68a0dbc18031553242a6a08e39499b61e361a52c2a92f9553efd63763f6fdd34692be0d4ba6823bb2fc346009@178.62.238.75:30303",
+		"enode://d50facc65e46bda6ff594b6e95491efa16e067de41ae96571d9f3cb853d538c44864496fa5e4df10115f02bbbaf47853f932e110a44c89227da7c30e96840596@188.166.163.187:30303",
+		"enode://a0d5c589dc02d008fe4237da9877a5f1daedee0227ab612677eabe323520f003eb5e311af335de9f7964c2092bbc2b3b7ab1cce5a074d8346959f0868b4e366e@46.101.78.44:30303",
+		"enode://c071d96b0c0f13006feae3977fb1b3c2f62caedf643df9a3655bc1b60f777f05e69a4e58bf3547bb299210092764c56df1e08380e91265baa845dca8bc0a71da@68.183.99.5:30303",
+		"enode://83b33409349ffa25e150555f7b4f8deebc68f3d34d782129dc3c8ba07b880c209310a4191e1725f2f6bef59bce9452d821111eaa786deab08a7e6551fca41f4f@206.189.68.191:30303",
+		"enode://0daae2a30f2c73b0b257746587136efb8e3479496f7ea1e943eeb9a663b72dd04582f699f7010ee02c57fc45d1f09568c20a9050ff937f9139e2973ddd98b87b@159.89.169.103:30303",
+		"enode://50808461dd73b3d70537e4c1e5fafd1132b3a90f998399af9205f8889987d62096d4e853813562dd43e7270a71c9d9d4e4dd73a534fdb22fbac98c389c1a7362@178.128.55.119:30303",
+		"enode://5cd218959f8263bc3721d7789070806b0adff1a0ed3f95ec886fb469f9362c7507e3b32b256550b9a7964a23a938e8d42d45a0c34b332bfebc54b29081e83b93@35.187.57.94:30303"
 	],
 	"accounts": {
 		"0000000000000000000000000000000000000001": { "builtin": { "name": "ecrecover", "pricing": { "linear": { "base": 3000, "word": 0 } } } },
diff --git a/ethcore/res/ethereum/constantinople_test.json b/ethcore/res/ethereum/constantinople_test.json
index 7b153d3f4bb..6169b743eff 100644
--- a/ethcore/res/ethereum/constantinople_test.json
+++ b/ethcore/res/ethereum/constantinople_test.json
@@ -1,16 +1,16 @@
 {
-	"name": "Byzantium (Test)",
+	"name": "Constantinople (test)",
 	"engine": {
 		"Ethash": {
 			"params": {
 				"minimumDifficulty": "0x020000",
 				"difficultyBoundDivisor": "0x0800",
 				"durationLimit": "0x0d",
-				"blockReward": "0x29A2241AF62C0000",
+				"blockReward": "0x1BC16D674EC80000",
 				"homesteadTransition": "0x0",
 				"eip100bTransition": "0x0",
 				"difficultyBombDelays": {
-					"0": 3000000
+					"0": 5000000
 				}
 			}
 		}
@@ -30,11 +30,13 @@
 		"eip161abcTransition": "0x0",
 		"eip161dTransition": "0x0",
 		"eip140Transition": "0x0",
-		"eip210Transition": "0x0",
 		"eip211Transition": "0x0",
 		"eip214Transition": "0x0",
 		"eip155Transition": "0x0",
 		"eip658Transition": "0x0",
+		"eip145Transition": "0x0",
+		"eip1014Transition": "0x0",
+		"eip1052Transition": "0x0",
 		"eip1283Transition": "0x0"
 	},
 	"genesis": {
diff --git a/ethcore/res/ethereum/eip210_test.json b/ethcore/res/ethereum/eip210_test.json
new file mode 100644
index 00000000000..9733e5d87ef
--- /dev/null
+++ b/ethcore/res/ethereum/eip210_test.json
@@ -0,0 +1,54 @@
+{
+	"name": "EIP210 (test)",
+	"engine": {
+		"Ethash": {
+			"params": {
+				"minimumDifficulty": "0x020000",
+				"difficultyBoundDivisor": "0x0800",
+				"durationLimit": "0x0d",
+				"blockReward": "0x4563918244F40000",
+				"homesteadTransition": "0x0"
+			}
+		}
+	},
+	"params": {
+		"gasLimitBoundDivisor": "0x0400",
+		"registrar" : "0xc6d9d2cd449a754c494264e1809c50e34d64562b",
+		"accountStartNonce": "0x00",
+		"maximumExtraDataSize": "0x20",
+		"minGasLimit": "0x1388",
+		"networkID" : "0x1",
+		"maxCodeSize": 24576,
+		"maxCodeSizeTransition": "0x0",
+		"eip98Transition": "0xffffffffffffffff",
+		"eip150Transition": "0x0",
+		"eip160Transition": "0x0",
+		"eip161abcTransition": "0x0",
+		"eip161dTransition": "0x0",
+		"eip210Transition": "0x0"
+	},
+	"genesis": {
+		"seal": {
+			"ethereum": {
+				"nonce": "0x0000000000000042",
+				"mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000"
+			}
+		},
+		"difficulty": "0x400000000",
+		"author": "0x0000000000000000000000000000000000000000",
+		"timestamp": "0x00",
+		"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+		"extraData": "0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa",
+		"gasLimit": "0x1388"
+	},
+	"accounts": {
+		"0000000000000000000000000000000000000001": { "balance": "1", "builtin": { "name": "ecrecover", "pricing": { "linear": { "base": 3000, "word": 0 } } } },
+		"0000000000000000000000000000000000000002": { "balance": "1", "builtin": { "name": "sha256", "pricing": { "linear": { "base": 60, "word": 12 } } } },
+		"0000000000000000000000000000000000000003": { "balance": "1", "builtin": { "name": "ripemd160", "pricing": { "linear": { "base": 600, "word": 120 } } } },
+		"0000000000000000000000000000000000000004": { "balance": "1", "builtin": { "name": "identity", "pricing": { "linear": { "base": 15, "word": 3 } } } },
+		"0000000000000000000000000000000000000005": { "builtin": { "name": "modexp", "activate_at": "0x00", "pricing": { "modexp": { "divisor": 100 } } } },
+		"0000000000000000000000000000000000000006": { "builtin": { "name": "alt_bn128_add", "activate_at": "0x00", "pricing": { "linear": { "base": 500, "word": 0 } } } },
+		"0000000000000000000000000000000000000007": { "builtin": { "name": "alt_bn128_mul", "activate_at": "0x00", "pricing": { "linear": { "base": 2000, "word": 0 } } } },
+		"0000000000000000000000000000000000000008": { "builtin": { "name": "alt_bn128_pairing", "activate_at": "0x00", "pricing": { "alt_bn128_pairing": { "base": 100000, "pair": 80000 } } } }
+	}
+}
diff --git a/ethcore/res/ethereum/foundation.json b/ethcore/res/ethereum/foundation.json
index 4b11041a84a..f80fe893465 100644
--- a/ethcore/res/ethereum/foundation.json
+++ b/ethcore/res/ethereum/foundation.json
@@ -177,8 +177,8 @@
 		"stateRoot": "0xd7f8974fb5ac78d9ac099b9ad5018bedc2ce0a72dad1827a1709da30580f0544"
 	},
 	"hardcodedSync": 	{
-    "header": "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",
-		"totalDifficulty": "6255555800944520547241",
+		"header": "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",
+		"totalDifficulty": "7128515864594819065361",
 		"CHTs": [
 			"0x0eb474b7721727204978e92e27d31cddff56471911e424a4c8271c35f9c982cc",
 			"0xe10e94515fb5ffb7ffa9bf50db4a959b3f50c2ff75e0b8bd5f5e038749e52a11",
@@ -3216,7 +3216,137 @@
 			"0xf344c0cf6516f0fa6617e48076726aefbdaaf5a31f67ad8199bc3f6e426bf904",
 			"0x3f3d2d33f36ba9009e9a72f3f5bbcb5df5392a19fc7afc8d37823aaf52b03477",
 			"0x346a89411f090d559ff90e670bf0a385b1b09f117fc9ffa18b09d3b6d5d8e45c",
-			"0x5bc5689e2b4572b8ceea472cc7827e22cbfd018920beebf5c5b25f65f5cd5357"
+			"0x5bc5689e2b4572b8ceea472cc7827e22cbfd018920beebf5c5b25f65f5cd5357",
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+			"0x561a95eb50c663462bb8af3aab336bd745b0571746b10fefa791bc11be777763",
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+			"0x454dc6bb2443509381e478f1836cb36808e2ecd1a9944072056c292b710072f4",
+			"0x0c80566f34a46477592560a883a9c01fa393f7a2c9dbb28a54e46a5c017e8596",
+			"0xeff6a1255090509eccfdea2e591516886c91191f1f02eaae4808ac95009086fc",
+			"0x37cf60888e5ec75841e7f0533feef7200185a1c9f3253073216d83923c864829",
+			"0xb169ebb9e418809a96529835bc293782e4fc6310dba450afe3e95a7abdf7cc01",
+			"0xa3c8d5c71ce0477a247f56bfe95272ea07f0b7f10a8526b6e3ff9a8de8faa9ab",
+			"0x2bf18db4ee84bafbbabaf05d1d4d383c0d5fc91be6ae902334496996eb3a8e48",
+			"0x6c116f0d5809a2c28351a737ef3dbd1808685e1fd656e37df6b6e524aa82c918",
+			"0x21e2c8e019c687fdb360c9bdd4e3a5133488cd2e0365aee3b823120734aa6f27",
+			"0x20c9a1db9de894ab4f576265da25f391b32c0805c3da76fbfdd0aaf300f88a39",
+			"0x23ef1f43af87be7396449fc1f89d9766c59e8adf2660812293c65a27482ddb8e",
+			"0x04a82d3a4a5e7f2507688ecdcdc300d7fb97aa8be92a671d7d42c0b60fa4532b",
+			"0x99e204c42afd6d4040faad384517d99bd0e077b03310d32223234d2251d6a07c",
+			"0xe342c0c4295665b9e25773fc9998e18c460e723d0a14efdb59c19b27b9c7011b",
+			"0xb654b1b8ede0d54a605cda54b4635d2b3c2bb8efd01ebd416e52cc87b590d4f3",
+			"0x5daabc41eeb6de98336411a03ec0323995e81549941cf32b7e15c765d1b7b39e",
+			"0x5103fc7f0fc6df43fb081b580bb01476f2b1cbde73e4d0f9d1fa6d8427fae789",
+			"0xe2ecf5daba51d2f7b22106033fc43f956bd1db0c5ad02bd941bd3d2b96ca21c5",
+			"0xf152bce5c6d1efb7e22cde72d6b8ca37f556ffb686a13770c5fab46e04837c92",
+			"0x306007d8091caa5baaa78643307f5abf9a5f03996fc072a9016ba6b487b2017c",
+			"0xf57308d0c02c6b8e2416c070554c7e29911fa84ef4cf2d934e2322ca262e987c",
+			"0xb234fe7433d7fd71fe0c6dfc834e4bcbf84a261b95760a6c4eb67d222b9ff392",
+			"0x753059f3405f60da3aa7cd1aa0cbcfa4d5ef4f2a6ed34b853b2c5ab2181fd383",
+			"0x096c6630e821816d9f4bd83fbe0ccfd223282f34aae5a49f969ba30b98c324c3",
+			"0xd3eec9dedb057fbc839c474fc99cb54d89f3f47d896e06e758c98f1cd194b61f",
+			"0x0d44cb2a83b9a3fa18daac280cf08b46cc637d705488fd9400cd7300475d0a1c",
+			"0x2e37a3036db99c4cb1c135f5ca6b527fa13b2e80ee421805b7be5d8b16983602",
+			"0x381e0ca505308b7d3a083e60b0f9cb44c89f84942430ec9e4c5571796ab6a8eb",
+			"0x90b04d35906c6f5a59c266c3bce7c2b63cea1486f714e272592ef9ecab25b0ee",
+			"0x9cbea70e760f2ee97537d058d57f395886a2c3a6e769ccd3433b797b8716517b",
+			"0x4e2167846e8d6f0f6495b5f1443f59bea143b63f242e40186fc6429434d1136e",
+			"0xcaa0512739d000bb9783fceb46d0427098886e2b7f2e1140855f1a91f843d5b3",
+			"0xc14df4e379e84591f618e60b5953aa6764146c7822aa1f0e3c2287e20753985a",
+			"0xf4443154c04fd378b2c3812fee84b774b37d6e12778674403fb5c995379df866",
+			"0x1a501c2733cc138fb6ff3716899e08dbcd4d75edc18af8972e8a749e45eaf67a",
+			"0xfc8cb80bb0d0fb490f29aae3067641eef72e9225c558e7e299e0796a2086969d",
+			"0x2b7895550febf03070485c02d521e7ddd80b94b7fe33a60b7d7ea3545b13e7dd",
+			"0xfc4137c3cccd45050b5770a40b2f38c43c62b70b07d17bb6d762b405f3d753dc",
+			"0x86ed22bbbb9fc6600112b91601af4fff56d0ecbe9b3099f91d4477cab8e300f5",
+			"0x2273a60405ffb04bd024d880c79010f18d58e3c8ca0dc82795a0125364679fa6",
+			"0x00dfbfe7be3bb2116d9a603a01ac428c0088a2c1477810cd5d3be0d1bd86beab",
+			"0x7acfb03315585c79e2a47dbe847d24cab0785791f6af7f179fea4f9d6ecb0e0f",
+			"0xbf6a2e20ee1da5eec12b792bbaec2531e20766ba54bac423011c1057215851db",
+			"0xb5e94d1e3ba7363d1d79fb62dedd0b6c26b0485052dd64a7093d41ad2d41b890",
+			"0x9b0cc26f08708814960de8f280ac26d8ed5089a19bcbd2d765059306da22c196",
+			"0x22d8af121d3e395d3cb4f6ee43c06e6292f1b5ffda672d2e40dba69a2885f5ac",
+			"0x04bc174272a57189d76aa17de0f76806e8481f4903575ed8c4df12b042637e0e",
+			"0x06ebd2b6ec4b80280969a92726df5f9cb12d4288b60af617b7040876116656d3",
+			"0x0e9430513e63b5173271c89b1c91af0b4818d5d14a3034e1228c56c94186a109",
+			"0x8dc5422ba98d9e58112b052a00d4b82b1db32e22dd7ff2d845619899bd47f277",
+			"0xde513d40bdbb1e4956b468cece598d77134626a900066b92fb2ecd6fcb5f81c2",
+			"0x90746299ec75af1eb444ad14ac666ee444aa020fac3fb57796516d8772ec8f45",
+			"0xaa91c30c62b24f943ee1eec7586b682289541c0355c2726e44424da8686ca24d",
+			"0x76eb68baae9fb7ed126097f93842dcadfe6e7188d61549d9c0922a9b3ef8e80a",
+			"0x5aa5b4045e7fe71559a6e93f4a89b135eaef38b9a7f3a84e383ab1ff902ceca9",
+			"0x504b78f8fc3646e9722e96a5e97d99f2560d4fa3337fa5faf1cc8c8a05f3520d",
+			"0xffd7a5d7c3b21e8144f7678a9ddc039cf85eb32b09000a600c9f12aa7d6083ed",
+			"0xcbb4010000e96ff0b50b9627dae032bd50782ccbd51af8af7cfcd6cd184675f7",
+			"0xb96fabbdd02371bf4a6a0dc00e3874cf43d47246e27163c910c141b6759a4249",
+			"0x7358419f4e994ff296a37f2e88b238b3de6ba73062073c9467dec52a2df64422",
+			"0xca90be9f190a1fd0548becfa719a6e4763e92de0e4da4283a33b5f7d2886b425",
+			"0xa629364f7d6329b008d9c6a0262327bcc12953aa515cdb7b8817e7fe1d746d46",
+			"0xc5167bd8cac1ea6d14f305c9d4fe075e1875d96353e5236473b6daca5ae9b4fe",
+			"0xaf4ce2490e9504172a4393cf14e691e947c86a0ec7b53416384a5832b213d6c5",
+			"0xbfa4853ef2eecc5d99a90e1abfef37ca10c1f823c1d0ad59a1bb19339861241f",
+			"0xbb5a6584cdc7e4d06ec5fc1514233cc42970f6c332c3a9590978dc9908e58c0a",
+			"0xe69d7a0766db411e504f09a8f39f0583b2869016bbe95f21dba432bbe8b88442",
+			"0x89cf4caaaf200881779f5fa6da8ae91ff1c962045dd0622b5ca65c830d3a9d4f",
+			"0x82d66c631f4c4167e5301d896dbdfe24d8245b1de041fc85eaeb6e35117ed9a0",
+			"0x957907bc93879681d8682a188622f9bf2c7d2595dbe3e2e34bb01711cc4124d1",
+			"0xccb3a3380550586696abd3ac267e85c7516b2b682b3c48f66aca94d57500f3b3",
+			"0xaf56d4650406e70748dc860a7879d8d522599081f8e7011056c976b860703e43",
+			"0x5d96ac1d2dff8a054d880a44f5d45a1bd18aba29085fcd633b0608351ff1876c",
+			"0xe051736dad8b9f93a8f1c13031c2b63249925e152685a2e7ec188ee089861b20",
+			"0x0db8987339e1fae41af5f08e6fa15da5fd80de3431b54e82cf8edbdc792f870e",
+			"0xcc99097678110af2be8dc07da8d642dce928b7d9e2728fe6fef1fe2eaa81a72a",
+			"0x2428c1f94ca57c7913b011a68281eee9ee4855e4ed2c97e34a370e649b21acb1",
+			"0x501ee9580c89b1f67c5b3b69ae5fd1f83852a2f9330f53565bcd04d8a7c0b776",
+			"0x16ae47cfa19e8046f93a579fa2557b17aeca7892fc7a82b6d539930c8b7c95c9",
+			"0xda62590043ca70c1cdfc7969cdfa853bddbcef0ef62aabb9f372805322511014",
+			"0x481b4aeaaa60504c94dcfea966840b381db85183c34cd25b4857300b5c189003",
+			"0x035dcc47f8670a9f648bcb0232e42fd4876243a7a3bf737b88d723ba187929a7",
+			"0xebe9bf09e3577865aeb341a06f67bb6e607f10b04ed9f9d733492a9d0e9ceb1a",
+			"0xad5d85b58af6aef7f81bd6b2407c6e4884ec82b2ae2aeaa24e379a3d35902375",
+			"0x0f0dd63d7c6c284659283825624140b31a3adaf7cdbb2255faca443e52ebfe84",
+			"0x40079be1c9394e95b4823895ed380d79333ca2085aed2abd0d766f84d21b7b42",
+			"0x7cc40ed01b436ce225a3f9c5c2bc7f6f81aee40bb83a54bca2fe899b15f3e2b6",
+			"0x1b6356e1a83ca5b0eefda1fd62fa959b118d2a19a6a90f182a53414b3fc7f9f0",
+			"0xae4a71712cc96a5b30b45e3b92c339c2e975e4ed683f4d1fcadcdc121ff7c6bf",
+			"0x226f6d8c71ec32c5eaab6b01c0fc1d00ae95e60b383d09560e90549b79eb1447",
+			"0xf3dec779841c9384df93bcefbba8700a292b570b29d286a7c9c5a442b4788a20",
+			"0x63ef48e80efa45383857adcb0f31076393260cbad058d1938345ad13faae50b4"
 		]
 	},
 	"nodes": [
diff --git a/ethcore/res/ethereum/kovan.json b/ethcore/res/ethereum/kovan.json
index 28126713582..336d32baec0 100644
--- a/ethcore/res/ethereum/kovan.json
+++ b/ethcore/res/ethereum/kovan.json
@@ -43,7 +43,13 @@
 		"eip211Transition": 5067000,
 		"eip214Transition": 5067000,
 		"eip658Transition": 5067000,
-		"wasmActivationTransition": 6600000
+		"wasmActivationTransition": 6600000,
+		"eip145Transition": 9200000,
+		"eip1014Transition": 9200000,
+		"eip1052Transition": 9200000,
+		"eip1283Transition": 9200000,
+		"kip4Transition": 9200000,
+		"kip6Transition": 9200000
 	},
 	"genesis": {
 		"seal": {
@@ -56,8 +62,8 @@
 		"gasLimit": "0x5B8D80"
 	},
 	"hardcodedSync": {
-		"header": "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",
-		"totalDifficulty": "2845866505151538604560067685603735513869853136",
+		"header": "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",
+		"totalDifficulty": "3020091077015059097853315484608800838133866777",
 		"CHTs": [
 			"0xdb9557458495268ddd69409fc1f66631ed5ff9bf6c479be6eabe5d83a460acac",
 			"0xd413800c22172be6e0b7a36348c90098955991f119ddad32c5b928e8db4deb02",
@@ -4214,7 +4220,257 @@
 			"0x3ef50c81169af169c100f58f3afcb8e2f926d957b2adbaca8787be5d4e8d7233",
 			"0x8783eaeb56ca2d7fec84e0e272b77271fdfd6c14452a2e1dd83de770c5d99a1a",
 			"0x861024460895378ba100c5d0c05e62bb6cac8b21ae529ab5cab39eb6c6cabd90",
-			"0x1c741ed9eda60e5ac585e2f48f06fb988367c2c40a0d8111bb04b260fe44ec6b"
+			"0x1c741ed9eda60e5ac585e2f48f06fb988367c2c40a0d8111bb04b260fe44ec6b",
+			"0x6051d77e0596a911bce132c4bc12be2ae5cf29d113dd52a41b3bc166861149ce",
+			"0x92c049df5ddb238644015d4e039e169614ed1d926de070952f2407912906cb4b",
+			"0xa897567fc1ee9437f2876deb3de2b11b8fc00aa07340564031573f0351ec556d",
+			"0x3e54a8e15218db168960d28369003cdb1a76f8db19384e9e2696ae66a6693d6e",
+			"0xc5db7ade97cf28f8b61f2c63a0773201ba64f37dadc19c03943b6772aa7a1a50",
+			"0xda784d1bf64b7efd06558b90cd2436f3e61dc0f7a8370ff92516ed062f461091",
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+			"0x8d0daff5a97327b615d1535fea44fa33610fd645d93035e1e5e2bb49d4dcef24",
+			"0xbb46662b884bc6676d98ebf3f2a35ff9190339b72d68520fe40100b4eafaa2a2",
+			"0x9aa8faaf935c95a60ffae0487844860084a963792ae0bb90a831f825339810ac",
+			"0xfd77b5d6b6b87bfb0ddcad7b0ed3992e5fe897b16db06b118230b2d292e317e9",
+			"0xc465a3384c694bc50cbe97ce9f3bc364884651a97a491f7f64e65dc319d1c9f0",
+			"0xc4634431867d7a302be79e83fb50d01df7f3b950aeede21fcb59b883399b06e4",
+			"0xfd524c29525cb97a89026ff68048ca6e2a9f522791eadd74447a6c278151d7df",
+			"0xc7df516c295a58cf4cd5614eee3d2f773a412dcd4926eadad7e935ecae6d8907",
+			"0xfb915abde0108d6e84354e21a513fa564f5201277e060bb916a9153537fba1f7",
+			"0x1d3c6a780f1b259e096f4a141ab83cb6bd035407421e2468e743daec211e536f",
+			"0xb2f47534f060c70f61a7c16f920d0e11b957bb3ef912ed9292f35b8ceda2acea",
+			"0x03e0ebe6e9992f6921362d463b68f91518d91079c001c6bea7b3452879fdc29c",
+			"0xd9a7de173a1617ad813a554a56d7c7d2f010ac78d7782e524b35b5c676cb72dc",
+			"0x90d05d99167e53d34a02c5b66ed6920190370656905465f20efe56499aa0ba6b",
+			"0x17702606dc895aae35aef034fddf8f7235efcc66e5c9d252347063209c2177b0",
+			"0x3c416492193d81fc03b5c1964989a314e5ee6d689c638c996f6761b4d7acd6be",
+			"0x3c6c1162ea9b277f831989ea26e14bb23ce4d72bb9c865e354992559266ceb16",
+			"0x96de93f849613bb2ffc117bf111d4798b9252649f94f21187da324a3fe363833",
+			"0x91e50fc6e564cb9d6b7aab3a6e93f6b32944d5a781196a9a8b12ac7f6f527565",
+			"0xdbefa2bb2ee620d75295d0f3103e06b428f955dba1a792421e435051c46f7933",
+			"0x78f29df98ef7dce9fe7b4414da90fb4df5d99231ab0a3b7a3e70659986580fe4",
+			"0x56cf56899c2388d55eb1496ccbe62041d14cf655c9dbc53984d86c22ed281acd",
+			"0x099f52c675171088550a9e93e1ab17f003190fa3388d956724d422e5925c4813",
+			"0x9913e4ad8405b8a60fa512fb616c544c6cdc415cb1023aad0669d58cc3810161",
+			"0xbf5d51369b2510bb57f8fc8e9342890e8bb37049079dc79ab97afc0bcbf3cbf2",
+			"0x3a012d45d250c818b641fb18b71b622f5bdf0b7a541e0d8de54f61e516ee3ce7",
+			"0x0233833414d2cff3da0326f7baccf1bd522db5fee290ab4fc0a976934a20358e",
+			"0x38a0978c955f20cdc32e2013a5373efbfc50924e45e9c4c756291a903f4162b4",
+			"0x4107f33a14052662a0469ddd646ab6659006df131c4b0f6b0e6cfd331b46fea2",
+			"0x8074fb5054c755c912bc68b1dc22ae40ba13c06912c8af1c12652eb4d84c6503",
+			"0xf6d151b8f9c26c3a31366d967dd7338e80e8107b9b81da0a98faf16df9cbc91a",
+			"0xcebb0256d0a8a4b22d2341ec7c48292c3226caf4aeaa2003ee36dde25cff833b",
+			"0x5fa9ac499a2642b0cb7ca365062c02588f9c555bcdf584f533ee8e8544b9928d",
+			"0x800c7f04db30247318b8d4c11d575dca66bf615674fbeb9e8c20f387d907c8e2",
+			"0xb0a43de06c9d48afefd5411d759e3c6293cbea4a7c6d862b119182ea02af81b7",
+			"0xb6e7ca0075d28959cf87d716fea885e9e3a0062fc7da1b6e06089c808a632b8a",
+			"0x734c1b19f0b5972b5215f675cf60c68c12cf6d6bda7b5a95ee9a781482e68365",
+			"0x1995b08fffb20dedbef592ac23a81d87129ceb396e065265dd4a6cb876beaf09",
+			"0x051082047a6b579684b5444ce5b75bc630277ec06b0087779387b9d7fcd18fec",
+			"0x4aabfe145c368e6878e2ccbdfbecf2f1db5c9078650696bb3a584c14fe17177f",
+			"0x42811ab68b304ce30fe896c52b53d861abc3c8b5e4e740fa97b1695db9a6691f",
+			"0xd90cdb12ad64f86b2aa7afb781c00301f50206b05f1543b111c2b971ed209c94",
+			"0x385435507c2ef42b5f1760b97497e8a02a4b5ec4926c3cce8569fc0f4be59ce8",
+			"0x2d7a4908350c9cf022920cc51e0cad9c3c05d1d14a92d72310b52f984c857101",
+			"0xceea9c58106f4f806a256f64dc04e1c4b53e6cc5eb048f3df7a14f8de3506e96",
+			"0x7032f864eb3eae8d198c3f8edd9cc2dfe88b9971cd01b33318dcba004f9b044b",
+			"0x71bfeb4c183b20fba60e225524c809b0864fa14f5c0137accc36649ed0712e5c",
+			"0xef0ec5a2761c46827110c20e14fc4aecadc2407541ea046de09a58cda3b2e839",
+			"0x5e6debf328055c9413fc3eeca28583f917b361a5b5bda9af4306929931a4116a",
+			"0x1aab81df07eab969189333e5b2930fcc1b88a525ec5bc6af6626fdcb202b8f34",
+			"0xbdbf97e1558711d4872821b9400e03a811c61096bb838d3126b1c2154f8fb776",
+			"0x7d8aaee482933ffaa97777af3e4bf69ce7d99afb24e546d2e365d445d3d0190d",
+			"0x9da421621b14164582b2b877090c9a956f3a7c917031bf743a9ce457b6292369",
+			"0x050d717f0433a72b17a0e9a1340f26aed5bf17f90c08a5b73e675860ac9c24de",
+			"0x80551d3ff835aaf987b9ec056a73a3890985ef551431daa9d4aca10c81cac7fd",
+			"0x625a5b5aed2660d32d2fd8c4d1bfc248365a5cddaf9b5695e3f131629739ec60",
+			"0x7d86bc2dc5914d16b3d0d882a5db0230b4b688cbd8c81098d2efc5080e589646",
+			"0xfe42cd832cdffe56426031ba7d837c56d86be72b89ca9f5474bd08db80cfe903",
+			"0x0ca30e1fd3bf3e16a0e295ecbb442757248b2ad47baf88fc37d6c55901e709f6",
+			"0x2a83ed111b99844e17fb7aa69854525958255ffea04e0bfdc365264e72b349db",
+			"0x709779de19590b69864f5b9228b3a1c334724e20be006ef5ae38f8c05eb6f37e",
+			"0xf09c664d0e2e88ad5418d14481fefdc9e9c46158bc5439ffe0bf6d6d5ecb2eda",
+			"0xf350785dd3617ef73b0a5bf439ce5c49adca0c041b6b5047a664e5e33967ddf7",
+			"0x8fcf87571154dc4eb0a73c6ee31cc0db5f4e064cf23a255a408b2f2c7cc9c0e9",
+			"0x75801fc8867ce7c75b3148c6c022d7702143b93d93c1fc2349e3e969d0179cae",
+			"0xf14c18bf68ae881d3fb07f631340b00557a83860d0ba0efbfe55fe199176aff6",
+			"0xbe48c727fb6a32242229eaa09146c76522dcf6bed6d1c6fc1bebf86b5e4ccdb4",
+			"0x8487b971e383272df82cd812a0bf3a2026b85bc3897b4ce9ce48afa00849fe00",
+			"0x60d18b465172f59c0d71594b5273a90cb41db24a5d4c9fc37020f9d8c467a4a2",
+			"0xab4e36d9f17c748c87d89c23b667e3f4e3265e77b62dbd9c92659026f8a53d12"
 		]
 	},
 	"accounts": {
diff --git a/ethcore/res/ethereum/poacore.json b/ethcore/res/ethereum/poacore.json
index b80b3a113fd..115108f27bb 100644
--- a/ethcore/res/ethereum/poacore.json
+++ b/ethcore/res/ethereum/poacore.json
@@ -15,9 +15,14 @@
 						},
 						"772000": {
 							"safeContract": "0x83451c8bc04d4ee9745ccc58edfab88037bc48cc"
+						},
+						"5329160": {
+							"safeContract": "0xa105Db0e6671C7B5f4f350ff1Af6460E6C696e71"
 						}
 					}
-				}
+				},
+				"blockRewardContractAddress": "0x4d0153D434384128D17243409e02fca1B3EE21D6",
+				"blockRewardContractTransition": 5761140
 			}
 		}
 	},
diff --git a/ethcore/res/ethereum/poasokol.json b/ethcore/res/ethereum/poasokol.json
index 443ebbed0e4..c6d51a9c8a6 100644
--- a/ethcore/res/ethereum/poasokol.json
+++ b/ethcore/res/ethereum/poasokol.json
@@ -18,9 +18,14 @@
 						},
 						"509355": {
 							"safeContract": "0x03048F666359CFD3C74a1A5b9a97848BF71d5038"
+						},
+						"4622420": {
+							"safeContract": "0x4c6a159659CCcb033F4b2e2Be0C16ACC62b89DDB"
 						}
 					}
-				}
+				},
+				"blockRewardContractAddress": "0x3145197AD50D7083D0222DE4fCCf67d9BD05C30D",
+				"blockRewardContractTransition": 4639000
 			}
 		}
 	},
diff --git a/ethcore/res/ethereum/ropsten.json b/ethcore/res/ethereum/ropsten.json
index 3f938042f24..264e6ee977f 100644
--- a/ethcore/res/ethereum/ropsten.json
+++ b/ethcore/res/ethereum/ropsten.json
@@ -9,12 +9,14 @@
 				"durationLimit": "0x0d",
 				"blockReward": {
 					"0": "0x4563918244F40000",
-					"1700000": "0x29A2241AF62C0000"
+					"1700000": "0x29A2241AF62C0000",
+					"4230000": "0x1BC16D674EC80000"
 				},
 				"homesteadTransition": 0,
 				"eip100bTransition": 1700000,
 				"difficultyBombDelays": {
-					"1700000": 3000000
+					"1700000": 3000000,
+					"4230000": 2000000
 				}
 			}
 		}
@@ -26,8 +28,8 @@
 		"maximumExtraDataSize": "0x20",
 		"minGasLimit": "0x1388",
 		"networkID" : "0x3",
-		"forkBlock": 3383558,
-		"forkCanonHash": "0x6b4b80d65951375a70bc1ecf9a270d152dd355454d57869abbae2e42c213e0f3",
+		"forkBlock": "0x40E80F",
+		"forkCanonHash": "0x3e12d5c0f8d63fbc5831cc7f7273bd824fa4d0a9a4102d65d99a7ea5604abc00",
 		"maxCodeSize": 24576,
 		"maxCodeSizeTransition": 10,
 		"eip150Transition": 0,
@@ -39,7 +41,11 @@
 		"eip140Transition": 1700000,
 		"eip211Transition": 1700000,
 		"eip214Transition": 1700000,
-		"eip658Transition": 1700000
+		"eip658Transition": 1700000,
+		"eip145Transition": 4230000,
+		"eip1014Transition": 4230000,
+		"eip1052Transition": 4230000,
+		"eip1283Transition": 4230000
 	},
 	"genesis": {
 		"seal": {
@@ -56,8 +62,8 @@
 		"gasLimit": "0x1000000"
 	},
 	"hardcodedSync":{
-		"header": "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",
-		"totalDifficulty": "9811143388018700",
+		"header": "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",
+		"totalDifficulty": "12027449412394243",
 		"CHTs": [
 			"0x614648fc0a459451850bdfe353a932b5ff824e1b568478394f78b3ed5427e37a",
 			"0x1eae561c582dbb7f4e041998e084e165d0332c915d3a6da367638a8d24f3fafc",
@@ -1971,14 +1977,154 @@
 			"0xb652952de1bf9e1174e5f6a37b069b437792672a37a9e0159c4f36b6e64306b4",
 			"0xb72dd6cb5df1b00dbbd84e097e2da79af2ce60559697ab4c93b0a8b85b2ee406",
 			"0xb96fd4a94ac30c10f757691f7f06f25a4900fe424f4eb7ccf322e2f95249b914",
-			"0x99fd442599036f161ccef1ae8088c5ef694c1819f5b76d9d2fa8f979935f69f8"
+			"0x99fd442599036f161ccef1ae8088c5ef694c1819f5b76d9d2fa8f979935f69f8",
+			"0x3e53574f6ae31a45ef928f9c37bea6c61e6d728a5ade9851567d3167f5ca3314",
+			"0xd7e3d08c5b71a7ad8338e8b51ec54cb11ad4d643d129a371af07376f8c47c1d4",
+			"0x1033c8aed4ec46377f75cc9a6b3297e1da0a7d1e74df20bae9fdf6d037afdc28",
+			"0x924d621544f3301f9e212fbb95872fce9eb4a4172a11693674de733bfc2b0018",
+			"0x7f61884149ea4def1444a70c022da1c23f31ecc51bb175905b492236a57c7fde",
+			"0x40c50785bc0665ab4eb3cec95405e17510c571570a5859ead804530dbcbd1387",
+			"0xf806491cf778f4796c0f73428e6eaf237da8488af99e9b61d72c56fa03e7051c",
+			"0x7a9670842dcb12c66f11e357a84849cee227ea5a7351e7c6c9370e9ef2560129",
+			"0x1c974da4e1073157c10deac8b256c8ced77a030e0500b2b8a90b6ca1d32ab4fa",
+			"0x97ebcc81ba9c1e04865ee4617daa967dec39f65501be21fbbe929db869d57dd8",
+			"0xa36e4506065d8b9c662697b18ffe50ed2f6ccfe6d07a065bdad048778cc53668",
+			"0xb9d5566eb0d40bbb03114d333d1d1dc85b0e780ec63229f3b93b2c84af5f9509",
+			"0xcd16693573724880c3c83834d516be65c35a861b76b43878e28aa7fcbc961361",
+			"0x4f60ecd7811acc087fc4557fdfaa1a0b522fe30da1cbae5e7740eec3cff04c00",
+			"0x9e58573b152bf5008e0ea3fc0d64573211916521a62fb08ba0f1b44c5da12e7d",
+			"0x2c6693cfd7e5bf9a3d8cef9e186b3da25d07af983564ced6238f9191b020f105",
+			"0x8cc6149caeafef85ec7b2456f33530459c52b30a5365a2a0022b1c308357f7b4",
+			"0x6f66863bd9909f687523128569cd0894c4cf41e2eddd5cd9c20d30c446b1711b",
+			"0x402317752053e7b6d7e2d5512d6397112d80ace0873f5f9d32c023a402ec03b3",
+			"0x2fcd50a79495057908bd34875e3531e6298488f0d06d043fb6fb0b140895d379",
+			"0x533ba9669dcee2c6e35713c7eca3bca168a326a36b0e39fcde76cbd35ab3d99d",
+			"0xdc2e86503e8066bc5fac91fe63544e33568a3c744967b9360458101c3d9df096",
+			"0xf994b38ba312d8bfb00d428b13a088738d93965b525eae81b45b9be344f99fd2",
+			"0x0721f3f772958d6a58dba638453b8d004e0c76dc8b4cf6d595b712edddcf002f",
+			"0x3c650c2c7ebbe7879a15882c3157552e8ae1adebea8f0c65a2dda272cc4ed838",
+			"0x649fe38e87546703245a7adf5925e8c7a07942750e14d39553a56ca3fcbd8c65",
+			"0xad204bf42d2a444faa864df8e9d023483a6b6daaa8001e00bb5373a45ed064a3",
+			"0x2c5cdc73d8ddef2e5c0d47358ac180043e7e246e590a7e8ad2b0a3f9b4e9375d",
+			"0xf38f6c364bbbbe626e849ca9bb9324c54cf0ba8dfc0b2741a3ff87ce7734adbc",
+			"0x317efc1cea774849d6219d31c8464a15956da4f3810bf15d4353443f79d98e75",
+			"0xb6796dccdf4d3cab16b5ec9567237cb988ee94131f3262c2a581180b775e76de",
+			"0x1fde3fdf2303d080d400c43345a424f50f6551a6a06ad50c6e277d49e8034df3",
+			"0x4d7bc44a3b56f5e69fd3e5e8c0cd8f5f839a775c4ee381b4b1d0a36656cf91cc",
+			"0x6051b60fdced0c51aa6a1cab2418c8f21c5d174109d514a4c6de758b2056611b",
+			"0x3c2f7be830078af3c2c6d1557b3da74d1d5bbfd8094f98886a959aa71ce70b15",
+			"0x8f296b90a0ece0a3dbec19a801072497c5840f9c0491062cd402db00c2b69f2a",
+			"0x6c14c4697f8291dbdfdbfea5522798e3f8b17204f80d8370e6d379e6ee659e77",
+			"0x4e98f63afaa50f8a30b0d352eb5fcb5403c635cf54b41545aa8b48465d23fb1d",
+			"0xad3059433e981ff12cd0d7dbc11a8d92a65cb39c6e936e9c7db5934d45806492",
+			"0x1cbb21f28ad2d191d6850c97487e5a733306f2f6ba370723fd5ed37cf6c880a0",
+			"0x82a0010a1b20d383bff0e5d7ba3751bc0d9161a4817554432558c5c2825babb3",
+			"0x33e54e93443e87c003d582dc51d0b9981ddcaeac4df0993877739651cbf52a58",
+			"0x1de8bc150f4142cd45b5d0784e5952abd8de7cba9654af959498c0fd0bcac404",
+			"0x3ee852f48a1a930d671e53c9c8d8c3c38353ee1737c093960c3f841e6c682e94",
+			"0xa9c6e05ec91e2a2f2f003419063fe033e37e5353c6e233706e29c08693e35eb8",
+			"0x649f7328064c55c03249d527dadaedcdbb4cb0e939d94c866844192d99469e05",
+			"0x3a407d00efcd5fe7bb765347b1a3f231b744349269b3aeb44099f4bdd068eb9e",
+			"0xa1a20af2f7e61082810ce7e7afe6118bc0ad95e9641e6129027f46af28048107",
+			"0x0d68fc5e58cacb2d16d99a0e9e612d674754ea51cbee2c68a21f4b0aa926688c",
+			"0x9b3e58144c014343271c9dc90daa8d2f642954b3eda223d64bbb0ac41380e512",
+			"0xd3de08b676d4f06bbf4322ed4340caab76e6ab7144c97af91c2bc9c749e65b38",
+			"0x21d626c9c38087aac6262b64f09398be6e4cbf246100d8c2416cab57e9ac1b68",
+			"0x563a450e35f40279f5946641a823f596ef3ad22a45b8ec280128546aeb0faf14",
+			"0xadd9c7128e14e670c7d21d6dfa5c09a11dfd237e90709b087e3329d3cd89b5fd",
+			"0x258cc0f845d8e7438a707f590f55203c6c51302cef4cfbf788b1c7054688da14",
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+			"0xc899f45494660034d343670856c13a32b230d047434a4d54a772132ddfe3e182",
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+			"0x47272a21a07ad5e14e3f97b237dab7e33344da4db5b2d31bc7cd0cc2d2c9f1db",
+			"0x9540755fd321d125b73cb6f1884c2f0b2a821d29362194f5029a5e7ba2d3ed44",
+			"0x229b88922fe52a78090673775f264cd665fe222002d6add2ed29b7ffd98de717",
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+			"0xa1f421108d49ed23996e55012613fc05e0f86e00f17251b1ff1e0824d35befc7",
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+			"0x28220e7d1a9583d68656f03ef4d6fa3e249c71d1b42698f87ba1fc582493e194",
+			"0xe8aa37b3214abb1bc167fdb6f10119a4019541f31c76b3b3f8c363bb138bd09e",
+			"0x825189c2c836dda454b457a03ff83d422bf78df1f368434768690fa7f51c57e0",
+			"0x5dad65d275e69478c81ecaec5b872660205735d9649ac020f65f5ea6ae972dda",
+			"0x84a1184d8f94fab280e0593479179348f9184d6fe5a2b2ea9697894c42574473",
+			"0xbef5a05bc7e1fb94465570144499672d95f31fa241b4c510011f6677e2bf72fb",
+			"0xd08235ebe6d79a8549bcd3d2414cd8afd2a3e2ca22ced226c60aacad1361ff89",
+			"0xbab5204ad45ec52860023e7474579e7c95397f3c4ac01db7e446e92c19dceef0",
+			"0x6c81acf2ff161d423a904c457166ff454ef41571d01e73d56bf9ab892790248d",
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+			"0xb06f220566a5e62570b9e9e49a8b9d5663501ba145b12260fbf9d4a18a4b19e3",
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+			"0x7e1a18f6199f05f21f9eb5463e9ffd87637d2fd24a23047fe095895c533cb6a5",
+			"0xe1b8813a95e511aaec9b358d515e624fbc20e551c56328f843ae90b3c895d3a2",
+			"0xc2ea59f3d1e7bbe115390a4c210142fe9f9dcb1959764450f5b5292ad90e0fcf",
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+			"0x185f5fd1f7001b533dc01783c83b7ab0828a4e2f188cc4e26768c515b4c421f6",
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+			"0x4dd1d52da1d260d1f0f63bafc4c816b30cea8ec3434e7d4b63a0eff86997254c",
+			"0x0b3eb94aa246f7c8c871535ae2d3abe5c1b951e76b77510140ef52d5ea2457ee",
+			"0x27102708eea5d715799642f213049d8ac9abc3b12c76d147ce443dab28af96d8",
+			"0x81fb3c4e8dc6c658af2901b7aebf7467b9ae045dd0f58fe8d77f8770ac517fb6",
+			"0xf68dba4eee635d7494bae6fb9f0c44e739b3121d4bc6f6f21b495a716af3cf52",
+			"0xcf87b723dc473d313bf9ddfa233056036c5658777e831796f1f56647cd040c8d",
+			"0x49927c2100039ac496d9c16dd12f0a05c9441b8616c69c726fd2e79ae65e130c",
+			"0x088195c7251f6b9fa2105e77df5620211b8ca783a77f1a98de6752fc442c26c7",
+			"0x604de480bcb88e908b90451c4142b99b9cbb479167473befca7bea9b4ca427a3",
+			"0x642fdaf6bc1abbf261a9480fcf9bb48cf03fb80bdd434c6ab63401856c74fa39",
+			"0xe6b596393fce7a3023a316ac34a1fac18e18779ca5983791866f857f257592e1",
+			"0x40384a52564fae5df8c3e41827cdf584e38f3f555a54ca749b7b516619071d85",
+			"0xe52f7c17a4106594563ae7b724e5613e87d8442177f39a36b946b0e335be0e5b",
+			"0x7726202a7c255a9d7be47af6f3b44c1e379cda61237866554396fb6ec043482c",
+			"0x665da353f296cde80e3cbcb9c7f93b107d5676e5cd694b0bd33334d74789beb9"
 		]
 	},
 	"nodes": [
 		"enode://6332792c4a00e3e4ee0926ed89e0d27ef985424d97b6a45bf0f23e51f0dcb5e66b875777506458aea7af6f9e4ffb69f43f3778ee73c81ed9d34c51c4b16b0b0f@52.232.243.152:30303",
 		"enode://94c15d1b9e2fe7ce56e458b9a3b672ef11894ddedd0c6f247e0f1d3487f52b66208fb4aeb8179fce6e3a749ea93ed147c37976d67af557508d199d9594c35f09@192.81.208.223:30303",
 		"enode://30b7ab30a01c124a6cceca36863ece12c4f5fa68e3ba9b0b51407ccc002eeed3b3102d20a88f1c1d3c3154e2449317b8ef95090e77b312d5cc39354f86d5d606@52.176.7.10:30303",
-		"enode://865a63255b3bb68023b6bffd5095118fcc13e79dcf014fe4e47e065c350c7cc72af2e53eff895f11ba1bbb6a2b33271c1116ee870f266618eadfc2e78aa7349c@52.176.100.77:30303"
+		"enode://865a63255b3bb68023b6bffd5095118fcc13e79dcf014fe4e47e065c350c7cc72af2e53eff895f11ba1bbb6a2b33271c1116ee870f266618eadfc2e78aa7349c@52.176.100.77:30303",
+		"enode://691907d5a7dee24884b791e799183e5db01f4fe0b6e9b795ffaf5cf85a3023a637f2abadc82fc0da168405092df869126377c5f190794cd2d1c067245ae2b1ce@13.125.237.43:30303"
 	],
 	"accounts": {
 		"0000000000000000000000000000000000000000": { "balance": "1" },
diff --git a/ethcore/res/ethereum/tests-issues/currents.json b/ethcore/res/ethereum/tests-issues/currents.json
new file mode 100644
index 00000000000..b6be610eb92
--- /dev/null
+++ b/ethcore/res/ethereum/tests-issues/currents.json
@@ -0,0 +1,468 @@
+{ "block":
+	[
+		{
+			"reference": "9590",
+			"failing": "stCreateTest",
+			"subtests": [
+				"CreateOOGafterInitCodeReturndata2_d0g1v0_Constantinople"
+			]
+		},
+		{
+			"reference": "9590",
+			"failing": "stCreate2",
+			"subtests": [
+				"RevertDepthCreateAddressCollision_d0g1v0_Constantinople",
+				"RevertDepthCreateAddressCollision_d1g1v1_Constantinople",
+				"CREATE2_Suicide_d5g0v0_Constantinople",
+				"CREATE2_Suicide_d7g0v0_Constantinople",
+				"create2collisionSelfdestructedOOG_d2g0v0_Byzantium",
+				"create2collisionSelfdestructedOOG_d2g0v0_Constantinople",
+				"create2collisionNonce_d1g0v0_Byzantium",
+				"create2collisionNonce_d1g0v0_Constantinople",
+				"CreateMessageRevertedOOGInInit_d0g1v0_Constantinople",
+				"create2callPrecompiles_d3g0v0_Constantinople",
+				"create2collisionCode_d1g0v0_Byzantium",
+				"create2collisionCode_d1g0v0_Constantinople",
+				"create2collisionStorage_d0g0v0_Byzantium",
+				"create2collisionStorage_d0g0v0_Constantinople",
+				"create2callPrecompiles_d4g0v0_Constantinople",
+				"create2collisionSelfdestructedRevert_d0g0v0_Byzantium",
+				"create2collisionSelfdestructedRevert_d0g0v0_Constantinople",
+				"CreateMessageReverted_d0g1v0_Constantinople",
+				"RevertOpcodeCreate_d0g1v0_Constantinople",
+				"CREATE2_Suicide_d11g0v0_Constantinople",
+				"create2checkFieldsInInitcode_d5g0v0_Constantinople",
+				"create2collisionSelfdestructedOOG_d1g0v0_Byzantium",
+				"create2collisionSelfdestructedOOG_d1g0v0_Constantinople",
+				"returndatacopy_following_create_d1g0v0_Constantinople",
+				"RevertDepthCreate2OOG_d1g1v1_Constantinople",
+				"create2collisionSelfdestructed_d2g0v0_Byzantium",
+				"create2collisionSelfdestructed_d2g0v0_Constantinople",
+				"create2callPrecompiles_d2g0v0_Constantinople",
+				"create2InitCodes_d2g0v0_Constantinople",
+				"create2collisionNonce_d2g0v0_Byzantium",
+				"create2collisionNonce_d2g0v0_Constantinople",
+				"create2collisionCode_d0g0v0_Byzantium",
+				"create2collisionCode_d0g0v0_Constantinople",
+				"CREATE2_Bounds_d0g0v0_Constantinople",
+				"RevertDepthCreate2OOG_d0g0v0_Constantinople",
+				"CREATE2_Suicide_d1g0v0_Constantinople",
+				"CREATE2_Bounds3_d0g1v0_Constantinople",
+				"create2collisionStorage_d2g0v0_Byzantium",
+				"create2collisionStorage_d2g0v0_Constantinople",
+				"RevertDepthCreateAddressCollision_d0g0v1_Constantinople",
+				"create2callPrecompiles_d5g0v0_Constantinople",
+				"create2collisionCode2_d0g0v0_Byzantium",
+				"create2collisionCode2_d0g0v0_Constantinople",
+				"create2noCash_d0g0v0_Byzantium",
+				"create2noCash_d0g0v0_Constantinople",
+				"create2checkFieldsInInitcode_d7g0v0_Constantinople",
+				"create2SmartInitCode_d1g0v0_Constantinople",
+				"create2InitCodes_d6g0v0_Constantinople",
+				"create2noCash_d1g0v0_Byzantium",
+				"create2noCash_d1g0v0_Constantinople",
+				"CREATE2_ContractSuicideDuringInit_ThenStoreThenReturn_d0g0v0_Constantinople",
+				"RevertOpcodeInCreateReturns_d0g0v0_Constantinople",
+				"create2collisionStorage_d1g0v0_Byzantium",
+				"create2collisionStorage_d1g0v0_Constantinople",
+				"create2checkFieldsInInitcode_d3g0v0_Constantinople",
+				"create2collisionBalance_d0g0v0_Byzantium",
+				"create2collisionBalance_d0g0v0_Constantinople",
+				"create2collisionSelfdestructed2_d0g0v0_Constantinople",
+				"create2InitCodes_d3g0v0_Constantinople",
+				"create2collisionCode2_d1g0v0_Byzantium",
+				"create2collisionCode2_d1g0v0_Constantinople",
+				"create2checkFieldsInInitcode_d1g0v0_Constantinople",
+				"create2collisionBalance_d1g0v0_Byzantium",
+				"create2collisionBalance_d1g0v0_Constantinople",
+				"CREATE2_Bounds3_d0g2v0_Constantinople",
+				"create2callPrecompiles_d6g0v0_Constantinople",
+				"Create2Recursive_d0g0v0_Constantinople",
+				"create2collisionSelfdestructedOOG_d0g0v0_Byzantium",
+				"create2collisionSelfdestructedOOG_d0g0v0_Constantinople",
+				"CREATE2_Suicide_d3g0v0_Constantinople",
+				"returndatacopy_following_create_d0g0v0_Constantinople",
+				"create2InitCodes_d8g0v0_Constantinople",
+				"RevertDepthCreate2OOG_d0g0v1_Constantinople",
+				"create2checkFieldsInInitcode_d2g0v0_Constantinople",
+				"RevertDepthCreate2OOG_d1g0v1_Constantinople",
+				"Create2OnDepth1024_d0g0v0_Constantinople",
+				"create2collisionSelfdestructed2_d1g0v0_Constantinople",
+				"create2collisionSelfdestructedRevert_d2g0v0_Byzantium",
+				"create2collisionSelfdestructedRevert_d2g0v0_Constantinople",
+				"create2callPrecompiles_d0g0v0_Constantinople",
+				"RevertDepthCreateAddressCollision_d0g1v1_Constantinople",
+				"create2collisionSelfdestructed_d1g0v0_Byzantium",
+				"create2collisionSelfdestructed_d1g0v0_Constantinople",
+				"call_outsize_then_create2_successful_then_returndatasize_d0g0v0_Byzantium",
+				"call_outsize_then_create2_successful_then_returndatasize_d0g0v0_Constantinople",
+				"Create2OOGafterInitCodeRevert_d0g0v0_Constantinople",
+				"Create2OOGafterInitCodeReturndata3_d0g0v0_Constantinople",
+				"Create2OOGafterInitCodeReturndataSize_d0g0v0_Constantinople",
+				"create2InitCodes_d7g0v0_Constantinople",
+				"CREATE2_Suicide_d10g0v0_Constantinople",
+				"RevertDepthCreate2OOG_d0g1v0_Constantinople",
+				"create2InitCodes_d5g0v0_Constantinople",
+				"create2collisionSelfdestructedRevert_d1g0v0_Byzantium",
+				"create2collisionSelfdestructedRevert_d1g0v0_Constantinople",
+				"RevertDepthCreate2OOG_d1g1v0_Constantinople",
+				"create2collisionSelfdestructed_d0g0v0_Byzantium",
+				"create2collisionSelfdestructed_d0g0v0_Constantinople",
+				"create2noCash_d2g0v0_Byzantium",
+				"create2noCash_d2g0v0_Constantinople",
+				"CREATE2_Bounds3_d0g0v0_Constantinople",
+				"create2collisionNonce_d0g0v0_Byzantium",
+				"create2collisionNonce_d0g0v0_Constantinople",
+				"CREATE2_Suicide_d2g0v0_Constantinople",
+				"Create2OOGafterInitCode_d0g0v0_Constantinople",
+				"call_then_create2_successful_then_returndatasize_d0g0v0_Byzantium",
+				"call_then_create2_successful_then_returndatasize_d0g0v0_Constantinople",
+				"create2collisionBalance_d2g0v0_Byzantium",
+				"create2collisionBalance_d2g0v0_Constantinople",
+				"create2checkFieldsInInitcode_d6g0v0_Constantinople",
+				"RevertDepthCreate2OOG_d0g1v1_Constantinople",
+				"returndatacopy_afterFailing_create_d0g0v0_Constantinople",
+				"returndatacopy_following_revert_in_create_d0g0v0_Constantinople",
+				"CREATE2_Suicide_d9g0v0_Constantinople",
+				"create2callPrecompiles_d7g0v0_Constantinople",
+				"RevertDepthCreateAddressCollision_d1g0v1_Constantinople",
+				"create2InitCodes_d1g0v0_Constantinople",
+				"CREATE2_Bounds_d0g1v0_Constantinople",
+				"Create2OOGafterInitCodeReturndata_d0g0v0_Constantinople",
+				"create2checkFieldsInInitcode_d4g0v0_Constantinople",
+				"CreateMessageRevertedOOGInInit_d0g0v0_Constantinople",
+				"RevertDepthCreateAddressCollision_d1g1v0_Constantinople",
+				"returndatacopy_following_successful_create_d0g0v0_Constantinople",
+				"create2checkFieldsInInitcode_d0g0v0_Constantinople",
+				"CreateMessageReverted_d0g0v0_Constantinople",
+				"create2SmartInitCode_d0g0v0_Constantinople",
+				"CREATE2_Bounds2_d0g0v0_Constantinople",
+				"returndatasize_following_successful_create_d0g0v0_Constantinople",
+				"CREATE2_Bounds2_d0g1v0_Constantinople",
+				"returndatacopy_0_0_following_successful_create_d0g0v0_Constantinople",
+				"RevertDepthCreateAddressCollision_d0g0v0_Constantinople",
+				"CREATE2_Suicide_d0g0v0_Constantinople",
+				"create2InitCodes_d0g0v0_Constantinople",
+				"Create2OnDepth1023_d0g0v0_Constantinople",
+				"create2InitCodes_d4g0v0_Constantinople",
+				"Create2OOGafterInitCodeReturndata2_d0g0v0_Constantinople",
+				"create2collisionBalance_d3g0v0_Byzantium",
+				"create2collisionBalance_d3g0v0_Constantinople",
+				"CREATE2_Suicide_d4g0v0_Constantinople",
+				"Create2OOGafterInitCode_d0g1v0_Constantinople",
+				"RevertDepthCreateAddressCollision_d1g0v0_Constantinople",
+				"Create2OOGafterInitCodeRevert2_d0g0v0_Constantinople",
+				"Create2OOGafterInitCodeReturndata_d0g1v0_Constantinople",
+				"Create2Recursive_d0g1v0_Constantinople",
+				"create2collisionCode_d2g0v0_Byzantium",
+				"create2collisionCode_d2g0v0_Constantinople",
+				"CREATE2_Suicide_d6g0v0_Constantinople",
+				"CREATE2_Suicide_d8g0v0_Constantinople",
+				"RevertOpcodeCreate_d0g0v0_Constantinople",
+				"Create2OOGafterInitCodeReturndata2_d0g1v0_Constantinople",
+				"create2callPrecompiles_d1g0v0_Constantinople",
+				"RevertInCreateInInit_d0g0v0_Constantinople",
+				"RevertDepthCreate2OOG_d1g0v0_Constantinople"
+			]
+		},
+		{
+			"reference": "9590",
+			"failing": "bcStateTest",
+			"subtests": [
+				"suicideStorageCheck_Byzantium",
+				"suicideStorageCheck_Constantinople",
+				"suicideStorageCheckVCreate2_Byzantium",
+				"suicideStorageCheckVCreate2_Constantinople",
+				"create2collisionwithSelfdestructSameBlock_Constantinople",
+				"blockhashNonConstArg_Constantinople",
+				"suicideThenCheckBalance_Constantinople",
+				"suicideThenCheckBalance_Homestead",
+				"suicideStorageCheckVCreate_Byzantium",
+				"suicideStorageCheckVCreate_Constantinople"
+			]
+		},
+		{
+			"reference": "9590",
+			"failing": "stEIP158Specific",
+			"subtests": [
+				"callToEmptyThenCallError_d0g0v0_Byzantium",
+				"callToEmptyThenCallError_d0g0v0_Constantinople",
+				"callToEmptyThenCallError_d0g0v0_EIP158"
+			]
+		},
+		{
+			"reference": "9590",
+			"failing": "stPreCompiledContracts",
+			"subtests": [
+				"identity_to_smaller_d0g0v0_Constantinople",
+				"identity_to_bigger_d0g0v0_Constantinople"
+			]
+		},
+		{
+			"reference": "9590",
+			"failing": "stReturnDataTest",
+			"subtests": [
+				"modexp_modsize0_returndatasize_d0g1v0_Constantinople",
+				"modexp_modsize0_returndatasize_d0g2v0_Constantinople",
+				"modexp_modsize0_returndatasize_d0g3v0_Constantinople"
+			]
+		},
+		{
+			"reference": "9590",
+			"failing": "stSpecialTest",
+			"subtests": [
+				"push32withoutByte_d0g0v0_Constantinople"
+			]
+		}
+
+	],
+	"state":
+	[
+		{
+			"reference": "9590",
+			"failing": "stCreateTest",
+			"subtests": {
+				"CreateOOGafterInitCodeReturndata2": {
+					"subnumbers": ["2"],
+					"chain": "Constantinople (test)"
+				}
+			}
+		},
+		{
+			"reference": "9590",
+			"failing": "stCreate2Test",
+			"subtests": {
+				"RevertInCreateInInit": {
+					"subnumbers": ["1"],
+					"chain": "Constantinople (test)"
+				}
+			}
+		},
+		{
+			"reference": "9590",
+			"failing": "stEIP150Specific",
+			"subtests": {
+				"NewGasPriceForCodes": {
+					"subnumbers": ["1"],
+					"chain": "Constantinople (test)"
+				}
+			}
+		},
+		{
+			"reference": "9590",
+			"failing": "stInitCodeTest",
+			"subtests": {
+				"OutOfGasContractCreation": {
+					"subnumbers": ["4"],
+					"chain": "Constantinople (test)"
+				}
+			}
+		},
+		{
+			"reference": "9590",
+			"failing": "stPreCompiledContracts",
+			"subtests": {
+				"modexp": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				}
+			}
+		},
+		{
+			"reference": "9590",
+			"failing": "stRevertTest",
+			"subtests": {
+				"LoopCallsDepthThenRevert3": {
+					"subnumbers": ["1"],
+					"chain": "Constantinople (test)"
+				},
+				"RevertOpcodeCreate": {
+					"subnumbers": ["1"],
+					"chain": "Constantinople (test)"
+				},
+				"RevertSubCallStorageOOG2": {
+					"subnumbers": ["1","3"],
+					"chain": "Constantinople (test)"
+				},
+				"RevertDepthCreateOOG": {
+					"subnumbers": ["3","4"],
+					"chain": "Constantinople (test)"
+				},
+				"RevertOpcodeMultipleSubCalls": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"RevertOpcodeDirectCall": {
+					"subnumbers": ["1","2"],
+					"chain": "Constantinople (test)"
+				},
+				"LoopCallsDepthThenRevert2": {
+					"subnumbers": ["1"],
+					"chain": "Constantinople (test)"
+				},
+				"RevertDepth2": {
+					"subnumbers": ["1"],
+					"chain": "Constantinople (test)"
+				},
+				"RevertRemoteSubCallStorageOOG2": {
+					"subnumbers": ["1","2"],
+					"chain": "Constantinople (test)"
+				},
+				"RevertDepthCreateAddressCollision": {
+					"subnumbers": ["3","4"],
+					"chain": "Constantinople (test)"
+				}
+			}
+		},
+		{
+			"reference": "9590",
+			"failing": "stStaticCall",
+			"subtests": {
+				"static_RevertDepth2": {
+					"subnumbers": ["1","3"],
+					"chain": "Constantinople (test)"
+				},
+				"static_CheckOpcodes4": {
+					"subnumbers": ["3"],
+					"chain": "Constantinople (test)"
+				},
+				"static_CheckOpcodes3": {
+					"subnumbers": ["5","6","7","8"],
+					"chain": "Constantinople (test)"
+				},
+				"static_callBasic": {
+					"subnumbers": ["1","2"],
+					"chain": "Constantinople (test)"
+				},
+				"static_CheckOpcodes2": {
+					"subnumbers": ["5","6","7","8"],
+					"chain": "Constantinople (test)"
+				},
+				"static_callCreate": {
+					"subnumbers": ["2"],
+					"chain": "Constantinople (test)"
+				}
+			}
+		},
+		{
+			"reference": "https://github.com/ethereum/tests/issues/512",
+			"failing": "stZeroKnowledge",
+			"subtests": {
+				"pointAddTrunc": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"pointAdd": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"pointMulAdd": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"pointMulAdd2": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				}
+			}
+		},
+		{
+			"reference": "9590",
+			"failing": "stCreate2Test",
+			"subtests": {
+				"call_then_create2_successful_then_returndatasize": {
+					"subnumbers": ["1"],
+					"chain": "Constantinople (test)"
+				},
+				"returndatacopy_afterFailing_create": {
+					"subnumbers": ["1"],
+					"chain": "Constantinople (test)"
+				},
+				"create2checkFieldsInInitcode": {
+					"subnumbers": ["1","2","3","5","6","7"],
+					"chain": "Constantinople (test)"
+				},
+				"Create2Recursive": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"create2collisionBalance": {
+					"subnumbers": ["2","3"],
+					"chain": "Constantinople (test)"
+				},
+				"create2InitCodes": {
+					"subnumbers": ["1","5","6","7","8","9"],
+					"chain": "Constantinople (test)"
+				},
+				"Create2OOGafterInitCode": {
+					"subnumbers": ["2"],
+					"chain": "Constantinople (test)"
+				},
+				"CreateMessageRevertedOOGInInit": {
+					"subnumbers": ["2"],
+					"chain": "Constantinople (test)"
+				},
+				"returndatacopy_following_revert_in_create": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"create2collisionSelfdestructed": {
+					"subnumbers": ["2"],
+					"chain": "Constantinople (test)"
+				},
+				"returndatacopy_0_0_following_successful_create": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"Create2OnDepth1023": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"Create2OOGafterInitCodeReturndata2": {
+					"subnumbers": ["2"],
+					"chain": "Constantinople (test)"
+				},
+				"RevertOpcodeInCreateReturns": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"CREATE2_ContractSuicideDuringInit_ThenStoreThenReturn": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"returndatasize_following_successful_create": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"call_outsize_then_create2_successful_then_returndatasize": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"CreateMessageReverted": {
+					"subnumbers": ["2"],
+					"chain": "Constantinople (test)"
+				},
+				"CREATE2_Suicide": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"Create2OOGafterInitCodeRevert": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"Create2OnDepth1024": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				},
+				"create2collisionStorage": {
+					"subnumbers": ["2","3"],
+					"chain": "Constantinople (test)"
+				},
+				"create2callPrecompiles": {
+					"subnumbers": ["*"],
+					"chain": "Constantinople (test)"
+				}
+			}
+		}
+	]
+}
diff --git a/ethcore/src/client/client.rs b/ethcore/src/client/client.rs
index 470c5361e02..e9b6f5b1662 100644
--- a/ethcore/src/client/client.rs
+++ b/ethcore/src/client/client.rs
@@ -52,7 +52,7 @@ use encoded;
 use engines::{EthEngine, EpochTransition, ForkChoice};
 use error::{
 	ImportErrorKind, BlockImportErrorKind, ExecutionError, CallError, BlockError, ImportResult,
-	QueueError, QueueErrorKind, Error as EthcoreError
+	QueueError, QueueErrorKind, Error as EthcoreError, EthcoreResult,
 };
 use vm::{EnvInfo, LastHashes};
 use evm::Schedule;
@@ -296,7 +296,6 @@ impl Importer {
 					continue;
 				}
 
-				let raw = block.bytes.clone();
 				match self.check_and_lock_block(block, client) {
 					Ok(closed_block) => {
 						if self.engine.is_proposal(&header) {
@@ -314,8 +313,8 @@ impl Importer {
 						}
 					},
 					Err(err) => {
-						self.bad_blocks.report(raw, format!("{:?}", err));
-						invalid_blocks.insert(header.hash());
+						self.bad_blocks.report(bytes, format!("{:?}", err));
+						invalid_blocks.insert(hash);
 					},
 				}
 			}
@@ -356,7 +355,7 @@ impl Importer {
 		imported
 	}
 
-	fn check_and_lock_block(&self, block: PreverifiedBlock, client: &Client) -> Result<LockedBlock, ()> {
+	fn check_and_lock_block(&self, block: PreverifiedBlock, client: &Client) -> EthcoreResult<LockedBlock> {
 		let engine = &*self.engine;
 		let header = block.header.clone();
 
@@ -364,7 +363,7 @@ impl Importer {
 		let best_block_number = client.chain.read().best_block_number();
 		if client.pruning_info().earliest_state > header.number() {
 			warn!(target: "client", "Block import failed for #{} ({})\nBlock is ancient (current best block: #{}).", header.number(), header.hash(), best_block_number);
-			return Err(());
+			bail!("Block is ancient");
 		}
 
 		// Check if parent is in chain
@@ -372,7 +371,7 @@ impl Importer {
 			Some(h) => h,
 			None => {
 				warn!(target: "client", "Block import failed for #{} ({}): Parent not found ({}) ", header.number(), header.hash(), header.parent_hash());
-				return Err(());
+				bail!("Parent not found");
 			}
 		};
 
@@ -391,13 +390,13 @@ impl Importer {
 
 		if let Err(e) = verify_family_result {
 			warn!(target: "client", "Stage 3 block verification failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
-			return Err(());
+			bail!(e);
 		};
 
 		let verify_external_result = self.verifier.verify_block_external(&header, engine);
 		if let Err(e) = verify_external_result {
 			warn!(target: "client", "Stage 4 block verification failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
-			return Err(());
+			bail!(e);
 		};
 
 		// Enact Verified Block
@@ -417,9 +416,13 @@ impl Importer {
 			&mut chain.ancestry_with_metadata_iter(*header.parent_hash()),
 		);
 
-		let mut locked_block = enact_result.map_err(|e| {
-			warn!(target: "client", "Block import failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
-		})?;
+		let mut locked_block = match enact_result {
+			Ok(b) => b,
+			Err(e) => {
+				warn!(target: "client", "Block import failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
+				bail!(e);
+			}
+		};
 
 		// Strip receipts for blocks before validate_receipts_transition,
 		// if the expected receipts root header does not match.
@@ -433,7 +436,7 @@ impl Importer {
 		// Final Verification
 		if let Err(e) = self.verifier.verify_block_final(&header, locked_block.block().header()) {
 			warn!(target: "client", "Stage 5 block verification failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
-			return Err(());
+			bail!(e);
 		}
 
 		Ok(locked_block)
@@ -443,7 +446,7 @@ impl Importer {
 	///
 	/// The block is guaranteed to be the next best blocks in the
 	/// first block sequence. Does no sealing or transaction validation.
-	fn import_old_block(&self, unverified: Unverified, receipts_bytes: &[u8], db: &KeyValueDB, chain: &BlockChain) -> Result<(), ::error::Error> {
+	fn import_old_block(&self, unverified: Unverified, receipts_bytes: &[u8], db: &KeyValueDB, chain: &BlockChain) -> EthcoreResult<()> {
 		let receipts = ::rlp::decode_list(receipts_bytes);
 		let _import_lock = self.import_lock.lock();
 
@@ -1153,7 +1156,8 @@ impl Client {
 			},
 		};
 
-		snapshot::take_snapshot(&*self.engine, &self.chain.read(), start_hash, db.as_hashdb(), writer, p)?;
+		let processing_threads = self.config.snapshot.processing_threads;
+		snapshot::take_snapshot(&*self.engine, &self.chain.read(), start_hash, db.as_hashdb(), writer, p, processing_threads)?;
 
 		Ok(())
 	}
@@ -1491,7 +1495,7 @@ impl Call for Client {
 		let sender = t.sender();
 		let options = || TransactOptions::with_tracing().dont_check_nonce();
 
-		let cond = |gas| {
+		let exec = |gas| {
 			let mut tx = t.as_unsigned().clone();
 			tx.gas = gas;
 			let tx = tx.fake_sign(sender);
@@ -1499,22 +1503,28 @@ impl Call for Client {
 			let mut clone = state.clone();
 			let machine = self.engine.machine();
 			let schedule = machine.schedule(env_info.number);
-			Ok(Executive::new(&mut clone, &env_info, &machine, &schedule)
+			Executive::new(&mut clone, &env_info, &machine, &schedule)
 				.transact_virtual(&tx, options())
+				.ok()
 				.map(|r| r.exception.is_none())
-				.unwrap_or(false))
 		};
 
-		if !cond(upper)? {
+		let cond = |gas| exec(gas).unwrap_or(false);
+
+		if !cond(upper) {
 			upper = max_upper;
-			if !cond(upper)? {
-				trace!(target: "estimate_gas", "estimate_gas failed with {}", upper);
-				let err = ExecutionError::Internal(format!("Requires higher than upper limit of {}", upper));
-				return Err(err.into())
+			match exec(upper) {
+				Some(false) => return Err(CallError::Exceptional),
+				None => {
+					trace!(target: "estimate_gas", "estimate_gas failed with {}", upper);
+					let err = ExecutionError::Internal(format!("Requires higher than upper limit of {}", upper));
+					return Err(err.into())
+				},
+				_ => {},
 			}
 		}
 		let lower = t.gas_required(&self.engine.schedule(env_info.number)).into();
-		if cond(lower)? {
+		if cond(lower) {
 			trace!(target: "estimate_gas", "estimate_gas succeeded with {}", lower);
 			return Ok(lower)
 		}
@@ -1523,12 +1533,12 @@ impl Call for Client {
 		/// Returns the lowest value between `lower` and `upper` for which `cond` returns true.
 		/// We assert: `cond(lower) = false`, `cond(upper) = true`
 		fn binary_chop<F, E>(mut lower: U256, mut upper: U256, mut cond: F) -> Result<U256, E>
-			where F: FnMut(U256) -> Result<bool, E>
+			where F: FnMut(U256) -> bool
 		{
 			while upper - lower > 1.into() {
 				let mid = (lower + upper) / 2;
 				trace!(target: "estimate_gas", "{} .. {} .. {}", lower, mid, upper);
-				let c = cond(mid)?;
+				let c = cond(mid);
 				match c {
 					true => upper = mid,
 					false => lower = mid,
@@ -2352,14 +2362,13 @@ impl ProvingBlockChainClient for Client {
 		env_info.gas_limit = transaction.gas.clone();
 		let mut jdb = self.state_db.read().journal_db().boxed_clone();
 
-		state::prove_transaction(
+		state::prove_transaction_virtual(
 			jdb.as_hashdb_mut(),
 			header.state_root().clone(),
 			&transaction,
 			self.engine.machine(),
 			&env_info,
 			self.factories.clone(),
-			false,
 		)
 	}
 
diff --git a/ethcore/src/client/config.rs b/ethcore/src/client/config.rs
index 40d2c4990f1..9567a499f74 100644
--- a/ethcore/src/client/config.rs
+++ b/ethcore/src/client/config.rs
@@ -19,6 +19,7 @@ use std::fmt::{Display, Formatter, Error as FmtError};
 
 use verification::{VerifierType, QueueConfig};
 use journaldb;
+use snapshot::SnapshotConfiguration;
 
 pub use std::time::Duration;
 pub use blockchain::Config as BlockChainConfig;
@@ -120,6 +121,8 @@ pub struct ClientConfig {
 	pub check_seal: bool,
 	/// Maximal number of transactions queued for verification in a separate thread.
 	pub transaction_verification_queue_size: usize,
+	/// Snapshot configuration
+	pub snapshot: SnapshotConfiguration,
 }
 
 impl Default for ClientConfig {
@@ -144,6 +147,7 @@ impl Default for ClientConfig {
 			history_mem: 32 * mb,
 			check_seal: true,
 			transaction_verification_queue_size: 8192,
+			snapshot: Default::default(),
 		}
 	}
 }
diff --git a/ethcore/src/client/test_client.rs b/ethcore/src/client/test_client.rs
index 81fbc4e6f71..09f00515e84 100644
--- a/ethcore/src/client/test_client.rs
+++ b/ethcore/src/client/test_client.rs
@@ -118,7 +118,7 @@ pub struct TestBlockChainClient {
 }
 
 /// Used for generating test client blocks.
-#[derive(Clone)]
+#[derive(Clone, Copy)]
 pub enum EachBlockWith {
 	/// Plain block.
 	Nothing,
@@ -242,69 +242,68 @@ impl TestBlockChainClient {
 		*self.error_on_logs.write() = val;
 	}
 
-	/// Add blocks to test client.
-	pub fn add_blocks(&self, count: usize, with: EachBlockWith) {
-		let len = self.numbers.read().len();
-		for n in len..(len + count) {
-			let mut header = BlockHeader::new();
-			header.set_difficulty(From::from(n));
-			header.set_parent_hash(self.last_hash.read().clone());
-			header.set_number(n as BlockNumber);
-			header.set_gas_limit(U256::from(1_000_000));
-			header.set_extra_data(self.extra_data.clone());
-			let uncles = match with {
-				EachBlockWith::Uncle | EachBlockWith::UncleAndTransaction => {
-					let mut uncles = RlpStream::new_list(1);
-					let mut uncle_header = BlockHeader::new();
-					uncle_header.set_difficulty(From::from(n));
-					uncle_header.set_parent_hash(self.last_hash.read().clone());
-					uncle_header.set_number(n as BlockNumber);
-					uncles.append(&uncle_header);
-					header.set_uncles_hash(keccak(uncles.as_raw()));
-					uncles
-				},
-				_ => RlpStream::new_list(0)
-			};
-			let txs = match with {
-				EachBlockWith::Transaction | EachBlockWith::UncleAndTransaction => {
-					let mut txs = RlpStream::new_list(1);
-					let keypair = Random.generate().unwrap();
-					// Update nonces value
-					self.nonces.write().insert(keypair.address(), U256::one());
-					let tx = Transaction {
-						action: Action::Create,
-						value: U256::from(100),
-						data: "3331600055".from_hex().unwrap(),
-						gas: U256::from(100_000),
-						gas_price: U256::from(200_000_000_000u64),
-						nonce: U256::zero()
-					};
-					let signed_tx = tx.sign(keypair.secret(), None);
-					txs.append(&signed_tx);
-					txs.out()
-				},
-				_ => ::rlp::EMPTY_LIST_RLP.to_vec()
-			};
-
-			let mut rlp = RlpStream::new_list(3);
-			rlp.append(&header);
-			rlp.append_raw(&txs, 1);
-			rlp.append_raw(uncles.as_raw(), 1);
-			let unverified = Unverified::from_rlp(rlp.out()).unwrap();
-			self.import_block(unverified).unwrap();
-		}
-	}
+	/// Add a block to test client.
+	pub fn add_block<F>(&self, with: EachBlockWith, hook: F)
+		where F: Fn(BlockHeader) -> BlockHeader
+	{
+		let n = self.numbers.read().len();
+
+		let mut header = BlockHeader::new();
+		header.set_difficulty(From::from(n));
+		header.set_parent_hash(self.last_hash.read().clone());
+		header.set_number(n as BlockNumber);
+		header.set_gas_limit(U256::from(1_000_000));
+		header.set_extra_data(self.extra_data.clone());
+
+		header = hook(header);
+
+		let uncles = match with {
+			EachBlockWith::Uncle | EachBlockWith::UncleAndTransaction => {
+				let mut uncles = RlpStream::new_list(1);
+				let mut uncle_header = BlockHeader::new();
+				uncle_header.set_difficulty(From::from(n));
+				uncle_header.set_parent_hash(self.last_hash.read().clone());
+				uncle_header.set_number(n as BlockNumber);
+				uncles.append(&uncle_header);
+				header.set_uncles_hash(keccak(uncles.as_raw()));
+				uncles
+			},
+			_ => RlpStream::new_list(0)
+		};
+		let txs = match with {
+			EachBlockWith::Transaction | EachBlockWith::UncleAndTransaction => {
+				let mut txs = RlpStream::new_list(1);
+				let keypair = Random.generate().unwrap();
+				// Update nonces value
+				self.nonces.write().insert(keypair.address(), U256::one());
+				let tx = Transaction {
+					action: Action::Create,
+					value: U256::from(100),
+					data: "3331600055".from_hex().unwrap(),
+					gas: U256::from(100_000),
+					gas_price: U256::from(200_000_000_000u64),
+					nonce: U256::zero()
+				};
+				let signed_tx = tx.sign(keypair.secret(), None);
+				txs.append(&signed_tx);
+				txs.out()
+			},
+			_ => ::rlp::EMPTY_LIST_RLP.to_vec()
+		};
 
-	/// Make a bad block by setting invalid extra data.
-	pub fn corrupt_block(&self, n: BlockNumber) {
-		let hash = self.block_hash(BlockId::Number(n)).unwrap();
-		let mut header: BlockHeader = self.block_header(BlockId::Number(n)).unwrap().decode().expect("decoding failed");
-		header.set_extra_data(b"This extra data is way too long to be considered valid".to_vec());
 		let mut rlp = RlpStream::new_list(3);
 		rlp.append(&header);
-		rlp.append_raw(&::rlp::NULL_RLP, 1);
-		rlp.append_raw(&::rlp::NULL_RLP, 1);
-		self.blocks.write().insert(hash, rlp.out());
+		rlp.append_raw(&txs, 1);
+		rlp.append_raw(uncles.as_raw(), 1);
+		let unverified = Unverified::from_rlp(rlp.out()).unwrap();
+		self.import_block(unverified).unwrap();
+	}
+
+	/// Add a sequence of blocks to test client.
+	pub fn add_blocks(&self, count: usize, with: EachBlockWith) {
+		for _ in 0..count {
+			self.add_block(with, |header| header);
+		}
 	}
 
 	/// Make a bad block by setting invalid parent hash.
diff --git a/ethcore/src/engines/authority_round/mod.rs b/ethcore/src/engines/authority_round/mod.rs
index 577c7b97f63..9e779677b0e 100644
--- a/ethcore/src/engines/authority_round/mod.rs
+++ b/ethcore/src/engines/authority_round/mod.rs
@@ -321,7 +321,7 @@ impl EmptyStep {
 
 impl fmt::Display for EmptyStep {
 	fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
-		write!(f, "({}, {}, {})", self.signature, self.step, self.parent_hash)
+		write!(f, "({:x}, {}, {:x})", self.signature, self.step, self.parent_hash)
 	}
 }
 
@@ -829,6 +829,10 @@ impl Engine<EthereumMachine> for AuthorityRound {
 
 	/// Additional engine-specific information for the user/developer concerning `header`.
 	fn extra_info(&self, header: &Header) -> BTreeMap<String, String> {
+		if header.seal().len() < header_expected_seal_fields(header, self.empty_steps_transition) {
+			return BTreeMap::default();
+		}
+
 		let step = header_step(header, self.empty_steps_transition).as_ref().map(ToString::to_string).unwrap_or("".into());
 		let signature = header_signature(header, self.empty_steps_transition).as_ref().map(ToString::to_string).unwrap_or("".into());
 
@@ -1403,10 +1407,12 @@ impl Engine<EthereumMachine> for AuthorityRound {
 
 #[cfg(test)]
 mod tests {
+	use std::collections::BTreeMap;
 	use std::sync::Arc;
 	use std::sync::atomic::{AtomicUsize, Ordering as AtomicOrdering};
 	use hash::keccak;
 	use ethereum_types::{Address, H520, H256, U256};
+	use ethkey::Signature;
 	use header::Header;
 	use rlp::encode;
 	use block::*;
@@ -2072,4 +2078,40 @@ mod tests {
 			addr1_balance + (1000 + 0) + (1000 + 2),
 		)
 	}
+
+	#[test]
+	fn extra_info_from_seal() {
+		let (spec, tap, accounts) = setup_empty_steps();
+		let engine = &*spec.engine;
+
+		let addr1 = accounts[0];
+		engine.set_signer(tap.clone(), addr1, "1".into());
+
+		let mut header: Header = Header::default();
+		let empty_step = empty_step(engine, 1, &header.parent_hash());
+		let sealed_empty_step = empty_step.sealed();
+
+		header.set_number(2);
+		header.set_seal(vec![
+			encode(&2usize).to_vec(),
+			encode(&H520::default()).to_vec(),
+			::rlp::encode_list(&vec![sealed_empty_step]).to_vec(),
+		]);
+
+		let info = engine.extra_info(&header);
+
+		let mut expected = BTreeMap::default();
+		expected.insert("step".into(), "2".into());
+		expected.insert("signature".into(), Signature::from(H520::default()).to_string());
+		expected.insert("emptySteps".into(), format!("[{}]", empty_step));
+
+		assert_eq!(info, expected);
+
+		header.set_seal(vec![]);
+
+		assert_eq!(
+			engine.extra_info(&header),
+			BTreeMap::default(),
+		);
+	}
 }
diff --git a/ethcore/src/engines/instant_seal.rs b/ethcore/src/engines/instant_seal.rs
index 80e9ea45169..c1b5de4ab5d 100644
--- a/ethcore/src/engines/instant_seal.rs
+++ b/ethcore/src/engines/instant_seal.rs
@@ -18,7 +18,7 @@ use engines::{Engine, Seal};
 use parity_machine::{Machine, Transactions, TotalScoredHeader};
 
 /// `InstantSeal` params.
-#[derive(Debug, PartialEq)]
+#[derive(Default, Debug, PartialEq)]
 pub struct InstantSealParams {
 	/// Whether to use millisecond timestamp
 	pub millisecond_timestamp: bool,
diff --git a/ethcore/src/engines/mod.rs b/ethcore/src/engines/mod.rs
index 424a9e94c91..0f5a9f4ccc0 100644
--- a/ethcore/src/engines/mod.rs
+++ b/ethcore/src/engines/mod.rs
@@ -32,7 +32,7 @@ pub mod epoch;
 pub use self::authority_round::AuthorityRound;
 pub use self::basic_authority::BasicAuthority;
 pub use self::epoch::{EpochVerifier, Transition as EpochTransition};
-pub use self::instant_seal::InstantSeal;
+pub use self::instant_seal::{InstantSeal, InstantSealParams};
 pub use self::null_engine::NullEngine;
 pub use self::tendermint::Tendermint;
 
@@ -44,7 +44,7 @@ use self::epoch::PendingTransition;
 
 use account_provider::AccountProvider;
 use builtin::Builtin;
-use vm::{EnvInfo, Schedule, CreateContractAddress};
+use vm::{EnvInfo, Schedule, CreateContractAddress, CallType, ActionValue};
 use error::Error;
 use header::{Header, BlockNumber};
 use snapshot::SnapshotComponents;
@@ -163,8 +163,10 @@ pub fn default_system_or_code_call<'a>(machine: &'a ::machine::EthereumMachine,
 					None,
 					Some(code),
 					Some(code_hash),
+					Some(ActionValue::Apparent(U256::zero())),
 					U256::max_value(),
 					Some(data),
+					Some(CallType::StaticCall),
 				)
 			},
 		};
diff --git a/ethcore/src/engines/tendermint/mod.rs b/ethcore/src/engines/tendermint/mod.rs
index 2d0015d06b2..70d78147e42 100644
--- a/ethcore/src/engines/tendermint/mod.rs
+++ b/ethcore/src/engines/tendermint/mod.rs
@@ -693,7 +693,6 @@ impl Engine<EthereumMachine> for Tendermint {
 	}
 
 	fn stop(&self) {
-		self.step_service.stop()
 	}
 
 	fn is_proposal(&self, header: &Header) -> bool {
diff --git a/ethcore/src/ethereum/mod.rs b/ethcore/src/ethereum/mod.rs
index 6d33e6d2d03..3336b8ba852 100644
--- a/ethcore/src/ethereum/mod.rs
+++ b/ethcore/src/ethereum/mod.rs
@@ -152,6 +152,9 @@ pub fn new_frontier_test_machine() -> EthereumMachine { load_machine(include_byt
 /// Create a new Foundation Homestead-era chain spec as though it never changed from Frontier.
 pub fn new_homestead_test_machine() -> EthereumMachine { load_machine(include_bytes!("../../res/ethereum/homestead_test.json")) }
 
+/// Create a new Foundation Homestead-EIP210-era chain spec as though it never changed from Homestead/Frontier.
+pub fn new_eip210_test_machine() -> EthereumMachine { load_machine(include_bytes!("../../res/ethereum/eip210_test.json")) }
+
 /// Create a new Foundation Byzantium era spec.
 pub fn new_byzantium_test_machine() -> EthereumMachine { load_machine(include_bytes!("../../res/ethereum/byzantium_test.json")) }
 
diff --git a/ethcore/src/executive.rs b/ethcore/src/executive.rs
index d2cf2f027fd..8bf58ecaeea 100644
--- a/ethcore/src/executive.rs
+++ b/ethcore/src/executive.rs
@@ -627,7 +627,8 @@ impl<'a, B: 'a + StateBackend> Executive<'a, B> {
 		let schedule = self.schedule;
 
 		// refunds from SSTORE nonzero -> zero
-		let sstore_refunds = substate.sstore_clears_refund;
+		assert!(substate.sstore_clears_refund >= 0, "On transaction level, sstore clears refund cannot go below zero.");
+		let sstore_refunds = U256::from(substate.sstore_clears_refund as u64);
 		// refunds from contract suicides
 		let suicide_refunds = U256::from(schedule.suicide_refund_gas) * U256::from(substate.suicides.len());
 		let refunds_bound = sstore_refunds + suicide_refunds;
@@ -1653,7 +1654,7 @@ mod tests {
 		let gas_used = gas - gas_left;
 		// sstore: 0 -> (1) -> () -> (1 -> 0 -> 1)
 		assert_eq!(gas_used, U256::from(41860));
-		assert_eq!(refund, U256::from(19800));
+		assert_eq!(refund, 19800);
 
 		assert_eq!(state.storage_at(&operating_address, &k).unwrap(), H256::from(U256::from(1)));
 		// Test a call via top-level -> y2 -> x2
@@ -1671,7 +1672,7 @@ mod tests {
 		let gas_used = gas - gas_left;
 		// sstore: 1 -> (1) -> () -> (0 -> 1 -> 0)
 		assert_eq!(gas_used, U256::from(11860));
-		assert_eq!(refund, U256::from(19800));
+		assert_eq!(refund, 19800);
 	}
 
 	fn wasm_sample_code() -> Arc<Vec<u8>> {
diff --git a/ethcore/src/externalities.rs b/ethcore/src/externalities.rs
index 5c7c95c6671..1152ee1d6ce 100644
--- a/ethcore/src/externalities.rs
+++ b/ethcore/src/externalities.rs
@@ -394,12 +394,12 @@ impl<'a, T: 'a, V: 'a, B: 'a> Ext for Externalities<'a, T, V, B>
 		self.depth
 	}
 
-	fn add_sstore_refund(&mut self, value: U256) {
-		self.substate.sstore_clears_refund = self.substate.sstore_clears_refund.saturating_add(value);
+	fn add_sstore_refund(&mut self, value: usize) {
+		self.substate.sstore_clears_refund += value as i128;
 	}
 
-	fn sub_sstore_refund(&mut self, value: U256) {
-		self.substate.sstore_clears_refund = self.substate.sstore_clears_refund.saturating_sub(value);
+	fn sub_sstore_refund(&mut self, value: usize) {
+		self.substate.sstore_clears_refund -= value as i128;
 	}
 
 	fn trace_next_instruction(&mut self, pc: usize, instruction: u8, current_gas: U256) -> bool {
diff --git a/ethcore/src/json_tests/difficulty.rs b/ethcore/src/json_tests/difficulty.rs
index 0de1f1777b7..23a85594552 100644
--- a/ethcore/src/json_tests/difficulty.rs
+++ b/ethcore/src/json_tests/difficulty.rs
@@ -95,10 +95,11 @@ mod difficulty_test_foundation {
 	declare_test!{DifficultyTests_difficultyMainNetwork, "BasicTests/difficultyMainNetwork.json"}
 }
 
-mod difficulty_test_ropsten {
-	difficulty_json_test_nopath!(new_ropsten_test);
-	declare_test!{DifficultyTests_difficultyRopsten, "BasicTests/difficultyRopsten.json"}
-}
+// Disabling Ropsten diff tests; waiting for upstream ethereum/tests Constantinople update
+//mod difficulty_test_ropsten {
+//	difficulty_json_test_nopath!(new_ropsten_test);
+//	declare_test!{DifficultyTests_difficultyRopsten, "BasicTests/difficultyRopsten.json"}
+//}
 
 mod difficulty_test_frontier {
 	difficulty_json_test_nopath!(new_frontier_test);
diff --git a/ethcore/src/json_tests/executive.rs b/ethcore/src/json_tests/executive.rs
index 78ef3e22dcf..b9774c2b100 100644
--- a/ethcore/src/json_tests/executive.rs
+++ b/ethcore/src/json_tests/executive.rs
@@ -209,11 +209,11 @@ impl<'a, T: 'a, V: 'a, B: 'a> Ext for TestExt<'a, T, V, B>
 		false
 	}
 
-	fn add_sstore_refund(&mut self, value: U256) {
+	fn add_sstore_refund(&mut self, value: usize) {
 		self.ext.add_sstore_refund(value)
 	}
 
-	fn sub_sstore_refund(&mut self, value: U256) {
+	fn sub_sstore_refund(&mut self, value: usize) {
 		self.ext.sub_sstore_refund(value)
 	}
 }
diff --git a/ethcore/src/machine.rs b/ethcore/src/machine.rs
index 8162408e92f..c74cc6bf4d1 100644
--- a/ethcore/src/machine.rs
+++ b/ethcore/src/machine.rs
@@ -135,8 +135,10 @@ impl EthereumMachine {
 			Some(contract_address),
 			code,
 			code_hash,
+			None,
 			gas,
-			data
+			data,
+			None,
 		)
 	}
 
@@ -149,8 +151,10 @@ impl EthereumMachine {
 		contract_address: Option<Address>,
 		code: Option<Arc<Vec<u8>>>,
 		code_hash: Option<H256>,
+		value: Option<ActionValue>,
 		gas: U256,
-		data: Option<Vec<u8>>
+		data: Option<Vec<u8>>,
+		call_type: Option<CallType>,
 	) -> Result<Vec<u8>, Error> {
 		let env_info = {
 			let mut env_info = block.env_info();
@@ -167,11 +171,11 @@ impl EthereumMachine {
 			origin: SYSTEM_ADDRESS,
 			gas,
 			gas_price: 0.into(),
-			value: ActionValue::Transfer(0.into()),
+			value: value.unwrap_or(ActionValue::Transfer(0.into())),
 			code,
 			code_hash,
 			data,
-			call_type: CallType::Call,
+			call_type: call_type.unwrap_or(CallType::Call),
 			params_type: ParamsType::Separate,
 		};
 		let schedule = self.schedule(env_info.number);
diff --git a/ethcore/src/snapshot/consensus/authority.rs b/ethcore/src/snapshot/consensus/authority.rs
index 72d828643dd..1e21d6fccee 100644
--- a/ethcore/src/snapshot/consensus/authority.rs
+++ b/ethcore/src/snapshot/consensus/authority.rs
@@ -30,7 +30,7 @@ use machine::EthereumMachine;
 use ids::BlockId;
 use header::Header;
 use receipt::Receipt;
-use snapshot::{Error, ManifestData};
+use snapshot::{Error, ManifestData, Progress};
 
 use itertools::{Position, Itertools};
 use rlp::{RlpStream, Rlp};
@@ -59,6 +59,7 @@ impl SnapshotComponents for PoaSnapshot {
 		chain: &BlockChain,
 		block_at: H256,
 		sink: &mut ChunkSink,
+		_progress: &Progress,
 		preferred_size: usize,
 	) -> Result<(), Error> {
 		let number = chain.block_number(&block_at)
diff --git a/ethcore/src/snapshot/consensus/mod.rs b/ethcore/src/snapshot/consensus/mod.rs
index 7b6b03a3ee2..ec14b2188d3 100644
--- a/ethcore/src/snapshot/consensus/mod.rs
+++ b/ethcore/src/snapshot/consensus/mod.rs
@@ -22,7 +22,7 @@ use std::sync::Arc;
 
 use blockchain::{BlockChain, BlockChainDB};
 use engines::EthEngine;
-use snapshot::{Error, ManifestData};
+use snapshot::{Error, ManifestData, Progress};
 
 use ethereum_types::H256;
 
@@ -49,6 +49,7 @@ pub trait SnapshotComponents: Send {
 		chain: &BlockChain,
 		block_at: H256,
 		chunk_sink: &mut ChunkSink,
+		progress: &Progress,
 		preferred_size: usize,
 	) -> Result<(), Error>;
 
diff --git a/ethcore/src/snapshot/consensus/work.rs b/ethcore/src/snapshot/consensus/work.rs
index ded004fe89f..b287ae9bb5f 100644
--- a/ethcore/src/snapshot/consensus/work.rs
+++ b/ethcore/src/snapshot/consensus/work.rs
@@ -28,7 +28,7 @@ use std::sync::Arc;
 
 use blockchain::{BlockChain, BlockChainDB, BlockProvider};
 use engines::EthEngine;
-use snapshot::{Error, ManifestData};
+use snapshot::{Error, ManifestData, Progress};
 use snapshot::block::AbridgedBlock;
 use ethereum_types::H256;
 use kvdb::KeyValueDB;
@@ -65,6 +65,7 @@ impl SnapshotComponents for PowSnapshot {
 		chain: &BlockChain,
 		block_at: H256,
 		chunk_sink: &mut ChunkSink,
+		progress: &Progress,
 		preferred_size: usize,
 	) -> Result<(), Error> {
 		PowWorker {
@@ -72,6 +73,7 @@ impl SnapshotComponents for PowSnapshot {
 			rlps: VecDeque::new(),
 			current_hash: block_at,
 			writer: chunk_sink,
+			progress: progress,
 			preferred_size: preferred_size,
 		}.chunk_all(self.blocks)
 	}
@@ -96,6 +98,7 @@ struct PowWorker<'a> {
 	rlps: VecDeque<Bytes>,
 	current_hash: H256,
 	writer: &'a mut ChunkSink<'a>,
+	progress: &'a Progress,
 	preferred_size: usize,
 }
 
@@ -138,6 +141,7 @@ impl<'a> PowWorker<'a> {
 
 			last = self.current_hash;
 			self.current_hash = block.header_view().parent_hash();
+			self.progress.blocks.fetch_add(1, Ordering::SeqCst);
 		}
 
 		if loaded_size != 0 {
diff --git a/ethcore/src/snapshot/mod.rs b/ethcore/src/snapshot/mod.rs
index 03f2eebfbf7..f05719e06b1 100644
--- a/ethcore/src/snapshot/mod.rs
+++ b/ethcore/src/snapshot/mod.rs
@@ -20,6 +20,7 @@
 //! https://wiki.parity.io/Warp-Sync-Snapshot-Format
 
 use std::collections::{HashMap, HashSet};
+use std::cmp;
 use std::sync::Arc;
 use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
 use hash::{keccak, KECCAK_NULL_RLP, KECCAK_EMPTY};
@@ -43,6 +44,7 @@ use trie::{Trie, TrieMut};
 use ethtrie::{TrieDB, TrieDBMut};
 use rlp::{RlpStream, Rlp};
 use bloom_journal::Bloom;
+use num_cpus;
 
 use self::io::SnapshotWriter;
 
@@ -88,6 +90,28 @@ const MAX_CHUNK_SIZE: usize = PREFERRED_CHUNK_SIZE / 4 * 5;
 const MIN_SUPPORTED_STATE_CHUNK_VERSION: u64 = 1;
 // current state chunk version.
 const STATE_CHUNK_VERSION: u64 = 2;
+/// number of snapshot subparts, must be a power of 2 in [1; 256]
+const SNAPSHOT_SUBPARTS: usize = 16;
+/// Maximum number of snapshot subparts (must be a multiple of `SNAPSHOT_SUBPARTS`)
+const MAX_SNAPSHOT_SUBPARTS: usize = 256;
+
+/// Configuration for the Snapshot service
+#[derive(Debug, Clone, PartialEq)]
+pub struct SnapshotConfiguration {
+	/// If `true`, no periodic snapshots will be created
+	pub no_periodic: bool,
+	/// Number of threads for creating snapshots
+	pub processing_threads: usize,
+}
+
+impl Default for SnapshotConfiguration {
+	fn default() -> Self {
+		SnapshotConfiguration {
+			no_periodic: false,
+			processing_threads: ::std::cmp::max(1, num_cpus::get() / 2),
+		}
+	}
+}
 
 /// A progress indicator for snapshots.
 #[derive(Debug, Default)]
@@ -130,7 +154,8 @@ pub fn take_snapshot<W: SnapshotWriter + Send>(
 	block_at: H256,
 	state_db: &HashDB<KeccakHasher>,
 	writer: W,
-	p: &Progress
+	p: &Progress,
+	processing_threads: usize,
 ) -> Result<(), Error> {
 	let start_header = chain.block_header_data(&block_at)
 		.ok_or(Error::InvalidStartingBlock(BlockId::Hash(block_at)))?;
@@ -142,17 +167,45 @@ pub fn take_snapshot<W: SnapshotWriter + Send>(
 	let writer = Mutex::new(writer);
 	let chunker = engine.snapshot_components().ok_or(Error::SnapshotsUnsupported)?;
 	let snapshot_version = chunker.current_version();
-	let (state_hashes, block_hashes) = scope(|scope| {
+	let (state_hashes, block_hashes) = scope(|scope| -> Result<(Vec<H256>, Vec<H256>), Error> {
 		let writer = &writer;
 		let block_guard = scope.spawn(move || chunk_secondary(chunker, chain, block_at, writer, p));
-		let state_res = chunk_state(state_db, &state_root, writer, p);
 
-		state_res.and_then(|state_hashes| {
-			block_guard.join().map(|block_hashes| (state_hashes, block_hashes))
-		})
+		// The number of threads must be between 1 and SNAPSHOT_SUBPARTS
+		assert!(processing_threads >= 1, "Cannot use less than 1 threads for creating snapshots");
+		let num_threads: usize = cmp::min(processing_threads, SNAPSHOT_SUBPARTS);
+		info!(target: "snapshot", "Using {} threads for Snapshot creation.", num_threads);
+
+		let mut state_guards = Vec::with_capacity(num_threads as usize);
+
+		for thread_idx in 0..num_threads {
+			let state_guard = scope.spawn(move || -> Result<Vec<H256>, Error> {
+				let mut chunk_hashes = Vec::new();
+
+				for part in (thread_idx..SNAPSHOT_SUBPARTS).step_by(num_threads) {
+					debug!(target: "snapshot", "Chunking part {} in thread {}", part, thread_idx);
+					let mut hashes = chunk_state(state_db, &state_root, writer, p, Some(part))?;
+					chunk_hashes.append(&mut hashes);
+				}
+
+				Ok(chunk_hashes)
+			});
+			state_guards.push(state_guard);
+		}
+
+		let block_hashes = block_guard.join()?;
+		let mut state_hashes = Vec::new();
+
+		for guard in state_guards {
+			let part_state_hashes = guard.join()?;
+			state_hashes.extend(part_state_hashes);
+		}
+
+		debug!(target: "snapshot", "Took a snapshot of {} accounts", p.accounts.load(Ordering::SeqCst));
+		Ok((state_hashes, block_hashes))
 	})?;
 
-	info!("produced {} state chunks and {} block chunks.", state_hashes.len(), block_hashes.len());
+	info!(target: "snapshot", "produced {} state chunks and {} block chunks.", state_hashes.len(), block_hashes.len());
 
 	let manifest_data = ManifestData {
 		version: snapshot_version,
@@ -200,6 +253,7 @@ pub fn chunk_secondary<'a>(mut chunker: Box<SnapshotComponents>, chain: &'a Bloc
 			chain,
 			start_hash,
 			&mut chunk_sink,
+			progress,
 			PREFERRED_CHUNK_SIZE,
 		)?;
 	}
@@ -263,10 +317,12 @@ impl<'a> StateChunker<'a> {
 
 /// Walk the given state database starting from the given root,
 /// creating chunks and writing them out.
+/// `part` is a number between 0 and 15, which describe which part of
+/// the tree should be chunked.
 ///
 /// Returns a list of hashes of chunks created, or any error it may
 /// have encountered.
-pub fn chunk_state<'a>(db: &HashDB<KeccakHasher>, root: &H256, writer: &Mutex<SnapshotWriter + 'a>, progress: &'a Progress) -> Result<Vec<H256>, Error> {
+pub fn chunk_state<'a>(db: &HashDB<KeccakHasher>, root: &H256, writer: &Mutex<SnapshotWriter + 'a>, progress: &'a Progress, part: Option<usize>) -> Result<Vec<H256>, Error> {
 	let account_trie = TrieDB::new(db, &root)?;
 
 	let mut chunker = StateChunker {
@@ -281,11 +337,33 @@ pub fn chunk_state<'a>(db: &HashDB<KeccakHasher>, root: &H256, writer: &Mutex<Sn
 	let mut used_code = HashSet::new();
 
 	// account_key here is the address' hash.
-	for item in account_trie.iter()? {
+	let mut account_iter = account_trie.iter()?;
+
+	let mut seek_to = None;
+
+	if let Some(part) = part {
+		assert!(part < 16, "Wrong chunk state part number (must be <16) in snapshot creation.");
+
+		let part_offset = MAX_SNAPSHOT_SUBPARTS / SNAPSHOT_SUBPARTS;
+		let mut seek_from = vec![0; 32];
+		seek_from[0] = (part * part_offset) as u8;
+		account_iter.seek(&seek_from)?;
+
+		// Set the upper-bound, except for the last part
+		if part < SNAPSHOT_SUBPARTS - 1 {
+			seek_to = Some(((part + 1) * part_offset) as u8)
+		}
+	}
+
+	for item in account_iter {
 		let (account_key, account_data) = item?;
-		let account = ::rlp::decode(&*account_data)?;
 		let account_key_hash = H256::from_slice(&account_key);
 
+		if seek_to.map_or(false, |seek_to| account_key[0] >= seek_to) {
+			break;
+		}
+
+		let account = ::rlp::decode(&*account_data)?;
 		let account_db = AccountDB::from_hash(db, account_key_hash);
 
 		let fat_rlps = account::to_fat_rlps(&account_key_hash, &account, &account_db, &mut used_code, PREFERRED_CHUNK_SIZE - chunker.chunk_size(), PREFERRED_CHUNK_SIZE)?;
diff --git a/ethcore/src/snapshot/tests/state.rs b/ethcore/src/snapshot/tests/state.rs
index 12f19e8c27c..82cee2af088 100644
--- a/ethcore/src/snapshot/tests/state.rs
+++ b/ethcore/src/snapshot/tests/state.rs
@@ -22,7 +22,7 @@ use hash::{KECCAK_NULL_RLP, keccak};
 
 use basic_account::BasicAccount;
 use snapshot::account;
-use snapshot::{chunk_state, Error as SnapshotError, Progress, StateRebuilder};
+use snapshot::{chunk_state, Error as SnapshotError, Progress, StateRebuilder, SNAPSHOT_SUBPARTS};
 use snapshot::io::{PackedReader, PackedWriter, SnapshotReader, SnapshotWriter};
 use super::helpers::{compare_dbs, StateProducer};
 
@@ -53,7 +53,11 @@ fn snap_and_restore() {
 	let state_root = producer.state_root();
 	let writer = Mutex::new(PackedWriter::new(&snap_file).unwrap());
 
-	let state_hashes = chunk_state(&old_db, &state_root, &writer, &Progress::default()).unwrap();
+	let mut state_hashes = Vec::new();
+	for part in 0..SNAPSHOT_SUBPARTS {
+		let mut hashes = chunk_state(&old_db, &state_root, &writer, &Progress::default(), Some(part)).unwrap();
+		state_hashes.append(&mut hashes);
+	}
 
 	writer.into_inner().finish(::snapshot::ManifestData {
 		version: 2,
@@ -164,7 +168,7 @@ fn checks_flag() {
 	let state_root = producer.state_root();
 	let writer = Mutex::new(PackedWriter::new(&snap_file).unwrap());
 
-	let state_hashes = chunk_state(&old_db, &state_root, &writer, &Progress::default()).unwrap();
+	let state_hashes = chunk_state(&old_db, &state_root, &writer, &Progress::default(), None).unwrap();
 
 	writer.into_inner().finish(::snapshot::ManifestData {
 		version: 2,
diff --git a/ethcore/src/spec/spec.rs b/ethcore/src/spec/spec.rs
index aa5d9cd9b7d..00ef71459aa 100644
--- a/ethcore/src/spec/spec.rs
+++ b/ethcore/src/spec/spec.rs
@@ -33,7 +33,10 @@ use vm::{EnvInfo, CallType, ActionValue, ActionParams, ParamsType};
 
 use builtin::Builtin;
 use encoded;
-use engines::{EthEngine, NullEngine, InstantSeal, BasicAuthority, AuthorityRound, Tendermint, DEFAULT_BLOCKHASH_CONTRACT};
+use engines::{
+	EthEngine, NullEngine, InstantSeal, InstantSealParams, BasicAuthority,
+	AuthorityRound, Tendermint, DEFAULT_BLOCKHASH_CONTRACT
+};
 use error::Error;
 use executive::Executive;
 use factory::Factories;
@@ -596,7 +599,8 @@ impl Spec {
 		match engine_spec {
 			ethjson::spec::Engine::Null(null) => Arc::new(NullEngine::new(null.params.into(), machine)),
 			ethjson::spec::Engine::Ethash(ethash) => Arc::new(::ethereum::Ethash::new(spec_params.cache_dir, ethash.params.into(), machine, spec_params.optimization_setting)),
-			ethjson::spec::Engine::InstantSeal(instant_seal) => Arc::new(InstantSeal::new(instant_seal.params.into(), machine)),
+			ethjson::spec::Engine::InstantSeal(Some(instant_seal)) => Arc::new(InstantSeal::new(instant_seal.params.into(), machine)),
+			ethjson::spec::Engine::InstantSeal(None) => Arc::new(InstantSeal::new(InstantSealParams::default(), machine)),
 			ethjson::spec::Engine::BasicAuthority(basic_authority) => Arc::new(BasicAuthority::new(basic_authority.params.into(), machine)),
 			ethjson::spec::Engine::AuthorityRound(authority_round) => AuthorityRound::new(authority_round.params.into(), machine)
 				.expect("Failed to start AuthorityRound consensus engine."),
@@ -873,14 +877,13 @@ impl Spec {
 				data: d,
 			}.fake_sign(from);
 
-			let res = ::state::prove_transaction(
+			let res = ::state::prove_transaction_virtual(
 				db.as_hashdb_mut(),
 				*genesis.state_root(),
 				&tx,
 				self.engine.machine(),
 				&env_info,
 				factories.clone(),
-				true,
 			);
 
 			res.map(|(out, proof)| {
diff --git a/ethcore/src/state/mod.rs b/ethcore/src/state/mod.rs
index 98f877617d0..197496d4c76 100644
--- a/ethcore/src/state/mod.rs
+++ b/ethcore/src/state/mod.rs
@@ -224,17 +224,16 @@ pub fn check_proof(
 	}
 }
 
-/// Prove a transaction on the given state.
+/// Prove a `virtual` transaction on the given state.
 /// Returns `None` when the transacion could not be proved,
 /// and a proof otherwise.
-pub fn prove_transaction<H: AsHashDB<KeccakHasher> + Send + Sync>(
+pub fn prove_transaction_virtual<H: AsHashDB<KeccakHasher> + Send + Sync>(
 	db: H,
 	root: H256,
 	transaction: &SignedTransaction,
 	machine: &Machine,
 	env_info: &EnvInfo,
 	factories: Factories,
-	virt: bool,
 ) -> Option<(Bytes, Vec<DBValue>)> {
 	use self::backend::Proving;
 
@@ -252,7 +251,7 @@ pub fn prove_transaction<H: AsHashDB<KeccakHasher> + Send + Sync>(
 	};
 
 	let options = TransactOptions::with_no_tracing().dont_check_nonce().save_output_from_contract();
-	match state.execute(env_info, machine, transaction, options, virt) {
+	match state.execute(env_info, machine, transaction, options, true) {
 		Err(ExecutionError::Internal(_)) => None,
 		Err(e) => {
 			trace!(target: "state", "Proved call failed: {}", e);
diff --git a/ethcore/src/state/substate.rs b/ethcore/src/state/substate.rs
index 054b8b384bb..5565c8f91ee 100644
--- a/ethcore/src/state/substate.rs
+++ b/ethcore/src/state/substate.rs
@@ -16,7 +16,7 @@
 
 //! Execution environment substate.
 use std::collections::HashSet;
-use ethereum_types::{U256, Address};
+use ethereum_types::Address;
 use log_entry::LogEntry;
 use evm::{Schedule, CleanDustMode};
 use super::CleanupMode;
@@ -35,7 +35,7 @@ pub struct Substate {
 	pub logs: Vec<LogEntry>,
 
 	/// Refund counter of SSTORE.
-	pub sstore_clears_refund: U256,
+	pub sstore_clears_refund: i128,
 
 	/// Created contracts.
 	pub contracts_created: Vec<Address>,
@@ -52,7 +52,7 @@ impl Substate {
 		self.suicides.extend(s.suicides);
 		self.touched.extend(s.touched);
 		self.logs.extend(s.logs);
-		self.sstore_clears_refund = self.sstore_clears_refund + s.sstore_clears_refund;
+		self.sstore_clears_refund += s.sstore_clears_refund;
 		self.contracts_created.extend(s.contracts_created);
 	}
 
diff --git a/ethcore/src/tests/evm.rs b/ethcore/src/tests/evm.rs
index 7befa47f67b..25ca8afd09e 100644
--- a/ethcore/src/tests/evm.rs
+++ b/ethcore/src/tests/evm.rs
@@ -38,7 +38,7 @@ fn test_blockhash_eip210(factory: Factory) {
 	let test_blockhash_contract = "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";
 	let blockhash_contract_code = Arc::new(test_blockhash_contract.from_hex().unwrap());
 	let blockhash_contract_code_hash = keccak(blockhash_contract_code.as_ref());
-	let machine = ::ethereum::new_constantinople_test_machine();
+	let machine = ::ethereum::new_eip210_test_machine();
 	let mut env_info = EnvInfo::default();
 
 	// populate state with 256 last hashes
diff --git a/ethcore/src/verification/queue/mod.rs b/ethcore/src/verification/queue/mod.rs
index 41b82d0f657..d1c29d7abcb 100644
--- a/ethcore/src/verification/queue/mod.rs
+++ b/ethcore/src/verification/queue/mod.rs
@@ -465,19 +465,19 @@ impl<K: Kind> VerificationQueue<K> {
 
 	/// Add a block to the queue.
 	pub fn import(&self, input: K::Input) -> ImportResult {
-		let h = input.hash();
+		let hash = input.hash();
 		{
-			if self.processing.read().contains_key(&h) {
+			if self.processing.read().contains_key(&hash) {
 				bail!(ErrorKind::Import(ImportErrorKind::AlreadyQueued));
 			}
 
 			let mut bad = self.verification.bad.lock();
-			if bad.contains(&h) {
+			if bad.contains(&hash) {
 				bail!(ErrorKind::Import(ImportErrorKind::KnownBad));
 			}
 
 			if bad.contains(&input.parent_hash()) {
-				bad.insert(h.clone());
+				bad.insert(hash);
 				bail!(ErrorKind::Import(ImportErrorKind::KnownBad));
 			}
 		}
@@ -486,21 +486,21 @@ impl<K: Kind> VerificationQueue<K> {
 			Ok(item) => {
 				self.verification.sizes.unverified.fetch_add(item.heap_size_of_children(), AtomicOrdering::SeqCst);
 
-				self.processing.write().insert(h.clone(), item.difficulty());
+				self.processing.write().insert(hash, item.difficulty());
 				{
 					let mut td = self.total_difficulty.write();
 					*td = *td + item.difficulty();
 				}
 				self.verification.unverified.lock().push_back(item);
 				self.more_to_verify.notify_all();
-				Ok(h)
+				Ok(hash)
 			},
 			Err(err) => {
 				match err {
 					// Don't mark future blocks as bad.
 					Error(ErrorKind::Block(BlockError::TemporarilyInvalid(_)), _) => {},
 					_ => {
-						self.verification.bad.lock().insert(h.clone());
+						self.verification.bad.lock().insert(hash);
 					}
 				}
 				Err(err)
diff --git a/ethcore/src/verification/verification.rs b/ethcore/src/verification/verification.rs
index cc1ee1ad6d1..cae9815f67d 100644
--- a/ethcore/src/verification/verification.rs
+++ b/ethcore/src/verification/verification.rs
@@ -245,15 +245,15 @@ fn verify_uncles(block: &PreverifiedBlock, bc: &BlockProvider, engine: &EthEngin
 
 /// Phase 4 verification. Check block information against transaction enactment results,
 pub fn verify_block_final(expected: &Header, got: &Header) -> Result<(), Error> {
+	if expected.state_root() != got.state_root() {
+		return Err(From::from(BlockError::InvalidStateRoot(Mismatch { expected: expected.state_root().clone(), found: got.state_root().clone() })))
+	}
 	if expected.gas_used() != got.gas_used() {
 		return Err(From::from(BlockError::InvalidGasUsed(Mismatch { expected: expected.gas_used().clone(), found: got.gas_used().clone() })))
 	}
 	if expected.log_bloom() != got.log_bloom() {
 		return Err(From::from(BlockError::InvalidLogBloom(Mismatch { expected: expected.log_bloom().clone(), found: got.log_bloom().clone() })))
 	}
-	if expected.state_root() != got.state_root() {
-		return Err(From::from(BlockError::InvalidStateRoot(Mismatch { expected: expected.state_root().clone(), found: got.state_root().clone() })))
-	}
 	if expected.receipts_root() != got.receipts_root() {
 		return Err(From::from(BlockError::InvalidReceiptsRoot(Mismatch { expected: expected.receipts_root().clone(), found: got.receipts_root().clone() })))
 	}
diff --git a/ethcore/sync/src/block_sync.rs b/ethcore/sync/src/block_sync.rs
index 55b23cba4d1..7cca71b026e 100644
--- a/ethcore/sync/src/block_sync.rs
+++ b/ethcore/sync/src/block_sync.rs
@@ -28,6 +28,7 @@ use ethcore::client::{BlockStatus, BlockId, BlockImportError, BlockImportErrorKi
 use ethcore::error::{ImportErrorKind, QueueErrorKind, BlockError};
 use sync_io::SyncIo;
 use blocks::{BlockCollection, SyncBody, SyncHeader};
+use chain::BlockSet;
 
 const MAX_HEADERS_TO_REQUEST: usize = 128;
 const MAX_BODIES_TO_REQUEST: usize = 32;
@@ -35,6 +36,26 @@ const MAX_RECEPITS_TO_REQUEST: usize = 128;
 const SUBCHAIN_SIZE: u64 = 256;
 const MAX_ROUND_PARENTS: usize = 16;
 const MAX_PARALLEL_SUBCHAIN_DOWNLOAD: usize = 5;
+const MAX_USELESS_HEADERS_PER_ROUND: usize = 3;
+
+// logging macros prepend BlockSet context for log filtering
+macro_rules! trace_sync {
+	($self:ident, $fmt:expr, $($arg:tt)+) => {
+		trace!(target: "sync", concat!("{:?}: ", $fmt), $self.block_set, $($arg)+);
+	};
+	($self:ident, $fmt:expr) => {
+		trace!(target: "sync", concat!("{:?}: ", $fmt), $self.block_set);
+	};
+}
+
+macro_rules! debug_sync {
+	($self:ident, $fmt:expr, $($arg:tt)+) => {
+		debug!(target: "sync", concat!("{:?}: ", $fmt), $self.block_set, $($arg)+);
+	};
+	($self:ident, $fmt:expr) => {
+		debug!(target: "sync", concat!("{:?}: ", $fmt), $self.block_set);
+	};
+}
 
 #[derive(Copy, Clone, Eq, PartialEq, Debug)]
 /// Downloader state
@@ -65,6 +86,7 @@ pub enum BlockRequest {
 }
 
 /// Indicates sync action
+#[derive(Eq, PartialEq, Debug)]
 pub enum DownloadAction {
 	/// Do nothing
 	None,
@@ -89,15 +111,17 @@ impl From<rlp::DecoderError> for BlockDownloaderImportError {
 /// Block downloader strategy.
 /// Manages state and block data for a block download process.
 pub struct BlockDownloader {
+	/// Which set of blocks to download
+	block_set: BlockSet,
 	/// Downloader state
 	state: State,
 	/// Highest block number seen
 	highest_block: Option<BlockNumber>,
 	/// Downloaded blocks, holds `H`, `B` and `S`
 	blocks: BlockCollection,
-	/// Last impoted block number
+	/// Last imported block number
 	last_imported_block: BlockNumber,
-	/// Last impoted block hash
+	/// Last imported block hash
 	last_imported_hash: H256,
 	/// Number of blocks imported this round
 	imported_this_round: Option<usize>,
@@ -112,15 +136,20 @@ pub struct BlockDownloader {
 	target_hash: Option<H256>,
 	/// Probing range for seeking common best block.
 	retract_step: u64,
-	/// Whether reorg should be limited.
-	limit_reorg: bool,
+	/// consecutive useless headers this round
+	useless_headers_count: usize,
 }
 
 impl BlockDownloader {
-	/// Create a new instance of syncing strategy. This won't reorganize to before the
-	/// last kept state.
-	pub fn new(sync_receipts: bool, start_hash: &H256, start_number: BlockNumber) -> Self {
+	/// Create a new instance of syncing strategy.
+	/// For BlockSet::NewBlocks this won't reorganize to before the last kept state.
+	pub fn new(block_set: BlockSet, start_hash: &H256, start_number: BlockNumber) -> Self {
+		let sync_receipts = match block_set {
+			BlockSet::NewBlocks => false,
+			BlockSet::OldBlocks => true
+		};
 		BlockDownloader {
+			block_set,
 			state: State::Idle,
 			highest_block: None,
 			last_imported_block: start_number,
@@ -133,32 +162,14 @@ impl BlockDownloader {
 			download_receipts: sync_receipts,
 			target_hash: None,
 			retract_step: 1,
-			limit_reorg: true,
-		}
-	}
-
-	/// Create a new instance of sync with unlimited reorg allowed.
-	pub fn with_unlimited_reorg(sync_receipts: bool, start_hash: &H256, start_number: BlockNumber) -> Self {
-		BlockDownloader {
-			state: State::Idle,
-			highest_block: None,
-			last_imported_block: start_number,
-			last_imported_hash: start_hash.clone(),
-			last_round_start: start_number,
-			last_round_start_hash: start_hash.clone(),
-			blocks: BlockCollection::new(sync_receipts),
-			imported_this_round: None,
-			round_parents: VecDeque::new(),
-			download_receipts: sync_receipts,
-			target_hash: None,
-			retract_step: 1,
-			limit_reorg: false,
+			useless_headers_count: 0,
 		}
 	}
 
 	/// Reset sync. Clear all local downloaded data.
 	pub fn reset(&mut self) {
 		self.blocks.clear();
+		self.useless_headers_count = 0;
 		self.state = State::Idle;
 	}
 
@@ -220,45 +231,65 @@ impl BlockDownloader {
 	}
 
 	/// Add new block headers.
-	pub fn import_headers(&mut self, io: &mut SyncIo, r: &Rlp, expected_hash: Option<H256>) -> Result<DownloadAction, BlockDownloaderImportError> {
+	pub fn import_headers(&mut self, io: &mut SyncIo, r: &Rlp, expected_hash: H256) -> Result<DownloadAction, BlockDownloaderImportError> {
 		let item_count = r.item_count().unwrap_or(0);
 		if self.state == State::Idle {
-			trace!(target: "sync", "Ignored unexpected block headers");
+			trace_sync!(self, "Ignored unexpected block headers");
 			return Ok(DownloadAction::None)
 		}
 		if item_count == 0 && (self.state == State::Blocks) {
 			return Err(BlockDownloaderImportError::Invalid);
 		}
 
+		// The request is generated in ::request_blocks.
+		let (max_count, skip) = if self.state == State::ChainHead {
+			(SUBCHAIN_SIZE as usize, (MAX_HEADERS_TO_REQUEST - 2) as u64)
+		} else {
+			(MAX_HEADERS_TO_REQUEST, 0)
+		};
+
+		if item_count > max_count {
+			debug!(target: "sync", "Headers response is larger than expected");
+			return Err(BlockDownloaderImportError::Invalid);
+		}
+
 		let mut headers = Vec::new();
 		let mut hashes = Vec::new();
-		let mut valid_response = item_count == 0; //empty response is valid
-		let mut any_known = false;
+		let mut last_header = None;
 		for i in 0..item_count {
 			let info = SyncHeader::from_rlp(r.at(i)?.as_raw().to_vec())?;
 			let number = BlockNumber::from(info.header.number());
 			let hash = info.header.hash();
-			// Check if any of the headers matches the hash we requested
-			if !valid_response {
-				if let Some(expected) = expected_hash {
-					valid_response = expected == hash;
+
+			let valid_response = match last_header {
+				// First header must match expected hash.
+				None => expected_hash == hash,
+				Some((last_number, last_hash)) => {
+					// Subsequent headers must be spaced by skip interval.
+					let skip_valid = number == last_number + skip + 1;
+					// Consecutive headers must be linked by parent hash.
+					let parent_valid = (number != last_number + 1) || *info.header.parent_hash() == last_hash;
+					skip_valid && parent_valid
 				}
+			};
+
+			// Disable the peer for this syncing round if it gives invalid chain
+			if !valid_response {
+				debug!(target: "sync", "Invalid headers response");
+				return Err(BlockDownloaderImportError::Invalid);
 			}
-			any_known = any_known || self.blocks.contains_head(&hash);
+
+			last_header = Some((number, hash));
 			if self.blocks.contains(&hash) {
-				trace!(target: "sync", "Skipping existing block header {} ({:?})", number, hash);
+				trace_sync!(self, "Skipping existing block header {} ({:?})", number, hash);
 				continue;
 			}
 
-			if self.highest_block.as_ref().map_or(true, |n| number > *n) {
-				self.highest_block = Some(number);
-			}
-
 			match io.chain().block_status(BlockId::Hash(hash.clone())) {
 				BlockStatus::InChain | BlockStatus::Queued => {
 					match self.state {
-						State::Blocks => trace!(target: "sync", "Header already in chain {} ({})", number, hash),
-						_ => trace!(target: "sync", "Header already in chain {} ({}), state = {:?}", number, hash, self.state),
+						State::Blocks => trace_sync!(self, "Header already in chain {} ({})", number, hash),
+						_ => trace_sync!(self, "Header already in chain {} ({}), state = {:?}", number, hash, self.state),
 					}
 					headers.push(info);
 					hashes.push(hash);
@@ -273,53 +304,67 @@ impl BlockDownloader {
 			}
 		}
 
-		// Disable the peer for this syncing round if it gives invalid chain
-		if !valid_response {
-			trace!(target: "sync", "Invalid headers response");
-			return Err(BlockDownloaderImportError::Invalid);
+		if let Some((number, _)) = last_header {
+			if self.highest_block.as_ref().map_or(true, |n| number > *n) {
+				self.highest_block = Some(number);
+			}
 		}
 
 		match self.state {
 			State::ChainHead => {
 				if !headers.is_empty() {
-					// TODO: validate heads better. E.g. check that there is enough distance between blocks.
-					trace!(target: "sync", "Received {} subchain heads, proceeding to download", headers.len());
+					trace_sync!(self, "Received {} subchain heads, proceeding to download", headers.len());
 					self.blocks.reset_to(hashes);
 					self.state = State::Blocks;
 					return Ok(DownloadAction::Reset);
 				} else {
+					trace_sync!(self, "No useful subchain heads received, expected hash {:?}", expected_hash);
 					let best = io.chain().chain_info().best_block_number;
 					let oldest_reorg = io.chain().pruning_info().earliest_state;
 					let last = self.last_imported_block;
-					if self.limit_reorg && best > last && (last == 0 || last < oldest_reorg) {
-						trace!(target: "sync", "No common block, disabling peer");
-						return Err(BlockDownloaderImportError::Invalid);
+					match self.block_set {
+						BlockSet::NewBlocks if best > last && (last == 0 || last < oldest_reorg) => {
+							trace_sync!(self, "No common block, disabling peer");
+							return Err(BlockDownloaderImportError::Invalid)
+						},
+						BlockSet::OldBlocks => {
+							trace_sync!(self, "Expected some useful headers for downloading OldBlocks. Try a different peer");
+							return Err(BlockDownloaderImportError::Useless)
+						},
+						_ => (),
 					}
 				}
 			},
 			State::Blocks => {
 				let count = headers.len();
-				// At least one of the heades must advance the subchain. Otherwise they are all useless.
-				if count == 0 || !any_known {
-					trace!(target: "sync", "No useful headers");
+				// At least one of the headers must advance the subchain. Otherwise they are all useless.
+				if count == 0 {
+					self.useless_headers_count += 1;
+					trace_sync!(self, "No useful headers ({:?} this round), expected hash {:?}", self.useless_headers_count, expected_hash);
+					// only reset download if we have multiple subchain heads, to avoid unnecessary resets
+					// when we are at the head of the chain when we may legitimately receive no useful headers
+					if self.blocks.heads_len() > 1 && self.useless_headers_count >= MAX_USELESS_HEADERS_PER_ROUND {
+						trace_sync!(self, "Received {:?} useless responses this round. Resetting sync", MAX_USELESS_HEADERS_PER_ROUND);
+						self.reset();
+					}
 					return Err(BlockDownloaderImportError::Useless);
 				}
 				self.blocks.insert_headers(headers);
-				trace!(target: "sync", "Inserted {} headers", count);
+				trace_sync!(self, "Inserted {} headers", count);
 			},
-			_ => trace!(target: "sync", "Unexpected headers({})", headers.len()),
+			_ => trace_sync!(self, "Unexpected headers({})", headers.len()),
 		}
 
 		Ok(DownloadAction::None)
 	}
 
 	/// Called by peer once it has new block bodies
-	pub fn import_bodies(&mut self, r: &Rlp) -> Result<(), BlockDownloaderImportError> {
+	pub fn import_bodies(&mut self, r: &Rlp, expected_hashes: &[H256]) -> Result<(), BlockDownloaderImportError> {
 		let item_count = r.item_count().unwrap_or(0);
 		if item_count == 0 {
 			return Err(BlockDownloaderImportError::Useless);
 		} else if self.state != State::Blocks {
-			trace!(target: "sync", "Ignored unexpected block bodies");
+			trace_sync!(self, "Ignored unexpected block bodies");
 		} else {
 			let mut bodies = Vec::with_capacity(item_count);
 			for i in 0..item_count {
@@ -327,8 +372,13 @@ impl BlockDownloader {
 				bodies.push(body);
 			}
 
-			if self.blocks.insert_bodies(bodies) != item_count {
-				trace!(target: "sync", "Deactivating peer for giving invalid block bodies");
+			let hashes = self.blocks.insert_bodies(bodies);
+			if hashes.len() != item_count {
+				trace_sync!(self, "Deactivating peer for giving invalid block bodies");
+				return Err(BlockDownloaderImportError::Invalid);
+			}
+			if !all_expected(hashes.as_slice(), expected_hashes, |&a, &b| a == b) {
+				trace_sync!(self, "Deactivating peer for giving unexpected block bodies");
 				return Err(BlockDownloaderImportError::Invalid);
 			}
 		}
@@ -336,25 +386,30 @@ impl BlockDownloader {
 	}
 
 	/// Called by peer once it has new block bodies
-	pub fn import_receipts(&mut self, _io: &mut SyncIo, r: &Rlp) -> Result<(), BlockDownloaderImportError> {
+	pub fn import_receipts(&mut self, r: &Rlp, expected_hashes: &[H256]) -> Result<(), BlockDownloaderImportError> {
 		let item_count = r.item_count().unwrap_or(0);
 		if item_count == 0 {
 			return Err(BlockDownloaderImportError::Useless);
 		}
 		else if self.state != State::Blocks {
-			trace!(target: "sync", "Ignored unexpected block receipts");
+			trace_sync!(self, "Ignored unexpected block receipts");
 		}
 		else {
 			let mut receipts = Vec::with_capacity(item_count);
 			for i in 0..item_count {
 				let receipt = r.at(i).map_err(|e| {
-					trace!(target: "sync", "Error decoding block receipts RLP: {:?}", e);
+					trace_sync!(self, "Error decoding block receipts RLP: {:?}", e);
 					BlockDownloaderImportError::Invalid
 				})?;
 				receipts.push(receipt.as_raw().to_vec());
 			}
-			if self.blocks.insert_receipts(receipts) != item_count {
-				trace!(target: "sync", "Deactivating peer for giving invalid block receipts");
+			let hashes = self.blocks.insert_receipts(receipts);
+			if hashes.len() != item_count {
+				trace_sync!(self, "Deactivating peer for giving invalid block receipts");
+				return Err(BlockDownloaderImportError::Invalid);
+			}
+			if !all_expected(hashes.as_slice(), expected_hashes, |a, b| a.contains(b)) {
+				trace_sync!(self, "Deactivating peer for giving unexpected block receipts");
 				return Err(BlockDownloaderImportError::Invalid);
 			}
 		}
@@ -363,7 +418,7 @@ impl BlockDownloader {
 
 	fn start_sync_round(&mut self, io: &mut SyncIo) {
 		self.state = State::ChainHead;
-		trace!(target: "sync", "Starting round (last imported count = {:?}, last started = {}, block = {:?}", self.imported_this_round, self.last_round_start, self.last_imported_block);
+		trace_sync!(self, "Starting round (last imported count = {:?}, last started = {}, block = {:?}", self.imported_this_round, self.last_round_start, self.last_imported_block);
 		// Check if need to retract to find the common block. The problem is that the peers still return headers by hash even
 		// from the non-canonical part of the tree. So we also retract if nothing has been imported last round.
 		let start = self.last_round_start;
@@ -375,12 +430,12 @@ impl BlockDownloader {
 				if let Some(&(_, p)) = self.round_parents.iter().find(|&&(h, _)| h == start_hash) {
 					self.last_imported_block = start - 1;
 					self.last_imported_hash = p.clone();
-					trace!(target: "sync", "Searching common header from the last round {} ({})", self.last_imported_block, self.last_imported_hash);
+					trace_sync!(self, "Searching common header from the last round {} ({})", self.last_imported_block, self.last_imported_hash);
 				} else {
 					let best = io.chain().chain_info().best_block_number;
 					let oldest_reorg = io.chain().pruning_info().earliest_state;
-					if self.limit_reorg && best > start && start < oldest_reorg {
-						debug!(target: "sync", "Could not revert to previous ancient block, last: {} ({})", start, start_hash);
+					if self.block_set == BlockSet::NewBlocks && best > start && start < oldest_reorg {
+						debug_sync!(self, "Could not revert to previous ancient block, last: {} ({})", start, start_hash);
 						self.reset();
 					} else {
 						let n = start - cmp::min(self.retract_step, start);
@@ -389,10 +444,10 @@ impl BlockDownloader {
 							Some(h) => {
 								self.last_imported_block = n;
 								self.last_imported_hash = h;
-								trace!(target: "sync", "Searching common header in the blockchain {} ({})", start, self.last_imported_hash);
+								trace_sync!(self, "Searching common header in the blockchain {} ({})", start, self.last_imported_hash);
 							}
 							None => {
-								debug!(target: "sync", "Could not revert to previous block, last: {} ({})", start, self.last_imported_hash);
+								debug_sync!(self, "Could not revert to previous block, last: {} ({})", start, self.last_imported_hash);
 								self.reset();
 							}
 						}
@@ -420,7 +475,7 @@ impl BlockDownloader {
 			State::ChainHead => {
 				if num_active_peers < MAX_PARALLEL_SUBCHAIN_DOWNLOAD {
 					// Request subchain headers
-					trace!(target: "sync", "Starting sync with better chain");
+					trace_sync!(self, "Starting sync with better chain");
 					// Request MAX_HEADERS_TO_REQUEST - 2 headers apart so that
 					// MAX_HEADERS_TO_REQUEST would include headers for neighbouring subchains
 					return Some(BlockRequest::Headers {
@@ -463,8 +518,9 @@ impl BlockDownloader {
 	}
 
 	/// Checks if there are blocks fully downloaded that can be imported into the blockchain and does the import.
-	pub fn collect_blocks(&mut self, io: &mut SyncIo, allow_out_of_order: bool) -> Result<(), BlockDownloaderImportError> {
-		let mut bad = false;
+	/// Returns DownloadAction::Reset if it is imported all the the blocks it can and all downloading peers should be reset
+	pub fn collect_blocks(&mut self, io: &mut SyncIo, allow_out_of_order: bool) -> DownloadAction {
+		let mut download_action = DownloadAction::None;
 		let mut imported = HashSet::new();
 		let blocks = self.blocks.drain();
 		let count = blocks.len();
@@ -478,8 +534,8 @@ impl BlockDownloader {
 
 			if self.target_hash.as_ref().map_or(false, |t| t == &h) {
 				self.state = State::Complete;
-				trace!(target: "sync", "Sync target reached");
-				return Ok(());
+				trace_sync!(self, "Sync target reached");
+				return download_action;
 			}
 
 			let result = if let Some(receipts) = receipts {
@@ -490,15 +546,15 @@ impl BlockDownloader {
 
 			match result {
 				Err(BlockImportError(BlockImportErrorKind::Import(ImportErrorKind::AlreadyInChain), _)) => {
-					trace!(target: "sync", "Block already in chain {:?}", h);
+					trace_sync!(self, "Block already in chain {:?}", h);
 					self.block_imported(&h, number, &parent);
 				},
 				Err(BlockImportError(BlockImportErrorKind::Import(ImportErrorKind::AlreadyQueued), _)) => {
-					trace!(target: "sync", "Block already queued {:?}", h);
+					trace_sync!(self, "Block already queued {:?}", h);
 					self.block_imported(&h, number, &parent);
 				},
 				Ok(_) => {
-					trace!(target: "sync", "Block queued {:?}", h);
+					trace_sync!(self, "Block queued {:?}", h);
 					imported.insert(h.clone());
 					self.block_imported(&h, number, &parent);
 				},
@@ -506,37 +562,34 @@ impl BlockDownloader {
 					break;
 				},
 				Err(BlockImportError(BlockImportErrorKind::Block(BlockError::UnknownParent(_)), _)) => {
-					trace!(target: "sync", "Unknown new block parent, restarting sync");
+					trace_sync!(self, "Unknown new block parent, restarting sync");
 					break;
 				},
 				Err(BlockImportError(BlockImportErrorKind::Block(BlockError::TemporarilyInvalid(_)), _)) => {
-					debug!(target: "sync", "Block temporarily invalid, restarting sync");
+					debug_sync!(self, "Block temporarily invalid: {:?}, restarting sync", h);
 					break;
 				},
 				Err(BlockImportError(BlockImportErrorKind::Queue(QueueErrorKind::Full(limit)), _)) => {
-					debug!(target: "sync", "Block import queue full ({}), restarting sync", limit);
+					debug_sync!(self, "Block import queue full ({}), restarting sync", limit);
+					download_action = DownloadAction::Reset;
 					break;
 				},
 				Err(e) => {
-					debug!(target: "sync", "Bad block {:?} : {:?}", h, e);
-					bad = true;
+					debug_sync!(self, "Bad block {:?} : {:?}", h, e);
+					download_action = DownloadAction::Reset;
 					break;
 				}
 			}
 		}
-		trace!(target: "sync", "Imported {} of {}", imported.len(), count);
+		trace_sync!(self, "Imported {} of {}", imported.len(), count);
 		self.imported_this_round = Some(self.imported_this_round.unwrap_or(0) + imported.len());
 
-		if bad {
-			return Err(BlockDownloaderImportError::Invalid);
-		}
-
 		if self.blocks.is_empty() {
 			// complete sync round
-			trace!(target: "sync", "Sync round complete");
-			self.reset();
+			trace_sync!(self, "Sync round complete");
+			download_action = DownloadAction::Reset;
 		}
-		Ok(())
+		download_action
 	}
 
 	fn block_imported(&mut self, hash: &H256, number: BlockNumber, parent: &H256) {
@@ -549,4 +602,392 @@ impl BlockDownloader {
 	}
 }
 
-//TODO: module tests
+// Determines if the first argument matches an ordered subset of the second, according to some predicate.
+fn all_expected<A, B, F>(values: &[A], expected_values: &[B], is_expected: F) -> bool
+	where F: Fn(&A, &B) -> bool
+{
+	let mut expected_iter = expected_values.iter();
+	values.iter().all(|val1| {
+		while let Some(val2) = expected_iter.next() {
+			if is_expected(val1, val2) {
+				return true;
+			}
+		}
+		false
+	})
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use ethcore::client::TestBlockChainClient;
+	use ethcore::header::Header as BlockHeader;
+	use ethcore::spec::Spec;
+	use ethkey::{Generator,Random};
+	use hash::keccak;
+	use parking_lot::RwLock;
+	use rlp::{encode_list,RlpStream};
+	use tests::helpers::TestIo;
+	use tests::snapshot::TestSnapshotService;
+	use transaction::{Transaction,SignedTransaction};
+	use triehash_ethereum::ordered_trie_root;
+
+	fn dummy_header(number: u64, parent_hash: H256) -> BlockHeader {
+		let mut header = BlockHeader::new();
+		header.set_gas_limit(0.into());
+		header.set_difficulty((number * 100).into());
+		header.set_timestamp(number * 10);
+		header.set_number(number);
+		header.set_parent_hash(parent_hash);
+		header.set_state_root(H256::zero());
+		header
+	}
+
+	fn dummy_signed_tx() -> SignedTransaction {
+		let keypair = Random.generate().unwrap();
+		Transaction::default().sign(keypair.secret(), None)
+	}
+
+	fn import_headers(headers: &[BlockHeader], downloader: &mut BlockDownloader, io: &mut SyncIo) -> Result<DownloadAction, BlockDownloaderImportError> {
+		let mut stream = RlpStream::new();
+		stream.append_list(headers);
+		let bytes = stream.out();
+		let rlp = Rlp::new(&bytes);
+		let expected_hash = headers.first().unwrap().hash();
+		downloader.import_headers(io, &rlp, expected_hash)
+	}
+
+	fn import_headers_ok(headers: &[BlockHeader], downloader: &mut BlockDownloader, io: &mut SyncIo) {
+		let res = import_headers(headers, downloader, io);
+		assert!(res.is_ok());
+	}
+
+	#[test]
+	fn import_headers_in_chain_head_state() {
+		::env_logger::try_init().ok();
+
+		let spec = Spec::new_test();
+		let genesis_hash = spec.genesis_header().hash();
+
+		let mut downloader = BlockDownloader::new(BlockSet::NewBlocks, &genesis_hash, 0);
+		downloader.state = State::ChainHead;
+
+		let mut chain = TestBlockChainClient::new();
+		let snapshot_service = TestSnapshotService::new();
+		let queue = RwLock::new(VecDeque::new());
+		let mut io = TestIo::new(&mut chain, &snapshot_service, &queue, None);
+
+		// Valid headers sequence.
+		let valid_headers = [
+			spec.genesis_header(),
+			dummy_header(127, H256::random()),
+			dummy_header(254, H256::random()),
+		];
+		let rlp_data = encode_list(&valid_headers);
+		let valid_rlp = Rlp::new(&rlp_data);
+
+		match downloader.import_headers(&mut io, &valid_rlp, genesis_hash) {
+			Ok(DownloadAction::Reset) => assert_eq!(downloader.state, State::Blocks),
+			_ => panic!("expected transition to Blocks state"),
+		};
+
+		// Headers are rejected because the expected hash does not match.
+		let invalid_start_block_headers = [
+			dummy_header(0, H256::random()),
+			dummy_header(127, H256::random()),
+			dummy_header(254, H256::random()),
+		];
+		let rlp_data = encode_list(&invalid_start_block_headers);
+		let invalid_start_block_rlp = Rlp::new(&rlp_data);
+
+		match downloader.import_headers(&mut io, &invalid_start_block_rlp, genesis_hash) {
+			Err(BlockDownloaderImportError::Invalid) => (),
+			_ => panic!("expected BlockDownloaderImportError"),
+		};
+
+		// Headers are rejected because they are not spaced as expected.
+		let invalid_skip_headers = [
+			spec.genesis_header(),
+			dummy_header(128, H256::random()),
+			dummy_header(256, H256::random()),
+		];
+		let rlp_data = encode_list(&invalid_skip_headers);
+		let invalid_skip_rlp = Rlp::new(&rlp_data);
+
+		match downloader.import_headers(&mut io, &invalid_skip_rlp, genesis_hash) {
+			Err(BlockDownloaderImportError::Invalid) => (),
+			_ => panic!("expected BlockDownloaderImportError"),
+		};
+
+		// Invalid because the packet size is too large.
+		let mut too_many_headers = Vec::with_capacity((SUBCHAIN_SIZE + 1) as usize);
+		too_many_headers.push(spec.genesis_header());
+		for i in 1..(SUBCHAIN_SIZE + 1) {
+			too_many_headers.push(dummy_header((MAX_HEADERS_TO_REQUEST as u64 - 1) * i, H256::random()));
+		}
+		let rlp_data = encode_list(&too_many_headers);
+
+		let too_many_rlp = Rlp::new(&rlp_data);
+		match downloader.import_headers(&mut io, &too_many_rlp, genesis_hash) {
+			Err(BlockDownloaderImportError::Invalid) => (),
+			_ => panic!("expected BlockDownloaderImportError"),
+		};
+	}
+
+	#[test]
+	fn import_headers_in_blocks_state() {
+		::env_logger::try_init().ok();
+
+		let mut chain = TestBlockChainClient::new();
+		let snapshot_service = TestSnapshotService::new();
+		let queue = RwLock::new(VecDeque::new());
+		let mut io = TestIo::new(&mut chain, &snapshot_service, &queue, None);
+
+		let mut headers = Vec::with_capacity(3);
+		let parent_hash = H256::random();
+		headers.push(dummy_header(127, parent_hash));
+		let parent_hash = headers[0].hash();
+		headers.push(dummy_header(128, parent_hash));
+		let parent_hash = headers[1].hash();
+		headers.push(dummy_header(129, parent_hash));
+
+		let mut downloader = BlockDownloader::new(BlockSet::NewBlocks, &H256::random(), 0);
+		downloader.state = State::Blocks;
+		downloader.blocks.reset_to(vec![headers[0].hash()]);
+
+		let rlp_data = encode_list(&headers);
+		let headers_rlp = Rlp::new(&rlp_data);
+
+		match downloader.import_headers(&mut io, &headers_rlp, headers[0].hash()) {
+			Ok(DownloadAction::None) => (),
+			_ => panic!("expected successful import"),
+		};
+
+		// Invalidate parent_hash link.
+		headers[2] = dummy_header(129, H256::random());
+		let rlp_data = encode_list(&headers);
+		let headers_rlp = Rlp::new(&rlp_data);
+
+		match downloader.import_headers(&mut io, &headers_rlp, headers[0].hash()) {
+			Err(BlockDownloaderImportError::Invalid) => (),
+			_ => panic!("expected BlockDownloaderImportError"),
+		};
+
+		// Invalidate header sequence by skipping a header.
+		headers[2] = dummy_header(130, headers[1].hash());
+		let rlp_data = encode_list(&headers);
+		let headers_rlp = Rlp::new(&rlp_data);
+
+		match downloader.import_headers(&mut io, &headers_rlp, headers[0].hash()) {
+			Err(BlockDownloaderImportError::Invalid) => (),
+			_ => panic!("expected BlockDownloaderImportError"),
+		};
+	}
+
+	#[test]
+	fn import_bodies() {
+		::env_logger::try_init().ok();
+
+		let mut chain = TestBlockChainClient::new();
+		let snapshot_service = TestSnapshotService::new();
+		let queue = RwLock::new(VecDeque::new());
+		let mut io = TestIo::new(&mut chain, &snapshot_service, &queue, None);
+
+		// Import block headers.
+		let mut headers = Vec::with_capacity(4);
+		let mut bodies = Vec::with_capacity(4);
+		let mut parent_hash = H256::zero();
+		for i in 0..4 {
+			// Construct the block body
+			let mut uncles = if i > 0 {
+				encode_list(&[dummy_header(i - 1, H256::random())]).into_vec()
+			} else {
+				::rlp::EMPTY_LIST_RLP.to_vec()
+			};
+
+			let mut txs = encode_list(&[dummy_signed_tx()]);
+			let tx_root = ordered_trie_root(Rlp::new(&txs).iter().map(|r| r.as_raw()));
+
+			let mut rlp = RlpStream::new_list(2);
+			rlp.append_raw(&txs, 1);
+			rlp.append_raw(&uncles, 1);
+			bodies.push(rlp.out());
+
+			// Construct the block header
+			let mut header = dummy_header(i, parent_hash);
+			header.set_transactions_root(tx_root);
+			header.set_uncles_hash(keccak(&uncles));
+			parent_hash = header.hash();
+			headers.push(header);
+		}
+
+		let mut downloader = BlockDownloader::new(BlockSet::NewBlocks, &headers[0].hash(), 0);
+		downloader.state = State::Blocks;
+		downloader.blocks.reset_to(vec![headers[0].hash()]);
+
+		// Only import the first three block headers.
+		let rlp_data = encode_list(&headers[0..3]);
+		let headers_rlp = Rlp::new(&rlp_data);
+		assert!(downloader.import_headers(&mut io, &headers_rlp, headers[0].hash()).is_ok());
+
+		// Import first body successfully.
+		let mut rlp_data = RlpStream::new_list(1);
+		rlp_data.append_raw(&bodies[0], 1);
+		let bodies_rlp = Rlp::new(rlp_data.as_raw());
+		assert!(downloader.import_bodies(&bodies_rlp, &[headers[0].hash(), headers[1].hash()]).is_ok());
+
+		// Import second body successfully.
+		let mut rlp_data = RlpStream::new_list(1);
+		rlp_data.append_raw(&bodies[1], 1);
+		let bodies_rlp = Rlp::new(rlp_data.as_raw());
+		assert!(downloader.import_bodies(&bodies_rlp, &[headers[0].hash(), headers[1].hash()]).is_ok());
+
+		// Import unexpected third body.
+		let mut rlp_data = RlpStream::new_list(1);
+		rlp_data.append_raw(&bodies[2], 1);
+		let bodies_rlp = Rlp::new(rlp_data.as_raw());
+		match downloader.import_bodies(&bodies_rlp, &[headers[0].hash(), headers[1].hash()]) {
+			Err(BlockDownloaderImportError::Invalid) => (),
+			_ => panic!("expected BlockDownloaderImportError"),
+		};
+	}
+
+	#[test]
+	fn import_receipts() {
+		::env_logger::try_init().ok();
+
+		let mut chain = TestBlockChainClient::new();
+		let snapshot_service = TestSnapshotService::new();
+		let queue = RwLock::new(VecDeque::new());
+		let mut io = TestIo::new(&mut chain, &snapshot_service, &queue, None);
+
+		// Import block headers.
+		let mut headers = Vec::with_capacity(4);
+		let mut receipts = Vec::with_capacity(4);
+		let mut parent_hash = H256::zero();
+		for i in 0..4 {
+			// Construct the receipts. Receipt root for the first two blocks is the same.
+			//
+			// The RLP-encoded integers are clearly not receipts, but the BlockDownloader treats
+			// all receipts as byte blobs, so it does not matter.
+			let mut receipts_rlp = if i < 2 {
+				encode_list(&[0u32])
+			} else {
+				encode_list(&[i as u32])
+			};
+			let receipts_root = ordered_trie_root(Rlp::new(&receipts_rlp).iter().map(|r| r.as_raw()));
+			receipts.push(receipts_rlp);
+
+			// Construct the block header.
+			let mut header = dummy_header(i, parent_hash);
+			header.set_receipts_root(receipts_root);
+			parent_hash = header.hash();
+			headers.push(header);
+		}
+
+		let mut downloader = BlockDownloader::new(BlockSet::OldBlocks, &headers[0].hash(), 0);
+		downloader.state = State::Blocks;
+		downloader.blocks.reset_to(vec![headers[0].hash()]);
+
+		// Only import the first three block headers.
+		let rlp_data = encode_list(&headers[0..3]);
+		let headers_rlp = Rlp::new(&rlp_data);
+		assert!(downloader.import_headers(&mut io, &headers_rlp, headers[0].hash()).is_ok());
+
+		// Import second and third receipts successfully.
+		let mut rlp_data = RlpStream::new_list(2);
+		rlp_data.append_raw(&receipts[1], 1);
+		rlp_data.append_raw(&receipts[2], 1);
+		let receipts_rlp = Rlp::new(rlp_data.as_raw());
+		assert!(downloader.import_receipts(&receipts_rlp, &[headers[1].hash(), headers[2].hash()]).is_ok());
+
+		// Import unexpected fourth receipt.
+		let mut rlp_data = RlpStream::new_list(1);
+		rlp_data.append_raw(&receipts[3], 1);
+		let bodies_rlp = Rlp::new(rlp_data.as_raw());
+		match downloader.import_bodies(&bodies_rlp, &[headers[1].hash(), headers[2].hash()]) {
+			Err(BlockDownloaderImportError::Invalid) => (),
+			_ => panic!("expected BlockDownloaderImportError"),
+		};
+	}
+
+	#[test]
+	fn reset_after_multiple_sets_of_useless_headers() {
+		::env_logger::try_init().ok();
+
+		let spec = Spec::new_test();
+		let genesis_hash = spec.genesis_header().hash();
+
+		let mut downloader = BlockDownloader::new(BlockSet::NewBlocks, &genesis_hash, 0);
+		downloader.state = State::ChainHead;
+
+		let mut chain = TestBlockChainClient::new();
+		let snapshot_service = TestSnapshotService::new();
+		let queue = RwLock::new(VecDeque::new());
+		let mut io = TestIo::new(&mut chain, &snapshot_service, &queue, None);
+
+		let heads = [
+			spec.genesis_header(),
+			dummy_header(127, H256::random()),
+			dummy_header(254, H256::random()),
+		];
+
+		let short_subchain = [dummy_header(1, genesis_hash)];
+
+		import_headers_ok(&heads, &mut downloader, &mut io);
+		import_headers_ok(&short_subchain, &mut downloader, &mut io);
+
+		assert_eq!(downloader.state, State::Blocks);
+		assert!(!downloader.blocks.is_empty());
+
+		// simulate receiving useless headers
+		let head = vec![short_subchain.last().unwrap().clone()];
+		for _ in 0..MAX_USELESS_HEADERS_PER_ROUND {
+			let res = import_headers(&head, &mut downloader, &mut io);
+			assert!(res.is_err());
+		}
+
+		assert_eq!(downloader.state, State::Idle);
+		assert!(downloader.blocks.is_empty());
+	}
+
+	#[test]
+	fn dont_reset_after_multiple_sets_of_useless_headers_for_chain_head() {
+		::env_logger::try_init().ok();
+
+		let spec = Spec::new_test();
+		let genesis_hash = spec.genesis_header().hash();
+
+		let mut downloader = BlockDownloader::new(BlockSet::NewBlocks, &genesis_hash, 0);
+		downloader.state = State::ChainHead;
+
+		let mut chain = TestBlockChainClient::new();
+		let snapshot_service = TestSnapshotService::new();
+		let queue = RwLock::new(VecDeque::new());
+		let mut io = TestIo::new(&mut chain, &snapshot_service, &queue, None);
+
+		let heads = [
+			spec.genesis_header()
+		];
+
+		let short_subchain = [dummy_header(1, genesis_hash)];
+
+		import_headers_ok(&heads, &mut downloader, &mut io);
+		import_headers_ok(&short_subchain, &mut downloader, &mut io);
+
+		assert_eq!(downloader.state, State::Blocks);
+		assert!(!downloader.blocks.is_empty());
+
+		// simulate receiving useless headers
+		let head = vec![short_subchain.last().unwrap().clone()];
+		for _ in 0..MAX_USELESS_HEADERS_PER_ROUND {
+			let res = import_headers(&head, &mut downloader, &mut io);
+			assert!(res.is_err());
+		}
+
+		// download shouldn't be reset since this is the chain head for a single subchain.
+		// this state usually occurs for NewBlocks when it has reached the chain head.
+		assert_eq!(downloader.state, State::Blocks);
+		assert!(!downloader.blocks.is_empty());
+	}
+}
diff --git a/ethcore/sync/src/blocks.rs b/ethcore/sync/src/blocks.rs
index 3815084f8f1..c64843e3b2a 100644
--- a/ethcore/sync/src/blocks.rs
+++ b/ethcore/sync/src/blocks.rs
@@ -215,32 +215,28 @@ impl BlockCollection {
 	}
 
 	/// Insert a collection of block bodies for previously downloaded headers.
-	pub fn insert_bodies(&mut self, bodies: Vec<SyncBody>) -> usize {
-		let mut inserted = 0;
-		for b in bodies {
-			if let Err(e) =  self.insert_body(b) {
-				trace!(target: "sync", "Ignored invalid body: {:?}", e);
-			} else {
-				inserted += 1;
-			}
-		}
-		inserted
+	pub fn insert_bodies(&mut self, bodies: Vec<SyncBody>) -> Vec<H256> {
+		bodies.into_iter()
+			.filter_map(|b| {
+				self.insert_body(b)
+					.map_err(|e| trace!(target: "sync", "Ignored invalid body: {:?}", e))
+					.ok()
+			})
+			.collect()
 	}
 
 	/// Insert a collection of block receipts for previously downloaded headers.
-	pub fn insert_receipts(&mut self, receipts: Vec<Bytes>) -> usize {
+	pub fn insert_receipts(&mut self, receipts: Vec<Bytes>) -> Vec<Vec<H256>> {
 		if !self.need_receipts {
-			return 0;
-		}
-		let mut inserted = 0;
-		for r in receipts {
-			if let Err(e) =  self.insert_receipt(r) {
-				trace!(target: "sync", "Ignored invalid receipt: {:?}", e);
-			} else {
-				inserted += 1;
-			}
+			return Vec::new();
 		}
-		inserted
+		receipts.into_iter()
+			.filter_map(|r| {
+				self.insert_receipt(r)
+					.map_err(|e| trace!(target: "sync", "Ignored invalid receipt: {:?}", e))
+					.ok()
+			})
+			.collect()
 	}
 
 	/// Returns a set of block hashes that require a body download. The returned set is marked as being downloaded.
@@ -401,9 +397,9 @@ impl BlockCollection {
 		self.blocks.contains_key(hash)
 	}
 
-	/// Check if collection contains a block header.
-	pub fn contains_head(&self, hash: &H256) -> bool {
-		self.heads.contains(hash)
+	/// Check the number of heads
+	pub fn heads_len(&self) -> usize {
+		self.heads.len()
 	}
 
 	/// Return used heap size.
@@ -421,7 +417,7 @@ impl BlockCollection {
 		self.downloading_headers.contains(hash) || self.downloading_bodies.contains(hash)
 	}
 
-	fn insert_body(&mut self, body: SyncBody) -> Result<(), network::Error> {
+	fn insert_body(&mut self, body: SyncBody) -> Result<H256, network::Error> {
 		let header_id = {
 			let tx_root = ordered_trie_root(Rlp::new(&body.transactions_bytes).iter().map(|r| r.as_raw()));
 			let uncles = keccak(&body.uncles_bytes);
@@ -438,7 +434,7 @@ impl BlockCollection {
 					Some(ref mut block) => {
 						trace!(target: "sync", "Got body {}", h);
 						block.body = Some(body);
-						Ok(())
+						Ok(h)
 					},
 					None => {
 						warn!("Got body with no header {}", h);
@@ -453,7 +449,7 @@ impl BlockCollection {
 		}
 	}
 
-	fn insert_receipt(&mut self, r: Bytes) -> Result<(), network::Error> {
+	fn insert_receipt(&mut self, r: Bytes) -> Result<Vec<H256>, network::Error> {
 		let receipt_root = {
 			let receipts = Rlp::new(&r);
 			ordered_trie_root(receipts.iter().map(|r| r.as_raw()))
@@ -461,7 +457,8 @@ impl BlockCollection {
 		self.downloading_receipts.remove(&receipt_root);
 		match self.receipt_ids.entry(receipt_root) {
 			hash_map::Entry::Occupied(entry) => {
-				for h in entry.remove() {
+				let block_hashes = entry.remove();
+				for h in block_hashes.iter() {
 					match self.blocks.get_mut(&h) {
 						Some(ref mut block) => {
 							trace!(target: "sync", "Got receipt {}", h);
@@ -473,7 +470,7 @@ impl BlockCollection {
 						}
 					}
 				}
-				Ok(())
+				Ok(block_hashes.to_vec())
 			},
 			hash_map::Entry::Vacant(_) => {
 				trace!(target: "sync", "Ignored unknown/stale block receipt {:?}", receipt_root);
diff --git a/ethcore/sync/src/chain/handler.rs b/ethcore/sync/src/chain/handler.rs
index 15f234fbbfe..bbb3db3288e 100644
--- a/ethcore/sync/src/chain/handler.rs
+++ b/ethcore/sync/src/chain/handler.rs
@@ -28,6 +28,7 @@ use network::PeerId;
 use rlp::Rlp;
 use snapshot::ChunkType;
 use std::cmp;
+use std::mem;
 use std::collections::HashSet;
 use std::time::Instant;
 use sync_io::SyncIo;
@@ -292,10 +293,19 @@ impl SyncHandler {
 		let block_set = sync.peers.get(&peer_id)
 			.and_then(|p| p.block_set)
 			.unwrap_or(BlockSet::NewBlocks);
-		if !sync.reset_peer_asking(peer_id, PeerAsking::BlockBodies) {
+		let allowed = sync.peers.get(&peer_id).map(|p| p.is_allowed()).unwrap_or(false);
+
+		if !sync.reset_peer_asking(peer_id, PeerAsking::BlockBodies) || !allowed {
 			trace!(target: "sync", "{}: Ignored unexpected bodies", peer_id);
 			return Ok(());
 		}
+		let expected_blocks = match sync.peers.get_mut(&peer_id) {
+			Some(peer) => mem::replace(&mut peer.asking_blocks, Vec::new()),
+			None => {
+				trace!(target: "sync", "{}: Ignored unexpected bodies (peer not found)", peer_id);
+				return Ok(());
+			}
+		};
 		let item_count = r.item_count()?;
 		trace!(target: "sync", "{} -> BlockBodies ({} entries), set = {:?}", peer_id, item_count, block_set);
 		if item_count == 0 {
@@ -315,7 +325,7 @@ impl SyncHandler {
 						Some(ref mut blocks) => blocks,
 					}
 				};
-				downloader.import_bodies(r)?;
+				downloader.import_bodies(r, expected_blocks.as_slice())?;
 			}
 			sync.collect_blocks(io, block_set);
 			Ok(())
@@ -368,10 +378,23 @@ impl SyncHandler {
 		let expected_hash = sync.peers.get(&peer_id).and_then(|p| p.asking_hash);
 		let allowed = sync.peers.get(&peer_id).map(|p| p.is_allowed()).unwrap_or(false);
 		let block_set = sync.peers.get(&peer_id).and_then(|p| p.block_set).unwrap_or(BlockSet::NewBlocks);
-		if !sync.reset_peer_asking(peer_id, PeerAsking::BlockHeaders) || expected_hash.is_none() || !allowed {
-			trace!(target: "sync", "{}: Ignored unexpected headers, expected_hash = {:?}", peer_id, expected_hash);
+
+		if !sync.reset_peer_asking(peer_id, PeerAsking::BlockHeaders) {
+			debug!(target: "sync", "{}: Ignored unexpected headers", peer_id);
 			return Ok(());
 		}
+		let expected_hash = match expected_hash {
+			Some(hash) => hash,
+			None => {
+				debug!(target: "sync", "{}: Ignored unexpected headers (expected_hash is None)", peer_id);
+				return Ok(());
+			}
+		};
+		if !allowed {
+			debug!(target: "sync", "{}: Ignored unexpected headers (peer not allowed)", peer_id);
+			return Ok(());
+		}
+
 		let item_count = r.item_count()?;
 		trace!(target: "sync", "{} -> BlockHeaders ({} entries), state = {:?}, set = {:?}", peer_id, item_count, sync.state, block_set);
 		if (sync.state == SyncState::Idle || sync.state == SyncState::WaitingPeers) && sync.old_blocks.is_none() {
@@ -399,12 +422,8 @@ impl SyncHandler {
 			downloader.import_headers(io, r, expected_hash)?
 		};
 
-		if let DownloadAction::Reset = result {
-			// mark all outstanding requests as expired
-			trace!("Resetting downloads for {:?}", block_set);
-			for (_, ref mut p) in sync.peers.iter_mut().filter(|&(_, ref p)| p.block_set == Some(block_set)) {
-				p.reset_asking();
-			}
+		if result == DownloadAction::Reset {
+			sync.reset_downloads(block_set);
 		}
 
 		sync.collect_blocks(io, block_set);
@@ -415,10 +434,18 @@ impl SyncHandler {
 	fn on_peer_block_receipts(sync: &mut ChainSync, io: &mut SyncIo, peer_id: PeerId, r: &Rlp) -> Result<(), DownloaderImportError> {
 		sync.clear_peer_download(peer_id);
 		let block_set = sync.peers.get(&peer_id).and_then(|p| p.block_set).unwrap_or(BlockSet::NewBlocks);
-		if !sync.reset_peer_asking(peer_id, PeerAsking::BlockReceipts) {
+		let allowed = sync.peers.get(&peer_id).map(|p| p.is_allowed()).unwrap_or(false);
+		if !sync.reset_peer_asking(peer_id, PeerAsking::BlockReceipts) || !allowed {
 			trace!(target: "sync", "{}: Ignored unexpected receipts", peer_id);
 			return Ok(());
 		}
+		let expected_blocks = match sync.peers.get_mut(&peer_id) {
+			Some(peer) => mem::replace(&mut peer.asking_blocks, Vec::new()),
+			None => {
+				trace!(target: "sync", "{}: Ignored unexpected bodies (peer not found)", peer_id);
+				return Ok(());
+			}
+		};
 		let item_count = r.item_count()?;
 		trace!(target: "sync", "{} -> BlockReceipts ({} entries)", peer_id, item_count);
 		if item_count == 0 {
@@ -438,7 +465,7 @@ impl SyncHandler {
 						Some(ref mut blocks) => blocks,
 					}
 				};
-				downloader.import_receipts(io, r)?;
+				downloader.import_receipts(r, expected_blocks.as_slice())?;
 			}
 			sync.collect_blocks(io, block_set);
 			Ok(())
diff --git a/ethcore/sync/src/chain/mod.rs b/ethcore/sync/src/chain/mod.rs
index 06bd3febab6..f5a0e30b8da 100644
--- a/ethcore/sync/src/chain/mod.rs
+++ b/ethcore/sync/src/chain/mod.rs
@@ -109,7 +109,7 @@ use ethcore::client::{BlockChainClient, BlockStatus, BlockId, BlockChainInfo, Bl
 use ethcore::snapshot::{RestorationStatus};
 use sync_io::SyncIo;
 use super::{WarpSync, SyncConfig};
-use block_sync::{BlockDownloader, BlockDownloaderImportError as DownloaderImportError};
+use block_sync::{BlockDownloader, DownloadAction};
 use rand::Rng;
 use snapshot::{Snapshot};
 use api::{EthProtocolInfo as PeerInfoDigest, WARP_SYNC_PROTOCOL_ID};
@@ -429,7 +429,7 @@ impl ChainSync {
 			peers: HashMap::new(),
 			handshaking_peers: HashMap::new(),
 			active_peers: HashSet::new(),
-			new_blocks: BlockDownloader::new(false, &chain_info.best_block_hash, chain_info.best_block_number),
+			new_blocks: BlockDownloader::new(BlockSet::NewBlocks, &chain_info.best_block_hash, chain_info.best_block_number),
 			old_blocks: None,
 			last_sent_block_number: 0,
 			network_id: config.network_id,
@@ -507,8 +507,9 @@ impl ChainSync {
 		self.peers.clear();
 	}
 
-	/// Reset sync. Clear all downloaded data but keep the queue
-	fn reset(&mut self, io: &mut SyncIo) {
+	/// Reset sync. Clear all downloaded data but keep the queue.
+	/// Set sync state to the given state or to the initial state if `None` is provided.
+	fn reset(&mut self, io: &mut SyncIo, state: Option<SyncState>) {
 		self.new_blocks.reset();
 		let chain_info = io.chain().chain_info();
 		for (_, ref mut p) in &mut self.peers {
@@ -520,7 +521,7 @@ impl ChainSync {
 				}
 			}
 		}
-		self.state = ChainSync::get_init_state(self.warp_sync, io.chain());
+		self.state = state.unwrap_or_else(|| ChainSync::get_init_state(self.warp_sync, io.chain()));
 		// Reactivate peers only if some progress has been made
 		// since the last sync round of if starting fresh.
 		self.active_peers = self.peers.keys().cloned().collect();
@@ -534,7 +535,7 @@ impl ChainSync {
 			io.snapshot_service().abort_restore();
 		}
 		self.snapshot.clear();
-		self.reset(io);
+		self.reset(io, None);
 		self.continue_sync(io);
 	}
 
@@ -637,13 +638,13 @@ impl ChainSync {
 	pub fn update_targets(&mut self, chain: &BlockChainClient) {
 		// Do not assume that the block queue/chain still has our last_imported_block
 		let chain = chain.chain_info();
-		self.new_blocks = BlockDownloader::new(false, &chain.best_block_hash, chain.best_block_number);
+		self.new_blocks = BlockDownloader::new(BlockSet::NewBlocks, &chain.best_block_hash, chain.best_block_number);
 		self.old_blocks = None;
 		if self.download_old_blocks {
 			if let (Some(ancient_block_hash), Some(ancient_block_number)) = (chain.ancient_block_hash, chain.ancient_block_number) {
 
 				trace!(target: "sync", "Downloading old blocks from {:?} (#{}) till {:?} (#{:?})", ancient_block_hash, ancient_block_number, chain.first_block_hash, chain.first_block_number);
-				let mut downloader = BlockDownloader::with_unlimited_reorg(true, &ancient_block_hash, ancient_block_number);
+				let mut downloader = BlockDownloader::new(BlockSet::OldBlocks, &ancient_block_hash, ancient_block_number);
 				if let Some(hash) = chain.first_block_hash {
 					trace!(target: "sync", "Downloader target set to {:?}", hash);
 					downloader.set_target(&hash);
@@ -699,7 +700,7 @@ impl ChainSync {
 	/// Called after all blocks have been downloaded
 	fn complete_sync(&mut self, io: &mut SyncIo) {
 		trace!(target: "sync", "Sync complete");
-		self.reset(io);
+		self.reset(io, Some(SyncState::Idle));
 	}
 
 	/// Enter waiting state
@@ -762,12 +763,10 @@ impl ChainSync {
 						}
 					}
 
-					// Only ask for old blocks if the peer has a higher difficulty than the last imported old block
-					let last_imported_old_block_difficulty = self.old_blocks.as_mut().and_then(|d| {
-						io.chain().block_total_difficulty(BlockId::Number(d.last_imported_block_number()))
-					});
+					// Only ask for old blocks if the peer has an equal or higher difficulty
+					let equal_or_higher_difficulty = peer_difficulty.map_or(false, |pd| pd >= syncing_difficulty);
 
-					if force || last_imported_old_block_difficulty.map_or(true, |ld| peer_difficulty.map_or(true, |pd| pd > ld)) {
+					if force || equal_or_higher_difficulty {
 						if let Some(request) = self.old_blocks.as_mut().and_then(|d| d.request_blocks(io, num_active_peers)) {
 							SyncRequester::request_blocks(self, io, peer_id, request, BlockSet::OldBlocks);
 							return;
@@ -775,9 +774,9 @@ impl ChainSync {
 					} else {
 						trace!(
 							target: "sync",
-							"peer {:?} is not suitable for requesting old blocks, last_imported_old_block_difficulty={:?}, peer_difficulty={:?}",
+							"peer {:?} is not suitable for requesting old blocks, syncing_difficulty={:?}, peer_difficulty={:?}",
 							peer_id,
-							last_imported_old_block_difficulty,
+							syncing_difficulty,
 							peer_difficulty
 						);
 						self.deactivate_peer(io, peer_id);
@@ -855,18 +854,39 @@ impl ChainSync {
 	fn collect_blocks(&mut self, io: &mut SyncIo, block_set: BlockSet) {
 		match block_set {
 			BlockSet::NewBlocks => {
-				if self.new_blocks.collect_blocks(io, self.state == SyncState::NewBlocks) == Err(DownloaderImportError::Invalid) {
-					self.restart(io);
+				if self.new_blocks.collect_blocks(io, self.state == SyncState::NewBlocks) == DownloadAction::Reset {
+					self.reset_downloads(block_set);
+					self.new_blocks.reset();
 				}
 			},
 			BlockSet::OldBlocks => {
-				if self.old_blocks.as_mut().map_or(false, |downloader| { downloader.collect_blocks(io, false) == Err(DownloaderImportError::Invalid) }) {
-					self.restart(io);
-				} else if self.old_blocks.as_ref().map_or(false, |downloader| { downloader.is_complete() }) {
+				let mut is_complete = false;
+				let mut download_action = DownloadAction::None;
+				if let Some(downloader) = self.old_blocks.as_mut() {
+					download_action = downloader.collect_blocks(io, false);
+					is_complete = downloader.is_complete();
+				}
+
+				if download_action == DownloadAction::Reset {
+					self.reset_downloads(block_set);
+					if let Some(downloader) = self.old_blocks.as_mut() {
+						downloader.reset();
+					}
+				}
+
+				if is_complete {
 					trace!(target: "sync", "Background block download is complete");
 					self.old_blocks = None;
 				}
 			}
+		};
+	}
+
+	/// Mark all outstanding requests as expired
+	fn reset_downloads(&mut self, block_set: BlockSet) {
+		trace!(target: "sync", "Resetting downloads for {:?}", block_set);
+		for (_, ref mut p) in self.peers.iter_mut().filter(|&(_, ref p)| p.block_set == Some(block_set)) {
+			p.reset_asking();
 		}
 	}
 
diff --git a/ethcore/sync/src/chain/propagator.rs b/ethcore/sync/src/chain/propagator.rs
index 102a3171246..82b592c4ba0 100644
--- a/ethcore/sync/src/chain/propagator.rs
+++ b/ethcore/sync/src/chain/propagator.rs
@@ -200,7 +200,7 @@ impl SyncPropagator {
 								let appended = packet.append_raw_checked(&transaction.drain(), 1, MAX_TRANSACTION_PACKET_SIZE);
 								if !appended {
 									// Maximal packet size reached just proceed with sending
-									debug!("Transaction packet size limit reached. Sending incomplete set of {}/{} transactions.", pushed, to_send.len());
+									debug!(target: "sync", "Transaction packet size limit reached. Sending incomplete set of {}/{} transactions.", pushed, to_send.len());
 									to_send = to_send.into_iter().take(pushed).collect();
 									break;
 								}
diff --git a/ethcore/sync/src/tests/chain.rs b/ethcore/sync/src/tests/chain.rs
index 0b6c8f7c284..06118df66b5 100644
--- a/ethcore/sync/src/tests/chain.rs
+++ b/ethcore/sync/src/tests/chain.rs
@@ -225,32 +225,28 @@ fn propagate_blocks() {
 
 #[test]
 fn restart_on_malformed_block() {
+	::env_logger::try_init().ok();
 	let mut net = TestNet::new(2);
-	net.peer(1).chain.add_blocks(10, EachBlockWith::Uncle);
-	net.peer(1).chain.corrupt_block(6);
-	net.sync_steps(20);
-
-	assert_eq!(net.peer(0).chain.chain_info().best_block_number, 5);
-}
-
-#[test]
-fn restart_on_broken_chain() {
-	let mut net = TestNet::new(2);
-	net.peer(1).chain.add_blocks(10, EachBlockWith::Uncle);
-	net.peer(1).chain.corrupt_block_parent(6);
+	net.peer(1).chain.add_blocks(5, EachBlockWith::Nothing);
+	net.peer(1).chain.add_block(EachBlockWith::Nothing, |mut header| {
+		header.set_extra_data(b"This extra data is way too long to be considered valid".to_vec());
+		header
+	});
 	net.sync_steps(20);
 
-	assert_eq!(net.peer(0).chain.chain_info().best_block_number, 5);
+	// This gets accepted just fine since the TestBlockChainClient performs no validation.
+	// Probably remove this test?
+	assert_eq!(net.peer(0).chain.chain_info().best_block_number, 6);
 }
 
 #[test]
-fn high_td_attach() {
+fn reject_on_broken_chain() {
 	let mut net = TestNet::new(2);
-	net.peer(1).chain.add_blocks(10, EachBlockWith::Uncle);
+	net.peer(1).chain.add_blocks(10, EachBlockWith::Nothing);
 	net.peer(1).chain.corrupt_block_parent(6);
 	net.sync_steps(20);
 
-	assert_eq!(net.peer(0).chain.chain_info().best_block_number, 5);
+	assert_eq!(net.peer(0).chain.chain_info().best_block_number, 0);
 }
 
 #[test]
diff --git a/ethcore/transaction/src/transaction.rs b/ethcore/transaction/src/transaction.rs
index f5034c4b2ae..ee37f68524d 100644
--- a/ethcore/transaction/src/transaction.rs
+++ b/ethcore/transaction/src/transaction.rs
@@ -90,8 +90,8 @@ pub mod signature {
 		match v {
 			v if v == 27 => 0,
 			v if v == 28 => 1,
-			v if v > 36 => ((v - 1) % 2) as u8,
-			 _ => 4
+			v if v >= 35 => ((v - 1) % 2) as u8,
+			_ => 4
 		}
 	}
 }
@@ -364,7 +364,7 @@ impl UnverifiedTransaction {
 	pub fn chain_id(&self) -> Option<u64> {
 		match self.v {
 			v if self.is_unsigned() => Some(v),
-			v if v > 36 => Some((v - 35) / 2),
+			v if v >= 35 => Some((v - 35) / 2),
 			_ => None,
 		}
 	}
@@ -583,6 +583,27 @@ mod tests {
 		assert_eq!(t.chain_id(), None);
 	}
 
+	#[test]
+	fn signing_eip155_zero_chainid() {
+		use ethkey::{Random, Generator};
+
+		let key = Random.generate().unwrap();
+		let t = Transaction {
+			action: Action::Create,
+			nonce: U256::from(42),
+			gas_price: U256::from(3000),
+			gas: U256::from(50_000),
+			value: U256::from(1),
+			data: b"Hello!".to_vec()
+		};
+
+		let hash = t.hash(Some(0));
+		let sig = ::ethkey::sign(&key.secret(), &hash).unwrap();
+		let u = t.with_signature(sig, Some(0));
+
+		assert!(SignedTransaction::new(u).is_ok());
+	}
+
 	#[test]
 	fn signing() {
 		use ethkey::{Random, Generator};
diff --git a/ethcore/vm/Cargo.toml b/ethcore/vm/Cargo.toml
index d199ed552b9..4ea807089e4 100644
--- a/ethcore/vm/Cargo.toml
+++ b/ethcore/vm/Cargo.toml
@@ -7,7 +7,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 byteorder = "1.0"
 parity-bytes = "0.1"
 ethereum-types = "0.4"
-patricia-trie = "0.2.1"
+patricia-trie = "0.2"
 patricia-trie-ethereum = { path = "../../util/patricia-trie-ethereum" }
 log = "0.4"
 common-types = { path = "../types" }
diff --git a/ethcore/vm/src/ext.rs b/ethcore/vm/src/ext.rs
index 168640593b8..2994fba5c2a 100644
--- a/ethcore/vm/src/ext.rs
+++ b/ethcore/vm/src/ext.rs
@@ -140,10 +140,10 @@ pub trait Ext {
 	fn depth(&self) -> usize;
 
 	/// Increments sstore refunds counter.
-	fn add_sstore_refund(&mut self, value: U256);
+	fn add_sstore_refund(&mut self, value: usize);
 
 	/// Decrements sstore refunds counter.
-	fn sub_sstore_refund(&mut self, value: U256);
+	fn sub_sstore_refund(&mut self, value: usize);
 
 	/// Decide if any more operations should be traced. Passthrough for the VM trace.
 	fn trace_next_instruction(&mut self, _pc: usize, _instruction: u8, _current_gas: U256) -> bool { false }
diff --git a/ethcore/vm/src/tests.rs b/ethcore/vm/src/tests.rs
index b6e44f000e4..fef1da29574 100644
--- a/ethcore/vm/src/tests.rs
+++ b/ethcore/vm/src/tests.rs
@@ -56,7 +56,7 @@ pub struct FakeExt {
 	pub store: HashMap<H256, H256>,
 	pub suicides: HashSet<Address>,
 	pub calls: HashSet<FakeCall>,
-	pub sstore_clears: U256,
+	pub sstore_clears: i128,
 	pub depth: usize,
 	pub blockhashes: HashMap<U256, H256>,
 	pub codes: HashMap<Address, Arc<Bytes>>,
@@ -220,12 +220,12 @@ impl Ext for FakeExt {
 		self.is_static
 	}
 
-	fn add_sstore_refund(&mut self, value: U256) {
-		self.sstore_clears = self.sstore_clears + value;
+	fn add_sstore_refund(&mut self, value: usize) {
+		self.sstore_clears += value as i128;
 	}
 
-	fn sub_sstore_refund(&mut self, value: U256) {
-		self.sstore_clears = self.sstore_clears - value;
+	fn sub_sstore_refund(&mut self, value: usize) {
+		self.sstore_clears -= value as i128;
 	}
 
 	fn trace_next_instruction(&mut self, _pc: usize, _instruction: u8, _gas: U256) -> bool {
diff --git a/ethcore/wasm/src/runtime.rs b/ethcore/wasm/src/runtime.rs
index 41c0d950da4..9d10eb5404d 100644
--- a/ethcore/wasm/src/runtime.rs
+++ b/ethcore/wasm/src/runtime.rs
@@ -285,7 +285,7 @@ impl<'a> Runtime<'a> {
 		self.ext.set_storage(key, val).map_err(|_| Error::StorageUpdateError)?;
 
 		if former_val != H256::zero() && val == H256::zero() {
-			let sstore_clears_schedule = U256::from(self.schedule().sstore_refund_gas);
+			let sstore_clears_schedule = self.schedule().sstore_refund_gas;
 			self.ext.add_sstore_refund(sstore_clears_schedule);
 		}
 
diff --git a/json/src/spec/engine.rs b/json/src/spec/engine.rs
index f8476757c3f..020cc1fd0ba 100644
--- a/json/src/spec/engine.rs
+++ b/json/src/spec/engine.rs
@@ -26,7 +26,7 @@ pub enum Engine {
 	Null(NullEngine),
 	/// Instantly sealing engine.
 	#[serde(rename="instantSeal")]
-	InstantSeal(InstantSeal),
+	InstantSeal(Option<InstantSeal>),
 	/// Ethash engine.
 	Ethash(Ethash),
 	/// BasicAuthority engine.
@@ -71,6 +71,17 @@ mod tests {
 			_ => panic!(),
 		};
 
+		let s = r#"{
+			"instantSeal": null
+		}"#;
+
+		let deserialized: Engine = serde_json::from_str(s).unwrap();
+		match deserialized {
+			Engine::InstantSeal(_) => {},	// instant seal is unit tested in its own file.
+			_ => panic!(),
+		};
+
+
 		let s = r#"{
 			"Ethash": {
 				"params": {
diff --git a/parity/cli/mod.rs b/parity/cli/mod.rs
index 899b3932d82..a65a4b79945 100644
--- a/parity/cli/mod.rs
+++ b/parity/cli/mod.rs
@@ -704,11 +704,11 @@ usage! {
 			"--price-update-period=[T]",
 			"T will be allowed to pass between each gas price update. T may be daily, hourly, a number of seconds, or a time string of the form \"2 days\", \"30 minutes\" etc..",
 
-			ARG arg_gas_floor_target: (String) = "4700000", or |c: &Config| c.mining.as_ref()?.gas_floor_target.clone(),
+			ARG arg_gas_floor_target: (String) = "8000000", or |c: &Config| c.mining.as_ref()?.gas_floor_target.clone(),
 			"--gas-floor-target=[GAS]",
 			"Amount of gas per block to target when sealing a new block.",
 
-			ARG arg_gas_cap: (String) = "6283184", or |c: &Config| c.mining.as_ref()?.gas_cap.clone(),
+			ARG arg_gas_cap: (String) = "10000000", or |c: &Config| c.mining.as_ref()?.gas_cap.clone(),
 			"--gas-cap=[GAS]",
 			"A cap on how large we will raise the gas limit per block due to transaction volume.",
 
@@ -865,6 +865,10 @@ usage! {
 			"--no-periodic-snapshot",
 			"Disable automated snapshots which usually occur once every 10000 blocks.",
 
+			ARG arg_snapshot_threads: (Option<usize>) = None, or |c: &Config| c.snapshots.as_ref()?.processing_threads,
+			"--snapshot-threads=[NUM]",
+			"Enables multiple threads for snapshots creation.",
+
 		["Whisper Options"]
 			FLAG flag_whisper: (bool) = false, or |c: &Config| c.whisper.as_ref()?.enabled,
 			"--whisper",
@@ -1345,6 +1349,7 @@ struct Footprint {
 #[serde(deny_unknown_fields)]
 struct Snapshots {
 	disable_periodic: Option<bool>,
+	processing_threads: Option<usize>,
 }
 
 #[derive(Default, Debug, PartialEq, Deserialize)]
@@ -1712,7 +1717,7 @@ mod tests {
 			arg_reseal_max_period: 60000u64,
 			flag_reseal_on_uncle: false,
 			arg_work_queue_size: 20usize,
-			arg_tx_gas_limit: Some("6283184".into()),
+			arg_tx_gas_limit: Some("10000000".into()),
 			arg_tx_time_limit: Some(100u64),
 			arg_relay_set: "cheap".into(),
 			arg_min_gas_price: Some(0u64),
@@ -1721,8 +1726,8 @@ mod tests {
 			arg_poll_lifetime: 60u32,
 			arg_usd_per_eth: "auto".into(),
 			arg_price_update_period: "hourly".into(),
-			arg_gas_floor_target: "4700000".into(),
-			arg_gas_cap: "6283184".into(),
+			arg_gas_floor_target: "8000000".into(),
+			arg_gas_cap: "10000000".into(),
 			arg_extra_data: Some("Parity".into()),
 			flag_tx_queue_no_unfamiliar_locals: false,
 			flag_tx_queue_no_early_reject: false,
@@ -1771,6 +1776,7 @@ mod tests {
 			arg_export_state_at: "latest".into(),
 			arg_snapshot_at: "latest".into(),
 			flag_no_periodic_snapshot: false,
+			arg_snapshot_threads: None,
 
 			// -- Whisper options.
 			flag_whisper: false,
@@ -2021,6 +2027,7 @@ mod tests {
 			}),
 			snapshots: Some(Snapshots {
 				disable_periodic: Some(true),
+				processing_threads: None,
 			}),
 			misc: Some(Misc {
 				logging: Some("own_tx=trace".into()),
diff --git a/parity/cli/tests/config.full.toml b/parity/cli/tests/config.full.toml
index d615996cfce..2c9fe271db4 100644
--- a/parity/cli/tests/config.full.toml
+++ b/parity/cli/tests/config.full.toml
@@ -125,13 +125,13 @@ min_gas_price = 0
 usd_per_tx = "0.0001"
 usd_per_eth = "auto"
 price_update_period = "hourly"
-gas_floor_target = "4700000"
-gas_cap = "6283184"
+gas_floor_target = "8000000"
+gas_cap = "10000000"
 tx_queue_size = 8192
 tx_queue_strategy = "gas_factor"
 tx_queue_ban_count = 1
 tx_queue_ban_time = 180 #s
-tx_gas_limit = "6283184"
+tx_gas_limit = "10000000"
 tx_time_limit = 100 #ms
 tx_queue_no_unfamiliar_locals = false
 tx_queue_no_early_reject = false
diff --git a/parity/configuration.rs b/parity/configuration.rs
index 6a40aff3d60..6f99aa80bc2 100644
--- a/parity/configuration.rs
+++ b/parity/configuration.rs
@@ -30,8 +30,10 @@ use sync::{NetworkConfiguration, validate_node_url, self};
 use ethcore::ethstore::ethkey::{Secret, Public};
 use ethcore::client::{VMType};
 use ethcore::miner::{stratum, MinerOptions};
+use ethcore::snapshot::SnapshotConfiguration;
 use ethcore::verification::queue::VerifierSettings;
 use miner::pool;
+use num_cpus;
 
 use rpc::{IpcConfiguration, HttpConfiguration, WsConfiguration};
 use parity_rpc::NetworkSettings;
@@ -125,6 +127,7 @@ impl Configuration {
 		let update_policy = self.update_policy()?;
 		let logger_config = self.logger_config();
 		let ws_conf = self.ws_config()?;
+		let snapshot_conf = self.snapshot_config()?;
 		let http_conf = self.http_config()?;
 		let ipc_conf = self.ipc_config()?;
 		let net_conf = self.net_config()?;
@@ -298,6 +301,7 @@ impl Configuration {
 				file_path: self.args.arg_snapshot_file.clone(),
 				kind: snapshot::Kind::Take,
 				block_at: to_block_id(&self.args.arg_snapshot_at)?,
+				snapshot_conf: snapshot_conf,
 			};
 			Cmd::Snapshot(snapshot_cmd)
 		} else if self.args.cmd_restore {
@@ -314,6 +318,7 @@ impl Configuration {
 				file_path: self.args.arg_restore_file.clone(),
 				kind: snapshot::Kind::Restore,
 				block_at: to_block_id("latest")?, // unimportant.
+				snapshot_conf: snapshot_conf,
 			};
 			Cmd::Snapshot(restore_cmd)
 		} else if self.args.cmd_export_hardcoded_sync {
@@ -349,6 +354,7 @@ impl Configuration {
 				gas_price_percentile: self.args.arg_gas_price_percentile,
 				poll_lifetime: self.args.arg_poll_lifetime,
 				ws_conf: ws_conf,
+				snapshot_conf: snapshot_conf,
 				http_conf: http_conf,
 				ipc_conf: ipc_conf,
 				net_conf: net_conf,
@@ -374,7 +380,6 @@ impl Configuration {
 				private_tx_enabled,
 				name: self.args.arg_identity,
 				custom_bootnodes: self.args.arg_bootnodes.is_some(),
-				no_periodic_snapshot: self.args.flag_no_periodic_snapshot,
 				check_seal: !self.args.flag_no_seal_check,
 				download_old_blocks: !self.args.flag_no_ancient_blocks,
 				verifier_settings: verifier_settings,
@@ -890,6 +895,18 @@ impl Configuration {
 		Ok((provider_conf, encryptor_conf, self.args.flag_private_enabled))
 	}
 
+	fn snapshot_config(&self) -> Result<SnapshotConfiguration, String> {
+		let conf = SnapshotConfiguration {
+			no_periodic: self.args.flag_no_periodic_snapshot,
+			processing_threads: match self.args.arg_snapshot_threads {
+				Some(threads) if threads > 0 => threads,
+				_ => ::std::cmp::max(1, num_cpus::get() / 2),
+			},
+		};
+
+		Ok(conf)
+	}
+
 	fn network_settings(&self) -> Result<NetworkSettings, String> {
 		let http_conf = self.http_config()?;
 		let net_addresses = self.net_addresses()?;
@@ -1398,7 +1415,7 @@ mod tests {
 			name: "".into(),
 			custom_bootnodes: false,
 			fat_db: Default::default(),
-			no_periodic_snapshot: false,
+			snapshot_conf: Default::default(),
 			stratum: None,
 			check_seal: true,
 			download_old_blocks: true,
diff --git a/parity/params.rs b/parity/params.rs
index df924aee39e..52a2c3a049e 100644
--- a/parity/params.rs
+++ b/parity/params.rs
@@ -286,7 +286,7 @@ impl Default for MinerExtras {
 			author: Default::default(),
 			engine_signer: Default::default(),
 			extra_data: version_data(),
-			gas_range_target: (4_700_000.into(), 6_283_184.into()),
+			gas_range_target: (8_000_000.into(), 10_000_000.into()),
 			work_notify: Default::default(),
 		}
 	}
diff --git a/parity/run.rs b/parity/run.rs
index 73324aa0896..5d7075ed2d8 100644
--- a/parity/run.rs
+++ b/parity/run.rs
@@ -25,7 +25,7 @@ use ethcore::account_provider::{AccountProvider, AccountProviderSettings};
 use ethcore::client::{BlockId, CallContract, Client, Mode, DatabaseCompactionProfile, VMType, BlockChainClient, BlockInfo};
 use ethcore::ethstore::ethkey;
 use ethcore::miner::{stratum, Miner, MinerService, MinerOptions};
-use ethcore::snapshot;
+use ethcore::snapshot::{self, SnapshotConfiguration};
 use ethcore::spec::{SpecParams, OptimizeFor};
 use ethcore::verification::queue::VerifierSettings;
 use ethcore_logger::{Config as LogConfig, RotatingLogger};
@@ -119,7 +119,7 @@ pub struct RunCmd {
 	pub name: String,
 	pub custom_bootnodes: bool,
 	pub stratum: Option<stratum::Options>,
-	pub no_periodic_snapshot: bool,
+	pub snapshot_conf: SnapshotConfiguration,
 	pub check_seal: bool,
 	pub download_old_blocks: bool,
 	pub verifier_settings: VerifierSettings,
@@ -531,6 +531,7 @@ fn execute_impl<Cr, Rr>(cmd: RunCmd, logger: Arc<RotatingLogger>, on_client_rq:
 
 	client_config.queue.verifier_settings = cmd.verifier_settings;
 	client_config.transaction_verification_queue_size = ::std::cmp::max(2048, txpool_size / 4);
+	client_config.snapshot = cmd.snapshot_conf.clone();
 
 	// set up bootnodes
 	let mut net_conf = cmd.net_conf;
@@ -778,7 +779,7 @@ fn execute_impl<Cr, Rr>(cmd: RunCmd, logger: Arc<RotatingLogger>, on_client_rq:
 	});
 
 	// the watcher must be kept alive.
-	let watcher = match cmd.no_periodic_snapshot {
+	let watcher = match cmd.snapshot_conf.no_periodic {
 		true => None,
 		false => {
 			let sync = sync_provider.clone();
@@ -960,6 +961,11 @@ fn prepare_account_provider(spec: &SpecType, dirs: &Directories, data_dir: &str,
 		account_settings,
 	);
 
+	// Add development account if running dev chain:
+	if let SpecType::Dev = *spec {
+		insert_dev_account(&account_provider);
+	}
+
 	for a in cfg.unlocked_accounts {
 		// Check if the account exists
 		if !account_provider.has_account(a) {
@@ -976,11 +982,6 @@ fn prepare_account_provider(spec: &SpecType, dirs: &Directories, data_dir: &str,
 		}
 	}
 
-	// Add development account if running dev chain:
-	if let SpecType::Dev = *spec {
-		insert_dev_account(&account_provider);
-	}
-
 	Ok(account_provider)
 }
 
diff --git a/parity/snapshot.rs b/parity/snapshot.rs
index 0611734fd33..bc087e704a8 100644
--- a/parity/snapshot.rs
+++ b/parity/snapshot.rs
@@ -22,7 +22,7 @@ use std::sync::Arc;
 
 use hash::keccak;
 use ethcore::account_provider::AccountProvider;
-use ethcore::snapshot::{Progress, RestorationStatus, SnapshotService as SS};
+use ethcore::snapshot::{Progress, RestorationStatus, SnapshotConfiguration, SnapshotService as SS};
 use ethcore::snapshot::io::{SnapshotReader, PackedReader, PackedWriter};
 use ethcore::snapshot::service::Service as SnapshotService;
 use ethcore::client::{Mode, DatabaseCompactionProfile, VMType};
@@ -62,6 +62,7 @@ pub struct SnapshotCommand {
 	pub file_path: Option<String>,
 	pub kind: Kind,
 	pub block_at: BlockId,
+	pub snapshot_conf: SnapshotConfiguration,
 }
 
 // helper for reading chunks from arbitrary reader and feeding them into the
@@ -165,7 +166,7 @@ impl SnapshotCommand {
 		execute_upgrades(&self.dirs.base, &db_dirs, algorithm, &self.compaction)?;
 
 		// prepare client config
-		let client_config = to_client_config(
+		let mut client_config = to_client_config(
 			&self.cache_config,
 			spec.name.to_lowercase(),
 			Mode::Active,
@@ -180,6 +181,8 @@ impl SnapshotCommand {
 			true,
 		);
 
+		client_config.snapshot = self.snapshot_conf;
+
 		let restoration_db_handler = db::restoration_db_handler(&client_path, &client_config);
 		let client_db = restoration_db_handler.open(&client_path)
 			.map_err(|e| format!("Failed to open database {:?}", e))?;
diff --git a/rpc/Cargo.toml b/rpc/Cargo.toml
index 09b7c860398..84568391f38 100644
--- a/rpc/Cargo.toml
+++ b/rpc/Cargo.toml
@@ -58,7 +58,7 @@ keccak-hash = "0.1.2"
 parity-reactor = { path = "../util/reactor" }
 parity-updater = { path = "../updater" }
 parity-version = { path = "../util/version" }
-patricia-trie = "0.2.1"
+patricia-trie = "0.2"
 rlp = { version = "0.2.4", features = ["ethereum"] }
 stats = { path = "../util/stats" }
 vm = { path = "../ethcore/vm" }
diff --git a/rpc/src/authcodes.rs b/rpc/src/authcodes.rs
index 5b7309a3176..8fd47d553fc 100644
--- a/rpc/src/authcodes.rs
+++ b/rpc/src/authcodes.rs
@@ -50,8 +50,6 @@ impl TimeProvider for DefaultTimeProvider {
 const TIME_THRESHOLD: u64 = 7;
 /// minimal length of hash
 const TOKEN_LENGTH: usize = 16;
-/// special "initial" token used for authorization when there are no tokens yet.
-const INITIAL_TOKEN: &'static str = "initial";
 /// Separator between fields in serialized tokens file.
 const SEPARATOR: &'static str = ";";
 /// Number of seconds to keep unused tokens.
@@ -163,16 +161,6 @@ impl<T: TimeProvider> AuthCodes<T> {
 
 		let as_token = |code| keccak(format!("{}:{}", code, time));
 
-		// Check if it's the initial token.
-		if self.is_empty() {
-			let initial = &as_token(INITIAL_TOKEN) == hash;
-			// Initial token can be used only once.
-			if initial {
-				let _ = self.generate_new();
-			}
-			return initial;
-		}
-
 		// look for code
 		for code in &mut self.codes {
 			if &as_token(&code.code) == hash {
@@ -239,7 +227,7 @@ mod tests {
 	}
 
 	#[test]
-	fn should_return_true_if_code_is_initial_and_store_is_empty() {
+	fn should_return_false_even_if_code_is_initial_and_store_is_empty() {
 		// given
 		let code = "initial";
 		let time = 99;
@@ -250,7 +238,7 @@ mod tests {
 		let res2 = codes.is_valid(&generate_hash(code, time), time);
 
 		// then
-		assert_eq!(res1, true);
+		assert_eq!(res1, false);
 		assert_eq!(res2, false);
 	}
 
diff --git a/rpc/src/tests/ws.rs b/rpc/src/tests/ws.rs
index 91f10e64758..ed5e8299e8d 100644
--- a/rpc/src/tests/ws.rs
+++ b/rpc/src/tests/ws.rs
@@ -136,7 +136,7 @@ mod testing {
 	}
 
 	#[test]
-	fn should_allow_initial_connection_but_only_once() {
+	fn should_not_allow_initial_connection_even_once() {
 		// given
 		let (server, port, authcodes) = serve();
 		let code = "initial";
@@ -160,26 +160,9 @@ mod testing {
 			timestamp,
 			)
 		);
-		let response2 = http_client::request(server.addr(),
-			&format!("\
-				GET / HTTP/1.1\r\n\
-				Host: 127.0.0.1:{}\r\n\
-				Connection: Close\r\n\
-				Sec-WebSocket-Key: x3JJHMbDL1EzLkh9GBhXDw==\r\n\
-				Sec-WebSocket-Protocol:{:?}_{}\r\n\
-				Sec-WebSocket-Version: 13\r\n\
-				\r\n\
-				{{}}
-			",
-			port,
-			keccak(format!("{}:{}", code, timestamp)),
-			timestamp,
-			)
-		);
 
 		// then
-		assert_eq!(response1.status, "HTTP/1.1 101 Switching Protocols".to_owned());
-		assert_eq!(response2.status, "HTTP/1.1 403 Forbidden".to_owned());
-		http_client::assert_security_headers_present(&response2.headers, None);
+		assert_eq!(response1.status, "HTTP/1.1 403 Forbidden".to_owned());
+		http_client::assert_security_headers_present(&response1.headers, None);
 	}
 }
diff --git a/rpc/src/v1/helpers/light_fetch.rs b/rpc/src/v1/helpers/light_fetch.rs
index 6b1ecf493ba..acb8e7c0420 100644
--- a/rpc/src/v1/helpers/light_fetch.rs
+++ b/rpc/src/v1/helpers/light_fetch.rs
@@ -188,7 +188,7 @@ impl LightFetch {
 	}
 
 	/// Helper for getting proved execution.
-	pub fn proved_execution(&self, req: CallRequest, num: Trailing<BlockNumber>) -> impl Future<Item = ExecutionResult, Error = Error> + Send {
+	pub fn proved_read_only_execution(&self, req: CallRequest, num: Trailing<BlockNumber>) -> impl Future<Item = ExecutionResult, Error = Error> + Send {
 		const DEFAULT_GAS_PRICE: u64 = 21_000;
 		// starting gas when gas not provided.
 		const START_GAS: u64 = 50_000;
@@ -247,19 +247,20 @@ impl LightFetch {
 		}).join(header_fut).and_then(move |((gas_known, tx), hdr)| {
 			// then request proved execution.
 			// TODO: get last-hashes from network.
-			let env_info = match client.env_info(id) {
+			let hash = hdr.hash();
+			let env_info = match client.env_info(BlockId::Hash(hash)) {
 				Some(env_info) => env_info,
 				_ => return Either::A(future::err(errors::unknown_block())),
 			};
 
-			Either::B(execute_tx(gas_known, ExecuteParams {
-				from: from,
-				tx: tx,
-				hdr: hdr,
-				env_info: env_info,
+			Either::B(execute_read_only_tx(gas_known, ExecuteParams {
+				from,
+				tx,
+				hdr,
+				env_info,
 				engine: client.engine().clone(),
-				on_demand: on_demand,
-				sync: sync,
+				on_demand,
+				sync,
 			}))
 		}))
 	}
@@ -598,10 +599,10 @@ struct ExecuteParams {
 
 // has a peer execute the transaction with given params. If `gas_known` is false,
 // this will double the gas on each `OutOfGas` error.
-fn execute_tx(gas_known: bool, params: ExecuteParams) -> impl Future<Item = ExecutionResult, Error = Error> + Send {
+fn execute_read_only_tx(gas_known: bool, params: ExecuteParams) -> impl Future<Item = ExecutionResult, Error = Error> + Send {
 	if !gas_known {
 		Box::new(future::loop_fn(params, |mut params| {
-			execute_tx(true, params.clone()).and_then(move |res| {
+			execute_read_only_tx(true, params.clone()).and_then(move |res| {
 				match res {
 					Ok(executed) => {
 						// TODO: how to distinguish between actual OOG and
diff --git a/rpc/src/v1/impls/light/eth.rs b/rpc/src/v1/impls/light/eth.rs
index e36716fc306..67e2c72ab61 100644
--- a/rpc/src/v1/impls/light/eth.rs
+++ b/rpc/src/v1/impls/light/eth.rs
@@ -398,7 +398,7 @@ impl<T: LightChainClient + 'static> Eth for EthClient<T> {
 	}
 
 	fn call(&self, req: CallRequest, num: Trailing<BlockNumber>) -> BoxFuture<Bytes> {
-		Box::new(self.fetcher().proved_execution(req, num).and_then(|res| {
+		Box::new(self.fetcher().proved_read_only_execution(req, num).and_then(|res| {
 			match res {
 				Ok(exec) => Ok(exec.output.into()),
 				Err(e) => Err(errors::execution(e)),
@@ -408,7 +408,7 @@ impl<T: LightChainClient + 'static> Eth for EthClient<T> {
 
 	fn estimate_gas(&self, req: CallRequest, num: Trailing<BlockNumber>) -> BoxFuture<RpcU256> {
 		// TODO: binary chop for more accurate estimates.
-		Box::new(self.fetcher().proved_execution(req, num).and_then(|res| {
+		Box::new(self.fetcher().proved_read_only_execution(req, num).and_then(|res| {
 			match res {
 				Ok(exec) => Ok((exec.refunded + exec.gas_used).into()),
 				Err(e) => Err(errors::execution(e)),
diff --git a/rpc/src/v1/impls/net.rs b/rpc/src/v1/impls/net.rs
index 74521d81356..e86bd253f7a 100644
--- a/rpc/src/v1/impls/net.rs
+++ b/rpc/src/v1/impls/net.rs
@@ -22,7 +22,12 @@ use v1::traits::Net;
 
 /// Net rpc implementation.
 pub struct NetClient<S: ?Sized> {
-	sync: Arc<S>
+	sync: Arc<S>,
+	/// Cached `network_id`.
+	///
+	/// We cache it to avoid redundant aquire of sync read lock.
+	/// https://github.com/paritytech/parity-ethereum/issues/8746
+	network_id: u64,
 }
 
 impl<S: ?Sized> NetClient<S> where S: SyncProvider {
@@ -30,17 +35,18 @@ impl<S: ?Sized> NetClient<S> where S: SyncProvider {
 	pub fn new(sync: &Arc<S>) -> Self {
 		NetClient {
 			sync: sync.clone(),
+			network_id: sync.status().network_id,
 		}
 	}
 }
 
 impl<S: ?Sized> Net for NetClient<S> where S: SyncProvider + 'static {
 	fn version(&self) -> Result<String> {
-		Ok(format!("{}", self.sync.status().network_id).to_owned())
+		Ok(format!("{}", self.network_id))
 	}
 
 	fn peer_count(&self) -> Result<String> {
-		Ok(format!("0x{:x}", self.sync.status().num_peers as u64).to_owned())
+		Ok(format!("{:#x}", self.sync.status().num_peers as u64))
 	}
 
 	fn is_listening(&self) -> Result<bool> {
diff --git a/scripts/aura-test.sh b/scripts/aura-test.sh
deleted file mode 100755
index 0c39e12f4d1..00000000000
--- a/scripts/aura-test.sh
+++ /dev/null
@@ -1,12 +0,0 @@
-#!/usr/bin/env bash
-set -e # fail on any error
-set -u # treat unset variables as error
-
-cargo build -j $(nproc) --release --features final $CARGOFLAGS
-git clone https://github.com/paritytech/parity-import-tests
-cp target/release/parity parity-import-tests/aura/parity
-cd parity-import-tests/aura
-echo "Start Aura test"
-./parity import blocks.rlp --chain chain.json
-./parity restore snap --chain chain.json
-echo "Aura test complete"
diff --git a/docker/README.md b/scripts/docker/README.md
similarity index 100%
rename from docker/README.md
rename to scripts/docker/README.md
diff --git a/docker/alpine/Dockerfile b/scripts/docker/alpine/Dockerfile
similarity index 100%
rename from docker/alpine/Dockerfile
rename to scripts/docker/alpine/Dockerfile
diff --git a/docker/centos/Dockerfile b/scripts/docker/centos/Dockerfile
similarity index 100%
rename from docker/centos/Dockerfile
rename to scripts/docker/centos/Dockerfile
diff --git a/docker/centos/Dockerfile.build b/scripts/docker/centos/Dockerfile.build
similarity index 100%
rename from docker/centos/Dockerfile.build
rename to scripts/docker/centos/Dockerfile.build
diff --git a/docker/centos/build.sh b/scripts/docker/centos/build.sh
similarity index 100%
rename from docker/centos/build.sh
rename to scripts/docker/centos/build.sh
diff --git a/docker/hub/Dockerfile b/scripts/docker/hub/Dockerfile
similarity index 77%
rename from docker/hub/Dockerfile
rename to scripts/docker/hub/Dockerfile
index 4eec8cfc61c..53fa092ef9e 100644
--- a/docker/hub/Dockerfile
+++ b/scripts/docker/hub/Dockerfile
@@ -15,8 +15,17 @@ RUN apt autoremove -y
 RUN apt clean -y
 RUN rm -rf /tmp/* /var/tmp/* /var/lib/apt/lists/*
 
+RUN groupadd -g 1000 parity \
+  && useradd -m -u 1000 -g parity -s /bin/sh parity
+
+USER parity
+
+WORKDIR /home/parity
+
+ENV PATH "~/bin:${PATH}"
+
 #add TARGET to docker image
-COPY artifacts/x86_64-unknown-linux-gnu/$TARGET /usr/bin/$TARGET
+COPY artifacts/x86_64-unknown-linux-gnu/$TARGET ./bin/$TARGET
 
 # Build a shell script because the ENTRYPOINT command doesn't like using ENV
 RUN echo "#!/bin/bash \n ${TARGET} \$@" > ./entrypoint.sh
diff --git a/docker/ubuntu-aarch64/Dockerfile b/scripts/docker/ubuntu-aarch64/Dockerfile
similarity index 100%
rename from docker/ubuntu-aarch64/Dockerfile
rename to scripts/docker/ubuntu-aarch64/Dockerfile
diff --git a/docker/ubuntu-arm/Dockerfile b/scripts/docker/ubuntu-arm/Dockerfile
similarity index 100%
rename from docker/ubuntu-arm/Dockerfile
rename to scripts/docker/ubuntu-arm/Dockerfile
diff --git a/scripts/gitlab-rpc-docs.sh b/scripts/gitlab-rpc-docs.sh
deleted file mode 100755
index de03fc69f26..00000000000
--- a/scripts/gitlab-rpc-docs.sh
+++ /dev/null
@@ -1,53 +0,0 @@
-#!/usr/bin/env bash
-
-clone_repos() {
-    git clone https://github.com/parity-js/jsonrpc.git jsonrpc
-    git clone https://github.com/paritytech/wiki.git wiki
-}
-
-build_docs() {
-    npm install
-    npm run build:markdown
-}
-
-update_wiki_docs() {
-    for file in $(ls jsonrpc/docs); do
-        module_name=${file:0:-3}
-        mv jsonrpc/docs/$file wiki/JSONRPC-$module_name-module.md
-    done
-}
-
-set_remote_wiki() {
-    git config remote.origin.url "https://${GITHUB_TOKEN}@github.com/paritytech/wiki.git"
-}
-
-setup_git() {
-    git config --global user.email "devops@parity.com"
-    git config --global user.name "Devops Parity"
-}
-
-commit_files() {
-    git checkout -b rpcdoc-update-${CI_COMMIT_REF_NAME}
-    git add .
-    git commit -m "Update docs to ${CI_COMMIT_REF_NAME}"
-    git tag -a "${CI_COMMIT_REF_NAME}" -m "Updated to ${CI_COMMIT_REF_NAME}"
-}
-
-upload_files() {
-    git push --tags
-}
-
-PROJECT_DIR=$(pwd)
-
-setup_git
-cd ..
-clone_repos
-cp -r $PROJECT_DIR jsonrpc/.parity
-cd jsonrpc
-build_docs
-cd ..
-update_wiki_docs
-cd wiki
-set_remote_wiki
-commit_files
-upload_files
diff --git a/scripts/gitlab/build-unix.sh b/scripts/gitlab/build-unix.sh
index 50ae7314c3d..00933f1eeb7 100755
--- a/scripts/gitlab/build-unix.sh
+++ b/scripts/gitlab/build-unix.sh
@@ -2,13 +2,19 @@
 
 set -e # fail on any error
 set -u # treat unset variables as error
+
 echo "__________Show ENVIROMENT__________"
-echo "CC:       " $CC
-echo "CXX:      " $CXX
+echo "CI_SERVER_NAME:   " $CI_SERVER_NAME
+echo "CARGO_HOME:       " $CARGO_HOME
+echo "BUILD_TARGET:     " $BUILD_TARGET
+echo "BUILD_ARCH:       " $BUILD_ARCH
+echo "CARGO_TARGET:     " $CARGO_TARGET
+echo "CC:               " $CC
+echo "CXX:              " $CXX
 
 echo "__________CARGO CONFIG__________"
-rm -rf .cargo
 mkdir -p .cargo
+rm -f .cargo/config
 echo "[target.$CARGO_TARGET]" >> .cargo/config
 echo "linker= \"$CC\"" >> .cargo/config
 cat .cargo/config
@@ -26,10 +32,15 @@ mkdir -p artifacts
 cd artifacts
 mkdir -p $CARGO_TARGET
 cd $CARGO_TARGET
-cp ../../target/$CARGO_TARGET/release/{parity,parity-evm,ethstore,ethkey,whisper} .
+cp ../../target/$CARGO_TARGET/release/parity ./parity
+cp ../../target/$CARGO_TARGET/release/parity-evm ./parity-evm
+cp ../../target/$CARGO_TARGET/release/ethstore ./ethstore
+cp ../../target/$CARGO_TARGET/release/ethkey ./ethkey
+cp ../../target/$CARGO_TARGET/release/whisper ./whisper
 strip -v ./*
 echo "_____ Calculating checksums _____"
 for binary in $(ls)
 do
   rhash --sha256 $binary -o $binary.sha256
+  ./parity tools hash $binary > $binary.sha3
 done
diff --git a/scripts/gitlab/build-windows.sh b/scripts/gitlab/build-windows.sh
index a5510875c87..afd4c64a601 100755
--- a/scripts/gitlab/build-windows.sh
+++ b/scripts/gitlab/build-windows.sh
@@ -5,19 +5,26 @@ set -u # treat unset variables as error
 set INCLUDE="C:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\Include;C:\vs2015\VC\include;C:\Program Files (x86)\Windows Kits\10\Include\10.0.10240.0\ucrt"
 set LIB="C:\vs2015\VC\lib;C:\Program Files (x86)\Windows Kits\10\Lib\10.0.10240.0\ucrt\x64"
 
-rustup default stable-x86_64-pc-windows-msvc
-echo "_____ Building _____"
+echo "__________Show ENVIROMENT__________"
+echo "CI_SERVER_NAME:   " $CI_SERVER_NAME
+echo "CARGO_HOME:       " $CARGO_HOME
+echo "BUILD_TARGET:     " $BUILD_TARGET
+echo "BUILD_ARCH:       " $BUILD_ARCH
+echo "CARGO_TARGET:     " $CARGO_TARGET
+
+echo "_____ Building target: "$CARGO_TARGET" _____"
 time cargo build --target $CARGO_TARGET --release --features final
 time cargo build --target $CARGO_TARGET --release -p evmbin
 time cargo build --target $CARGO_TARGET --release -p ethstore-cli
 time cargo build --target $CARGO_TARGET --release -p ethkey-cli
 time cargo build --target $CARGO_TARGET --release -p whisper-cli
+
 echo "__________Sign binaries__________"
-scripts/gitlab/sign.cmd $keyfile $certpass target/$CARGO_TARGET/release/parity.exe
-scripts/gitlab/sign.cmd $keyfile $certpass target/$CARGO_TARGET/release/parity-evm.exe
-scripts/gitlab/sign.cmd $keyfile $certpass target/$CARGO_TARGET/release/ethstore.exe
-scripts/gitlab/sign.cmd $keyfile $certpass target/$CARGO_TARGET/release/ethkey.exe
-scripts/gitlab/sign.cmd $keyfile $certpass target/$CARGO_TARGET/release/whisper.exe
+scripts/gitlab/sign-win.cmd $keyfile $certpass target/$CARGO_TARGET/release/parity.exe
+scripts/gitlab/sign-win.cmd $keyfile $certpass target/$CARGO_TARGET/release/parity-evm.exe
+scripts/gitlab/sign-win.cmd $keyfile $certpass target/$CARGO_TARGET/release/ethstore.exe
+scripts/gitlab/sign-win.cmd $keyfile $certpass target/$CARGO_TARGET/release/ethkey.exe
+scripts/gitlab/sign-win.cmd $keyfile $certpass target/$CARGO_TARGET/release/whisper.exe
 
 echo "_____ Post-processing binaries _____"
 rm -rf artifacts
@@ -25,11 +32,17 @@ mkdir -p artifacts
 cd artifacts
 mkdir -p $CARGO_TARGET
 cd $CARGO_TARGET
-cp --verbose ../../target/$CARGO_TARGET/release/{parity.exe,parity-evm.exe,ethstore.exe,ethkey.exe,whisper.exe} .
+cp --verbose ../../target/$CARGO_TARGET/release/parity.exe ./parity.exe
+cp --verbose ../../target/$CARGO_TARGET/release/parity-evm.exe ./parity-evm.exe
+cp --verbose ../../target/$CARGO_TARGET/release/ethstore.exe ./ethstore.exe
+cp --verbose ../../target/$CARGO_TARGET/release/ethkey.exe ./ethkey.exe
+cp --verbose ../../target/$CARGO_TARGET/release/whisper.exe ./whisper.exe
 
 echo "_____ Calculating checksums _____"
 for binary in $(ls)
 do
   rhash --sha256 $binary -o $binary.sha256
+  ./parity.exe tools hash $binary > $binary.sha3
 done
 cp parity.exe.sha256 parity.sha256
+cp parity.exe.sha3 parity.sha3
diff --git a/scripts/gitlab/cargo-audit.sh b/scripts/gitlab/cargo-audit.sh
new file mode 100755
index 00000000000..1e53f77cd4c
--- /dev/null
+++ b/scripts/gitlab/cargo-audit.sh
@@ -0,0 +1,7 @@
+#!/bin/bash
+
+set -e # fail on any error
+set -u # treat unset variables as error
+
+CARGO_TARGET_DIR=./target cargo +stable install cargo-audit --force
+cargo +stable audit
diff --git a/scripts/gitlab/clippy.sh b/scripts/gitlab/clippy.sh
deleted file mode 100755
index aef39c29fbc..00000000000
--- a/scripts/gitlab/clippy.sh
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/bash
-
-set -e # fail on any error
-set -u # treat unset variables as error
-
-cargo install clippy
-cargo clippy -- -D warnings
diff --git a/scripts/gitlab/coverage.sh b/scripts/gitlab/coverage.sh
deleted file mode 100755
index 38d01cb1faf..00000000000
--- a/scripts/gitlab/coverage.sh
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/bin/bash
-
-set -x
-git submodule update --init --recursive
-rm -rf target/*
-cargo test --all --exclude evmjit --no-run -- --test-threads 8|| exit $?
-KCOV_TARGET="target/cov"
-KCOV_FLAGS="--verify"
-mkdir -p $KCOV_TARGET
-echo "__________Cover RUST___________"
-for FILE in `find target/debug/deps ! -name "*.*" -type f`
-do
-  timeout --signal=SIGKILL 5m kcov --include-path=$(pwd) --exclude-path=$(pwd)/target $KCOV_FLAGS $KCOV_TARGET $FILE
-done
-timeout --signal=SIGKILL 5m kcov --include-path=$(pwd) --exclude-path=$(pwd)/target $KCOV_FLAGS $KCOV_TARGET target/debug/parity-*
-
-bash <(curl -s https://codecov.io/bash) &&
-  echo "Uploaded code coverage"
-
-exit 0
diff --git a/scripts/gitlab/rpc-docs.sh b/scripts/gitlab/docs-jsonrpc.sh
similarity index 77%
rename from scripts/gitlab/rpc-docs.sh
rename to scripts/gitlab/docs-jsonrpc.sh
index 86e751412d2..3c00fe4ea06 100755
--- a/scripts/gitlab/rpc-docs.sh
+++ b/scripts/gitlab/docs-jsonrpc.sh
@@ -29,29 +29,35 @@ setup_git() {
     git config user.name "Devops Parity"
 }
 
+set_remote_wiki() {
+    git config remote.origin.url "https://${GITHUB_TOKEN}@github.com/paritytech/wiki.git"
+}
+
 commit_files() {
     echo "__________Commit files__________"
     git checkout -b rpcdoc-update-${CI_COMMIT_REF_NAME}
     git add .
     git commit -m "Update docs to ${CI_COMMIT_REF_NAME}"
-    git tag -a "${CI_COMMIT_REF_NAME}"
+    git tag -a "${CI_COMMIT_REF_NAME}" -m "Update RPC docs to ${CI_COMMIT_REF_NAME}"
 }
 
 upload_files() {
     echo "__________Upload files__________"
+    git push origin HEAD
     git push --tags
 }
 
-RPC_TRAITS_DIR="rpc/src/v1/traits/"
+RPC_TRAITS_DIR="rpc/src/v1/traits"
 
 setup_git
 clone_repos
 mkdir -p "jsonrpc/.parity/$RPC_TRAITS_DIR"
-cp -r "$RPC_TRAITS_DIR" "jsonrpc/.parity/$RPC_TRAITS_DIR"
+cp $RPC_TRAITS_DIR/*.rs "jsonrpc/.parity/$RPC_TRAITS_DIR"
 cd jsonrpc
 build_docs
 cd ..
 update_wiki_docs
 cd wiki
+set_remote_wiki
 commit_files
 upload_files
diff --git a/scripts/gitlab/install-readme.sh b/scripts/gitlab/install-readme.sh
deleted file mode 100755
index 531bae9b77a..00000000000
--- a/scripts/gitlab/install-readme.sh
+++ /dev/null
@@ -1,8 +0,0 @@
-echo "Parity Wallet
-=============
-
-Welcome to Parity Wallet, your all-in-one Ethereum node and wallet.
-
-If you continue, Parity will be installed as a user service. You will be able to use the Parity Wallet through your browser by using the menu bar icon, following the shortcut in the Launchpad or navigating to http://localhost:8180/ in your browser.
-
-Parity is distributed under the terms of the GPL."
diff --git a/scripts/gitlab/package-snap.sh b/scripts/gitlab/package-snap.sh
deleted file mode 100755
index 168ab475155..00000000000
--- a/scripts/gitlab/package-snap.sh
+++ /dev/null
@@ -1,25 +0,0 @@
-#!/bin/bash
-
-set -e # fail on any error
-set -u # treat unset variables as error
-case ${CI_COMMIT_REF_NAME} in
-  nightly|*v2.1*) export GRADE="devel";;
-  beta|*v2.0*) export GRADE="stable";;
-  stable|*v1.11*) export GRADE="stable";;
-  *) echo "No release" exit 0;;
-esac
-SNAP_PACKAGE="parity_"$VERSION"_"$BUILD_ARCH".snap"
-echo "__________Create snap package__________"
-echo "Release channel :" $GRADE " Branch/tag: " $CI_COMMIT_REF_NAME
-snapcraft clean
-echo $VERSION:$GRADE:$BUILD_ARCH
-cat scripts/gitlab/templates/snapcraft.template.yaml | envsubst '$VERSION:$GRADE:$BUILD_ARCH:$CARGO_TARGET' > snapcraft.yaml
-cat snapcraft.yaml
-snapcraft --target-arch=$BUILD_ARCH
-ls *.snap
-echo "__________Post-processing snap package__________"
-mkdir -p artifacts
-mv -v $SNAP_PACKAGE "artifacts/"$SNAP_PACKAGE
-echo "_____ Calculating checksums _____"
-cd artifacts
-rhash --sha256 $SNAP_PACKAGE -o $SNAP_PACKAGE".sha256"
diff --git a/scripts/gitlab/publish-awss3.sh b/scripts/gitlab/publish-awss3.sh
new file mode 100755
index 00000000000..9ef0435f5ba
--- /dev/null
+++ b/scripts/gitlab/publish-awss3.sh
@@ -0,0 +1,49 @@
+#!/bin/bash
+
+set -e # fail on any error
+set -u # treat unset variables as error
+
+echo "__________Register Release__________"
+DATA="secret=$RELEASES_SECRET"
+
+echo "Pushing release to Mainnet"
+./scripts/gitlab/safe-curl.sh $DATA "http://update.parity.io:1337/push-release/$CI_COMMIT_REF_NAME/$CI_COMMIT_SHA"
+
+echo "Pushing release to Kovan"
+./scripts/gitlab/safe-curl.sh $DATA "http://update.parity.io:1338/push-release/$CI_COMMIT_REF_NAME/$CI_COMMIT_SHA"
+
+cd artifacts
+ls -l | sort -k9
+filetest=( * )
+echo ${filetest[*]}
+for DIR in "${filetest[@]}";
+do
+  cd $DIR
+  if [[ $DIR =~ "windows" ]];
+    then
+      WIN=".exe";
+    else
+      WIN="";
+  fi
+  sha3=$(cat parity.sha3 | awk '{print $1}')
+  case $DIR in
+    x86_64* )
+      DATA="commit=$CI_COMMIT_SHA&sha3=$sha3&filename=parity$WIN&secret=$RELEASES_SECRET"
+      ../../scripts/gitlab/safe-curl.sh $DATA "http://update.parity.io:1337/push-build/$CI_COMMIT_REF_NAME/$DIR"
+      # Kovan
+      ../../scripts/gitlab/safe-curl.sh $DATA "http://update.parity.io:1338/push-build/$CI_COMMIT_REF_NAME/$DIR"
+      ;;
+  esac
+  cd ..
+done
+
+echo "__________Push binaries to AWS S3____________"
+aws configure set aws_access_key_id $s3_key
+aws configure set aws_secret_access_key $s3_secret
+if [[ "$CI_COMMIT_REF_NAME" = "beta" || "$CI_COMMIT_REF_NAME" = "stable" || "$CI_COMMIT_REF_NAME" = "nightly" ]];
+  then
+    export S3_BUCKET=builds-parity-published;
+  else
+    export S3_BUCKET=builds-parity;
+fi
+aws s3 sync ./ s3://$S3_BUCKET/$CI_COMMIT_REF_NAME/
diff --git a/scripts/gitlab/publish-docker.sh b/scripts/gitlab/publish-docker.sh
index 41c2e3db48a..e4d2007b95c 100755
--- a/scripts/gitlab/publish-docker.sh
+++ b/scripts/gitlab/publish-docker.sh
@@ -3,9 +3,9 @@
 set -e # fail on any error
 set -u # treat unset variables as error
 
-if [ "$CI_COMMIT_REF_NAME" == "beta" ];
-then export DOCKER_BUILD_TAG="latest";
-else export DOCKER_BUILD_TAG=$CI_COMMIT_REF_NAME;
+if [ "$CI_COMMIT_REF_NAME" == "master" ];
+	then export DOCKER_BUILD_TAG="latest";
+	else export DOCKER_BUILD_TAG=$CI_COMMIT_REF_NAME;
 fi
 docker login -u $Docker_Hub_User_Parity -p $Docker_Hub_Pass_Parity
 
@@ -17,6 +17,6 @@ export DOCKER_TARGET=$1
 echo $DOCKER_TARGET
 
 echo "__________Docker build and push__________"
-docker build --build-arg TARGET=$DOCKER_TARGET --no-cache=true --tag parity/$DOCKER_TARGET:$DOCKER_BUILD_TAG -f docker/hub/Dockerfile .
+docker build --build-arg TARGET=$DOCKER_TARGET --no-cache=true --tag parity/$DOCKER_TARGET:$DOCKER_BUILD_TAG -f scripts/docker/hub/Dockerfile .
 docker push parity/$DOCKER_TARGET:$DOCKER_BUILD_TAG
 docker logout
diff --git a/scripts/gitlab/publish-snap.sh b/scripts/gitlab/publish-snap.sh
deleted file mode 100755
index 35644c8d754..00000000000
--- a/scripts/gitlab/publish-snap.sh
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/bin/bash
-
-set -e # fail on any error
-set -u # treat unset variables as error
-
-case ${CI_COMMIT_REF_NAME} in
-  nightly|*v2.1*) export CHANNEL="edge";;
-  beta|*v2.0*) export CHANNEL="beta";;
-  stable|*v1.11*) export CHANNEL="stable";;
-  *) echo "No release" exit 0;;
-esac
-echo "Release channel :" $CHANNEL " Branch/tag: " $CI_COMMIT_REF_NAME
-
-echo $SNAPCRAFT_LOGIN_PARITY_BASE64 | base64 --decode > snapcraft.login
-snapcraft login --with snapcraft.login
-snapcraft push --release $CHANNEL "artifacts/parity_"$VERSION"_"$BUILD_ARCH".snap"
-snapcraft status parity
-snapcraft logout
diff --git a/scripts/gitlab/push.sh b/scripts/gitlab/push.sh
deleted file mode 100755
index 15e7667e540..00000000000
--- a/scripts/gitlab/push.sh
+++ /dev/null
@@ -1,67 +0,0 @@
-#!/bin/bash
-
-set -e # fail on any error
-set -u # treat unset variables as error
-updater_push_release () {
-  echo "push release"
-  # Mainnet
-
-}
-echo "__________Set ENVIROMENT__________"
-DESCRIPTION="$(cat CHANGELOG.md)"
-RELEASE_TABLE="$(cat scripts/gitlab/templates/release-table.md)"
-RELEASE_TABLE="$(echo "${RELEASE_TABLE//\$VERSION/${VERSION}}")"
-#The text in the file CANGELOG.md before which the table with links is inserted. Must be present in this file necessarily
-REPLACE_TEXT="The full list of included changes:"
-case ${CI_COMMIT_REF_NAME} in
-  nightly|*v2.1*) NAME="Parity "$VERSION" nightly";;
-  beta|*v2.0*) NAME="Parity "$VERSION" beta";;
-  stable|*v1.11*) NAME="Parity "$VERSION" stable";;
-  *) echo "No release" exit 0;;
-esac
-cd artifacts
-ls -l | sort -k9
-filetest=( * )
-echo ${filetest[*]}
-for DIR in "${filetest[@]}";
-do
-  cd $DIR
-  if [[ $DIR == "*windows*" ]];
-    then
-      WIN=".exe";
-    else
-      WIN="";
-  fi
-  for binary in $(ls parity.sha256)
-  do
-    sha256=$(cat $binary | awk '{ print $1}' )
-    case $DIR in
-      x86_64* )
-        DATA="commit=$CI_BUILD_REF&sha3=$sha256&filename=parity$WIN&secret=$RELEASES_SECRET"
-        ../../scripts/gitlab/safe_curl.sh $DATA "http://update.parity.io:1337/push-build/$CI_BUILD_REF_NAME/$DIR"
-        # Kovan
-        ../../scripts/gitlab/safe_curl.sh $DATA "http://update.parity.io:1338/push-build/$CI_BUILD_REF_NAME/$DIR"
-        ;;
-    esac
-    RELEASE_TABLE="$(echo "${RELEASE_TABLE/sha$DIR/${sha256}}")"
-  done
-  cd ..
-done
-#do not touch the following 3 lines. Features of output in Markdown
-DESCRIPTION="$(echo "${DESCRIPTION/${REPLACE_TEXT}/${RELEASE_TABLE}
-
-${REPLACE_TEXT}}")"
-echo "$DESCRIPTION"
-if [[ "$CI_COMMIT_REF_NAME" == "nightly" ]]; then DESCRIPTION=""; fi #TODO in the future, we need to prepare a script that will do changelog
-echo "__________Create release to Github____________"
-github-release release --user devops-parity --repo parity-ethereum --tag "$CI_COMMIT_REF_NAME" --draft --name "$NAME" --description "$DESCRIPTION"
-echo "__________Push binaries to AWS S3____________"
-aws configure set aws_access_key_id $s3_key
-aws configure set aws_secret_access_key $s3_secret
-if [[ "$CI_BUILD_REF_NAME" = "beta" || "$CI_BUILD_REF_NAME" = "stable" || "$CI_BUILD_REF_NAME" = "nightly" ]];
-  then
-    export S3_BUCKET=builds-parity-published;
-  else
-    export S3_BUCKET=builds-parity;
-fi
-aws s3 sync ./ s3://$S3_BUCKET/$CI_BUILD_REF_NAME/
diff --git a/scripts/gitlab/rustfmt.sh b/scripts/gitlab/rustfmt.sh
deleted file mode 100755
index 447d66f24ec..00000000000
--- a/scripts/gitlab/rustfmt.sh
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/bash
-
-set -e # fail on any error
-set -u # treat unset variables as error
-
-cargo install rustfmt-nightly
-cargo fmt -- --write-mode=diff
diff --git a/scripts/gitlab/safe_curl.sh b/scripts/gitlab/safe-curl.sh
similarity index 100%
rename from scripts/gitlab/safe_curl.sh
rename to scripts/gitlab/safe-curl.sh
diff --git a/scripts/gitlab/sign.cmd b/scripts/gitlab/sign-win.cmd
similarity index 100%
rename from scripts/gitlab/sign.cmd
rename to scripts/gitlab/sign-win.cmd
diff --git a/scripts/gitlab/templates/release-table.md b/scripts/gitlab/templates/release-table.md
deleted file mode 100644
index 6145521524e..00000000000
--- a/scripts/gitlab/templates/release-table.md
+++ /dev/null
@@ -1,16 +0,0 @@
-| OS | Arch | Download | SHA256 Checksum |
-|:---:|:---:|:---|:---|
-| linux | arm64 | [parity](https://releases.parity.io/$VERSION/aarch64-unknown-linux-gnu/parity) | <sup>`shaaarch64-unknown-linux-gnu`</sup> |
-| android | armv7 | [parity](https://releases.parity.io/$VERSION/armv7-linux-androideabi/parity) | <sup>`shaarmv7-linux-androideabi`</sup> |
-| linux | armv7 | [parity](https://releases.parity.io/$VERSION/armv7-unknown-linux-gnueabihf/parity) | <sup>`shaarmv7-unknown-linux-gnueabihf`</sup> |
-| linux | i686 | [parity](https://releases.parity.io/$VERSION/i686-unknown-linux-gnu/parity) | <sup>`shai686-unknown-linux-gnu`</sup> |
-| osx | x64 | [parity](https://releases.parity.io/$VERSION/x86_64-apple-darwin/parity) | <sup>`shax86_64-apple-darwin`</sup> |
-| windows | x64 | [parity.exe](https://releases.parity.io/$VERSION/x86_64-pc-windows-msvc/parity.exe) | <sup>`shax86_64-pc-windows-msvc`</sup> |
-| linux | x64 | [parity](https://releases.parity.io/$VERSION/x86_64-unknown-linux-gnu/parity) | <sup>`shax86_64-unknown-linux-gnu`</sup> |
-
-| OS | Alternative | Link |
-|:---:|:---:|:---|
-| <img src="https://gist.github.com/5chdn/1fce888fde1d773761f809b607757f76/raw/44c4f0fc63f1ea8e61a9513af5131ef65eaa6c75/apple.png" alt="Apple Icon by Pixel Perfect from https://www.flaticon.com/authors/pixel-perfect" style="width: 32px;"/> | Homebrew |[github.com/paritytech/homebrew-paritytech/blob/master/README.md](https://github.com/paritytech/homebrew-paritytech/blob/master/README.md) |
-| <img src="https://gist.github.com/5chdn/1fce888fde1d773761f809b607757f76/raw/44c4f0fc63f1ea8e61a9513af5131ef65eaa6c75/linux.png" alt="Linux Icon by Pixel Perfect from https://www.flaticon.com/authors/pixel-perfect" style="width: 32px;"/> | Snapcraft | [snapcraft.io/parity](https://snapcraft.io/parity/) |
-| <img src="https://gist.github.com/5chdn/1fce888fde1d773761f809b607757f76/raw/44c4f0fc63f1ea8e61a9513af5131ef65eaa6c75/settings.png" alt="Settings Icon by Pixel Perfect from https://www.flaticon.com/authors/pixel-perfect" style="width: 32px;"/> | Docker | [hub.docker.com/r/parity/parity](https://hub.docker.com/r/parity/parity) |
-| <img src="https://gist.github.com/5chdn/1fce888fde1d773761f809b607757f76/raw/44c4f0fc63f1ea8e61a9513af5131ef65eaa6c75/settings.png" alt="Settings Icon by Pixel Perfect from https://www.flaticon.com/authors/pixel-perfect" style="width: 32px;"/> | Other binaries | [vanity-service.parity.io/parity-binaries?format=markdown&version=$VERSION](https://vanity-service.parity.io/parity-binaries?format=markdown&version=$VERSION) |
diff --git a/scripts/gitlab/templates/snapcraft.template.yaml b/scripts/gitlab/templates/snapcraft.template.yaml
deleted file mode 100644
index 97bb39aa14a..00000000000
--- a/scripts/gitlab/templates/snapcraft.template.yaml
+++ /dev/null
@@ -1,58 +0,0 @@
-name:               parity
-version:            $VERSION
-architectures:      [$BUILD_ARCH]
-grade:              $GRADE
-confinement:        strict
-
-summary:            Fast, light, robust Ethereum implementation
-description:        |
-  Parity's goal is to be the fastest, lightest, and most secure Ethereum
-  client. We are developing Parity using the sophisticated and cutting-edge
-  Rust programming language. Parity is licensed under the GPLv3, and can be
-  used for all your Ethereum needs.
-
-
-apps:
-  parity:
-    command:        parity
-    plugs:          [home, network, network-bind, mount-observe, x11, unity7, desktop, desktop-legacy, wayland]
-    desktop:        usr/share/applications/parity.desktop
-  parity-evm:
-    command:        parity-evm
-    plugs:          [home, network, network-bind]
-  ethkey:
-    command:        ethkey
-    plugs:          [home]
-  ethstore:
-    command:        ethstore
-    plugs:          [home]
-  whisper:
-    command:        whisper
-    plugs:          [home]
-
-icon:               snap/gui/icon.png
-
-parts:
-  desktop-icon:
-    source:         ./snap
-    plugin:         nil
-    override-build:        |
-      mkdir -p $SNAPCRAFT_PART_INSTALL/usr/share/applications
-      mkdir -p $SNAPCRAFT_PART_INSTALL/usr/share/pixmaps
-      cp -v gui/parity.desktop $SNAPCRAFT_PART_INSTALL/usr/share/applications/
-      cp -v gui/icon.png $SNAPCRAFT_PART_INSTALL/usr/share/pixmaps/
-  parity:
-    source:         ./artifacts/$CARGO_TARGET
-    plugin:         nil
-    override-build:        |
-      mkdir -p $SNAPCRAFT_PART_INSTALL/usr/bin
-      cp -v parity $SNAPCRAFT_PART_INSTALL/usr/bin/parity
-      cp -v parity-evm $SNAPCRAFT_PART_INSTALL/usr/bin/parity-evm
-      cp -v ethkey $SNAPCRAFT_PART_INSTALL/usr/bin/ethkey
-      cp -v ethstore $SNAPCRAFT_PART_INSTALL/usr/bin/ethstore
-      cp -v whisper $SNAPCRAFT_PART_INSTALL/usr/bin/whisper
-    stage-packages: [libc6, libssl1.0.0, libudev1, libstdc++6, cmake]
-  df:
-    plugin:         nil
-    stage-packages: [coreutils]
-    stage:          [bin/df]
diff --git a/scripts/gitlab/test-all.sh b/scripts/gitlab/test-all.sh
new file mode 100755
index 00000000000..15c22870626
--- /dev/null
+++ b/scripts/gitlab/test-all.sh
@@ -0,0 +1,35 @@
+#!/bin/bash
+# ARGUMENT $1 Rust flavor to test with (stable/beta/nightly)
+
+set -e # fail on any error
+set -u # treat unset variables as error
+
+git log --graph --oneline --decorate=short -n 10
+
+case ${SCHEDULE_TAG:-${CI_COMMIT_REF_NAME}} in
+  (beta|stable)
+    export GIT_COMPARE=origin/${SCHEDULE_TAG:-${CI_COMMIT_REF_NAME}}~
+    ;;
+  (master|nightly)
+    export GIT_COMPARE=master~
+    ;;
+  (*)
+    export GIT_COMPARE=master
+    ;;
+esac
+
+export RUST_FILES_MODIFIED="$(git --no-pager diff --name-only $GIT_COMPARE...$CI_COMMIT_SHA | grep -v -e ^\\. -e ^LICENSE -e ^README.md -e ^CHANGELOG.md -e ^test.sh -e ^scripts/ -e ^docs/ -e ^docker/ -e ^snap/ | wc -l | tr -d ' ')"
+echo "RUST_FILES_MODIFIED: $RUST_FILES_MODIFIED"
+
+if [ "${RUST_FILES_MODIFIED}" = "0" ]
+then
+  echo "__________Skipping Rust tests since no Rust files modified__________";
+  exit 0
+fi
+
+rustup default $1
+
+git submodule update --init --recursive
+rustup show
+
+exec ./test.sh
diff --git a/scripts/gitlab/test.sh b/scripts/gitlab/test.sh
deleted file mode 100755
index be48c52cca8..00000000000
--- a/scripts/gitlab/test.sh
+++ /dev/null
@@ -1,28 +0,0 @@
-#!/bin/bash
-# ARGUMENT $1 Rust flavor to test with (stable/beta/nightly)
-
-set -e # fail on any error
-set -u # treat unset variables as error
-
-rustup default $1
-
-if [[ "$CI_COMMIT_REF_NAME" = "beta" || "$CI_COMMIT_REF_NAME" = "stable" ]]; then
-  export GIT_COMPARE=$CI_COMMIT_REF_NAME~;
-else
-  export GIT_COMPARE=master;
-fi
-
-export RUST_FILES_MODIFIED="$(git --no-pager diff --name-only $GIT_COMPARE...$CI_COMMIT_SHA | grep -v -e ^\\. -e ^LICENSE -e ^README.md -e ^test.sh -e ^windows/ -e ^scripts/ -e ^mac/ -e ^nsis/ | wc -l)"
-echo "RUST_FILES_MODIFIED: $RUST_FILES_MODIFIED"
-
-git submodule update --init --recursive
-rustup show
-if [[ "${RUST_FILES_MODIFIED}" == "0" ]];
-then echo "__________Skipping Rust tests since no Rust files modified__________";
-else ./test.sh || exit $?;
-fi
-
-# if [[ "$CI_COMMIT_REF_NAME" == "nightly" ]];
-#   ### @TODO re-enable fail after https://github.com/paritytech/parity-import-tests/issues/3
-#   then sh scripts/aura-test.sh; # || exit $?;
-# fi
diff --git a/snap/gui/icon.png b/snap/gui/icon.png
deleted file mode 100644
index f0f22390f56..00000000000
Binary files a/snap/gui/icon.png and /dev/null differ
diff --git a/snap/gui/parity.desktop b/snap/gui/parity.desktop
deleted file mode 100644
index 1833865deab..00000000000
--- a/snap/gui/parity.desktop
+++ /dev/null
@@ -1,8 +0,0 @@
-[Desktop Entry]
-Type=Application
-Encoding=UTF-8
-Name=Parity Ethereum
-Comment=The fastest and most advanced Ethereum client.
-Exec=parity
-Icon=/usr/share/pixmaps/icon.png
-Terminal=true
diff --git a/test.sh b/test.sh
index 83d07b78bc9..63ea22d77f2 100755
--- a/test.sh
+++ b/test.sh
@@ -4,6 +4,7 @@
 FEATURES="json-tests"
 OPTIONS="--release"
 VALIDATE=1
+THREADS=8
 
 case $1 in
   --no-json)
@@ -29,31 +30,72 @@ esac
 
 set -e
 
-if [ "$VALIDATE" -eq "1" ]; then
-# Validate --no-default-features build
-echo "________Validate build________"
-time cargo check --no-default-features
-time cargo check --manifest-path util/io/Cargo.toml --no-default-features
-time cargo check --manifest-path util/io/Cargo.toml --features "mio"
 
-# Validate chainspecs
-echo "________Validate chainspecs________"
-time ./scripts/validate_chainspecs.sh
+validate () {
+  if [ "$VALIDATE" -eq "1" ]
+  then
+    echo "________Validate build________"
+    time cargo check $@ --no-default-features
+    time cargo check $@ --manifest-path util/io/Cargo.toml --no-default-features
+    time cargo check $@ --manifest-path util/io/Cargo.toml --features "mio"
+
+    # Validate chainspecs
+    echo "________Validate chainspecs________"
+    time ./scripts/validate_chainspecs.sh
+  else
+    echo "# not validating due to \$VALIDATE!=1"
+  fi
+}
+
+cpp_test () {
+  case $CARGO_TARGET in
+    (x86_64-unknown-linux-gnu)
+      # Running the C++ example
+      echo "________Running the C++ example________"
+      cd parity-clib-examples/cpp && \
+        mkdir -p build && \
+        cd build && \
+        cmake .. && \
+        make -j $THREADS && \
+        ./parity-example && \
+        cd .. && \
+        rm -rf build && \
+        cd ../..
+      ;;
+    (*)
+      echo "________Skipping the C++ example________"
+      ;;
+  esac
+}
+
+cargo_test () {
+  echo "________Running Parity Full Test Suite________"
+  git submodule update --init --recursive
+  time cargo test $OPTIONS --features "$FEATURES" --all $@ -- --test-threads $THREADS
+}
+
+
+if [ "$CARGO_TARGET" ]
+then
+  validate --target $CARGO_TARGET
+else
+  validate
+fi
+
+test "${RUN_TESTS}" = "all" && cpp_test
+
+if [ "$CARGO_TARGET" ]
+then
+
+  case "${RUN_TESTS}" in
+    (cargo|all)
+      cargo_test --target $CARGO_TARGET $@
+      ;;
+    ('')
+      cargo_test --no-run --target $CARGO_TARGET $@
+      ;;
+  esac
+else
+  cargo_test $@
 fi
 
-# Running the C++ example
-echo "________Running the C++ example________"
-cd parity-clib-examples/cpp && \
-  mkdir -p build && \
-  cd build && \
-  cmake .. && \
-  make -j 8 && \
-  ./parity-example && \
-  cd .. && \
-  rm -rf build && \
-  cd ../..
-
-# Running tests
-echo "________Running Parity Full Test Suite________"
-git submodule update --init --recursive
-time cargo test  $OPTIONS --features "$FEATURES" --all $1 -- --test-threads 8
diff --git a/util/io/Cargo.toml b/util/io/Cargo.toml
index ad50881ddfa..e53b302b7fe 100644
--- a/util/io/Cargo.toml
+++ b/util/io/Cargo.toml
@@ -9,7 +9,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 [dependencies]
 fnv = "1.0"
 mio = { version = "0.6.8", optional = true }
-crossbeam = "0.3"
+crossbeam-deque = "0.6"
 parking_lot = "0.6"
 log = "0.4"
 slab = "0.4"
diff --git a/util/io/src/lib.rs b/util/io/src/lib.rs
index 02dbf223be4..3aa51fbdf9d 100644
--- a/util/io/src/lib.rs
+++ b/util/io/src/lib.rs
@@ -74,7 +74,7 @@ extern crate mio;
 #[macro_use]
 extern crate log as rlog;
 extern crate slab;
-extern crate crossbeam;
+extern crate crossbeam_deque as deque;
 extern crate parking_lot;
 extern crate num_cpus;
 extern crate timer;
diff --git a/util/io/src/service_mio.rs b/util/io/src/service_mio.rs
index 729fcec176e..07d0f8106bb 100644
--- a/util/io/src/service_mio.rs
+++ b/util/io/src/service_mio.rs
@@ -20,7 +20,7 @@ use std::collections::HashMap;
 use mio::*;
 use mio::timer::{Timeout};
 use mio::deprecated::{EventLoop, Handler, Sender, EventLoopBuilder};
-use crossbeam::sync::chase_lev;
+use deque;
 use slab::Slab;
 use {IoError, IoHandler};
 use worker::{Worker, Work, WorkType};
@@ -184,7 +184,7 @@ pub struct IoManager<Message> where Message: Send + Sync {
 	timers: Arc<RwLock<HashMap<HandlerId, UserTimer>>>,
 	handlers: Arc<RwLock<Slab<Arc<IoHandler<Message>>>>>,
 	workers: Vec<Worker>,
-	worker_channel: chase_lev::Worker<Work<Message>>,
+	worker_channel: deque::Worker<Work<Message>>,
 	work_ready: Arc<Condvar>,
 }
 
@@ -194,7 +194,7 @@ impl<Message> IoManager<Message> where Message: Send + Sync + 'static {
 		event_loop: &mut EventLoop<IoManager<Message>>,
 		handlers: Arc<RwLock<Slab<Arc<IoHandler<Message>>>>>
 	) -> Result<(), IoError> {
-		let (worker, stealer) = chase_lev::deque();
+		let (worker, stealer) = deque::fifo();
 		let num_workers = 4;
 		let work_ready_mutex =  Arc::new(Mutex::new(()));
 		let work_ready = Arc::new(Condvar::new());
@@ -430,7 +430,7 @@ impl<Message> IoChannel<Message> where Message: Send + Sync + 'static {
 /// General IO Service. Starts an event loop and dispatches IO requests.
 /// 'Message' is a notification message type
 pub struct IoService<Message> where Message: Send + Sync + 'static {
-	thread: Mutex<Option<JoinHandle<()>>>,
+	thread: Option<JoinHandle<()>>,
 	host_channel: Mutex<Sender<IoMessage<Message>>>,
 	handlers: Arc<RwLock<Slab<Arc<IoHandler<Message>>>>>,
 }
@@ -448,19 +448,19 @@ impl<Message> IoService<Message> where Message: Send + Sync + 'static {
 			IoManager::<Message>::start(&mut event_loop, h).expect("Error starting IO service");
 		});
 		Ok(IoService {
-			thread: Mutex::new(Some(thread)),
+			thread: Some(thread),
 			host_channel: Mutex::new(channel),
 			handlers: handlers,
 		})
 	}
 
-	pub fn stop(&self) {
+	pub fn stop(&mut self) {
 		trace!(target: "shutdown", "[IoService] Closing...");
 		// Clear handlers so that shared pointers are not stuck on stack
 		// in Channel::send_sync
 		self.handlers.write().clear();
 		self.host_channel.lock().send(IoMessage::Shutdown).unwrap_or_else(|e| warn!("Error on IO service shutdown: {:?}", e));
-		if let Some(thread) = self.thread.lock().take() {
+		if let Some(thread) = self.thread.take() {
 			thread.join().unwrap_or_else(|e| {
 				debug!(target: "shutdown", "Error joining IO service event loop thread: {:?}", e);
 			});
diff --git a/util/io/src/service_non_mio.rs b/util/io/src/service_non_mio.rs
index 315f84c4d1d..30839f9e954 100644
--- a/util/io/src/service_non_mio.rs
+++ b/util/io/src/service_non_mio.rs
@@ -16,7 +16,7 @@
 
 use std::sync::{Arc, Weak};
 use std::thread;
-use crossbeam::sync::chase_lev;
+use deque;
 use slab::Slab;
 use fnv::FnvHashMap;
 use {IoError, IoHandler};
@@ -198,7 +198,7 @@ struct Shared<Message> where Message: Send + Sync + 'static {
 	// necessary.
 	timers: Mutex<FnvHashMap<TimerToken, TimerGuard>>,
 	// Channel used to send work to the worker threads.
-	channel: Mutex<Option<chase_lev::Worker<WorkTask<Message>>>>,
+	channel: Mutex<Option<deque::Worker<WorkTask<Message>>>>,
 }
 
 // Messages used to communicate with the event loop from other threads.
@@ -224,7 +224,7 @@ impl<Message> Clone for WorkTask<Message> where Message: Send + Sized {
 impl<Message> IoService<Message> where Message: Send + Sync + 'static {
 	/// Starts IO event loop
 	pub fn start() -> Result<IoService<Message>, IoError> {
-		let (tx, rx) = chase_lev::deque();
+		let (tx, rx) = deque::fifo();
 
 		let shared = Arc::new(Shared {
 			handlers: RwLock::new(Slab::with_capacity(MAX_HANDLERS)),
@@ -251,7 +251,7 @@ impl<Message> IoService<Message> where Message: Send + Sync + 'static {
 	}
 
 	/// Stops the IO service.
-	pub fn stop(&self) {
+	pub fn stop(&mut self) {
 		trace!(target: "shutdown", "[IoService] Closing...");
 		// Clear handlers so that shared pointers are not stuck on stack
 		// in Channel::send_sync
@@ -307,15 +307,15 @@ impl<Message> Drop for IoService<Message> where Message: Send + Sync {
 	}
 }
 
-fn do_work<Message>(shared: &Arc<Shared<Message>>, rx: chase_lev::Stealer<WorkTask<Message>>)
-	where Message: Send + Sync + 'static 
+fn do_work<Message>(shared: &Arc<Shared<Message>>, rx: deque::Stealer<WorkTask<Message>>)
+	where Message: Send + Sync + 'static
 {
 	loop {
 		match rx.steal() {
-			chase_lev::Steal::Abort => continue,
-			chase_lev::Steal::Empty => thread::park(),
-			chase_lev::Steal::Data(WorkTask::Shutdown) => break,
-			chase_lev::Steal::Data(WorkTask::UserMessage(message)) => {
+			deque::Steal::Retry => continue,
+			deque::Steal::Empty => thread::park(),
+			deque::Steal::Data(WorkTask::Shutdown) => break,
+			deque::Steal::Data(WorkTask::UserMessage(message)) => {
 				for id in 0 .. MAX_HANDLERS {
 					if let Some(handler) = shared.handlers.read().get(id) {
 						let ctxt = IoContext { handler: id, shared: shared.clone() };
@@ -323,7 +323,7 @@ fn do_work<Message>(shared: &Arc<Shared<Message>>, rx: chase_lev::Stealer<WorkTa
 					}
 				}
 			},
-			chase_lev::Steal::Data(WorkTask::TimerTrigger { handler_id, token }) => {
+			deque::Steal::Data(WorkTask::TimerTrigger { handler_id, token }) => {
 				if let Some(handler) = shared.handlers.read().get(handler_id) {
 					let ctxt = IoContext { handler: handler_id, shared: shared.clone() };
 					handler.timeout(&ctxt, token);
diff --git a/util/io/src/worker.rs b/util/io/src/worker.rs
index 2520608483d..1d335941677 100644
--- a/util/io/src/worker.rs
+++ b/util/io/src/worker.rs
@@ -17,7 +17,7 @@
 use std::sync::Arc;
 use std::thread::{JoinHandle, self};
 use std::sync::atomic::{AtomicBool, Ordering as AtomicOrdering};
-use crossbeam::sync::chase_lev;
+use deque;
 use service_mio::{HandlerId, IoChannel, IoContext};
 use IoHandler;
 use LOCAL_STACK_SIZE;
@@ -53,7 +53,7 @@ pub struct Worker {
 impl Worker {
 	/// Creates a new worker instance.
 	pub fn new<Message>(index: usize,
-						stealer: chase_lev::Stealer<Work<Message>>,
+						stealer: deque::Stealer<Work<Message>>,
 						channel: IoChannel<Message>,
 						wait: Arc<Condvar>,
 						wait_mutex: Arc<Mutex<()>>,
@@ -75,8 +75,9 @@ impl Worker {
 		worker
 	}
 
-	fn work_loop<Message>(stealer: chase_lev::Stealer<Work<Message>>,
-						channel: IoChannel<Message>, wait: Arc<Condvar>,
+	fn work_loop<Message>(stealer: deque::Stealer<Work<Message>>,
+						channel: IoChannel<Message>,
+						wait: Arc<Condvar>,
 						wait_mutex: Arc<Mutex<()>>,
 						deleting: Arc<AtomicBool>)
 						where Message: Send + Sync + 'static {
@@ -91,8 +92,9 @@ impl Worker {
 
 			while !deleting.load(AtomicOrdering::Acquire) {
 				match stealer.steal() {
-					chase_lev::Steal::Data(work) => Worker::do_work(work, channel.clone()),
-					_ => break,
+					deque::Steal::Data(work) => Worker::do_work(work, channel.clone()),
+					deque::Steal::Retry => {},
+					deque::Steal::Empty => break,
 				}
 			}
 		}
diff --git a/util/network-devp2p/src/discovery.rs b/util/network-devp2p/src/discovery.rs
index c7782b247ca..8ef244cbd11 100644
--- a/util/network-devp2p/src/discovery.rs
+++ b/util/network-devp2p/src/discovery.rs
@@ -42,9 +42,9 @@ const PACKET_PONG: u8 = 2;
 const PACKET_FIND_NODE: u8 = 3;
 const PACKET_NEIGHBOURS: u8 = 4;
 
-const PING_TIMEOUT: Duration = Duration::from_millis(300);
+const PING_TIMEOUT: Duration = Duration::from_millis(500);
 const FIND_NODE_TIMEOUT: Duration = Duration::from_secs(2);
-const EXPIRY_TIME: Duration = Duration::from_secs(60);
+const EXPIRY_TIME: Duration = Duration::from_secs(20);
 const MAX_NODES_PING: usize = 32; // Max nodes to add/ping at once
 const REQUEST_BACKOFF: [Duration; 4] = [
 	Duration::from_secs(1),
@@ -80,15 +80,29 @@ impl BucketEntry {
 	}
 }
 
-pub struct NodeBucket {
-	nodes: VecDeque<BucketEntry>, //sorted by last active
+struct FindNodeRequest {
+	// Time when the request was sent
+	sent_at: Instant,
+	// Number of items sent by the node
+	response_count: usize,
+	// Whether the request have been answered yet
+	answered: bool,
 }
 
-struct PendingRequest {
-	packet_id: u8,
+struct PingRequest {
+	// Time when the request was sent
 	sent_at: Instant,
-	packet_hash: H256,
-	response_count: usize, // Some requests (eg. FIND_NODE) have multi-packet responses
+	// The node to which the request was sent
+	node: NodeEntry,
+	// The hash sent in the Ping request
+	echo_hash: H256,
+	// The hash Parity used to respond with (until rev 01f825b0e1f1c4c420197b51fc801cbe89284b29)
+	#[deprecated()]
+	deprecated_echo_hash: H256,
+}
+
+pub struct NodeBucket {
+	nodes: VecDeque<BucketEntry>, //sorted by last active
 }
 
 impl Default for NodeBucket {
@@ -115,13 +129,13 @@ pub struct Discovery<'a> {
 	id_hash: H256,
 	secret: Secret,
 	public_endpoint: NodeEndpoint,
-	discovery_round: u16,
+	discovery_initiated: bool,
+	discovery_round: Option<u16>,
 	discovery_id: NodeId,
 	discovery_nodes: HashSet<NodeId>,
 	node_buckets: Vec<NodeBucket>,
-	in_flight_requests: HashMap<NodeId, PendingRequest>,
-	expiring_pings: VecDeque<(NodeId, Instant)>,
-	expiring_finds: VecDeque<(NodeId, Instant)>,
+	in_flight_pings: HashMap<NodeId, PingRequest>,
+	in_flight_find_nodes: HashMap<NodeId, FindNodeRequest>,
 	send_queue: VecDeque<Datagram>,
 	check_timestamps: bool,
 	adding_nodes: Vec<NodeEntry>,
@@ -141,13 +155,13 @@ impl<'a> Discovery<'a> {
 			id_hash: keccak(key.public()),
 			secret: key.secret().clone(),
 			public_endpoint: public,
-			discovery_round: 0,
+			discovery_initiated: false,
+			discovery_round: None,
 			discovery_id: NodeId::new(),
 			discovery_nodes: HashSet::new(),
 			node_buckets: (0..ADDRESS_BITS).map(|_| NodeBucket::new()).collect(),
-			in_flight_requests: HashMap::new(),
-			expiring_pings: VecDeque::new(),
-			expiring_finds: VecDeque::new(),
+			in_flight_pings: HashMap::new(),
+			in_flight_find_nodes: HashMap::new(),
 			send_queue: VecDeque::new(),
 			check_timestamps: true,
 			adding_nodes: Vec::new(),
@@ -175,15 +189,6 @@ impl<'a> Discovery<'a> {
 		}
 	}
 
-	/// Add a list of known nodes to the table.
-	pub fn init_node_list(&mut self, nodes: Vec<NodeEntry>) {
-		for n in nodes {
-			if self.is_allowed(&n) {
-				self.update_node(n);
-			}
-		}
-	}
-
 	fn update_node(&mut self, e: NodeEntry) -> Option<TableUpdates> {
 		trace!(target: "discovery", "Inserting {:?}", &e);
 		let id_hash = keccak(e.id);
@@ -224,13 +229,20 @@ impl<'a> Discovery<'a> {
 	/// Starts the discovery process at round 0
 	fn start(&mut self) {
 		trace!(target: "discovery", "Starting discovery");
-		self.discovery_round = 0;
+		self.discovery_round = Some(0);
 		self.discovery_id.randomize(); //TODO: use cryptographic nonce
 		self.discovery_nodes.clear();
 	}
 
+	/// Complete the discovery process
+	fn stop(&mut self) {
+		trace!(target: "discovery", "Completing discovery");
+		self.discovery_round = None;
+		self.discovery_nodes.clear();
+	}
+
 	fn update_new_nodes(&mut self) {
-		while self.in_flight_requests.len() < MAX_NODES_PING {
+		while self.in_flight_pings.len() < MAX_NODES_PING {
 			match self.adding_nodes.pop() {
 				Some(next) => self.try_ping(next),
 				None => break,
@@ -239,8 +251,12 @@ impl<'a> Discovery<'a> {
 	}
 
 	fn discover(&mut self) {
-		self.update_new_nodes();
-		if self.discovery_round == DISCOVERY_MAX_STEPS {
+		let discovery_round = match self.discovery_round {
+			Some(r) => r,
+			None => return,
+		};
+		if discovery_round == DISCOVERY_MAX_STEPS {
+			self.stop();
 			return;
 		}
 		trace!(target: "discovery", "Starting round {:?}", self.discovery_round);
@@ -263,12 +279,10 @@ impl<'a> Discovery<'a> {
 		}
 
 		if tried_count == 0 {
-			trace!(target: "discovery", "Completing discovery");
-			self.discovery_round = DISCOVERY_MAX_STEPS;
-			self.discovery_nodes.clear();
+			self.stop();
 			return;
 		}
-		self.discovery_round += 1;
+		self.discovery_round = Some(discovery_round + 1);
 	}
 
 	/// The base 2 log of the distance between a and b using the XOR metric.
@@ -285,14 +299,20 @@ impl<'a> Discovery<'a> {
 	}
 
 	fn try_ping(&mut self, node: NodeEntry) {
-		if !self.is_allowed(&node) ||
-			self.in_flight_requests.contains_key(&node.id) ||
-			self.adding_nodes.iter().any(|n| n.id == node.id)
-		{
+		if !self.is_allowed(&node) {
+			trace!(target: "discovery", "Node {:?} not allowed", node);
+			return;
+		}
+		if self.in_flight_pings.contains_key(&node.id) || self.in_flight_find_nodes.contains_key(&node.id) {
+			trace!(target: "discovery", "Node {:?} in flight requests", node);
+			return;
+		}
+		if self.adding_nodes.iter().any(|n| n.id == node.id) {
+			trace!(target: "discovery", "Node {:?} in adding nodes", node);
 			return;
 		}
 
-		if self.in_flight_requests.len() < MAX_NODES_PING {
+		if self.in_flight_pings.len() < MAX_NODES_PING {
 			self.ping(&node)
 				.unwrap_or_else(|e| {
 					warn!(target: "discovery", "Error sending Ping packet: {:?}", e);
@@ -308,18 +328,17 @@ impl<'a> Discovery<'a> {
 		self.public_endpoint.to_rlp_list(&mut rlp);
 		node.endpoint.to_rlp_list(&mut rlp);
 		append_expiration(&mut rlp);
+		let old_parity_hash = keccak(rlp.as_raw());
 		let hash = self.send_packet(PACKET_PING, &node.endpoint.udp_address(), &rlp.drain())?;
 
-		let request_info = PendingRequest {
-			packet_id: PACKET_PING,
+		self.in_flight_pings.insert(node.id, PingRequest {
 			sent_at: Instant::now(),
-			packet_hash: hash,
-			response_count: 0,
-		};
-		self.expiring_pings.push_back((node.id, request_info.sent_at));
-		self.in_flight_requests.insert(node.id, request_info);
+			node: node.clone(),
+			echo_hash: hash,
+			deprecated_echo_hash: old_parity_hash,
+		});
 
-		trace!(target: "discovery", "Sent Ping to {:?}", &node.endpoint);
+		trace!(target: "discovery", "Sent Ping to {:?} ; node_id={:#x}", &node.endpoint, node.id);
 		Ok(())
 	}
 
@@ -327,16 +346,13 @@ impl<'a> Discovery<'a> {
 		let mut rlp = RlpStream::new_list(2);
 		rlp.append(target);
 		append_expiration(&mut rlp);
-		let hash = self.send_packet(PACKET_FIND_NODE, &node.endpoint.udp_address(), &rlp.drain())?;
+		self.send_packet(PACKET_FIND_NODE, &node.endpoint.udp_address(), &rlp.drain())?;
 
-		let request_info = PendingRequest {
-			packet_id: PACKET_FIND_NODE,
+		self.in_flight_find_nodes.insert(node.id, FindNodeRequest {
 			sent_at: Instant::now(),
-			packet_hash: hash,
 			response_count: 0,
-		};
-		self.expiring_finds.push_back((node.id, request_info.sent_at));
-		self.in_flight_requests.insert(node.id, request_info);
+			answered: false,
+		});
 
 		trace!(target: "discovery", "Sent FindNode to {:?}", &node.endpoint);
 		Ok(())
@@ -448,20 +464,31 @@ impl<'a> Discovery<'a> {
 		entry.endpoint.is_allowed(&self.ip_filter) && entry.id != self.id
 	}
 
-	fn on_ping(&mut self, rlp: &Rlp, node: &NodeId, from: &SocketAddr, echo_hash: &[u8]) -> Result<Option<TableUpdates>, Error> {
+	fn on_ping(&mut self, rlp: &Rlp, node_id: &NodeId, from: &SocketAddr, echo_hash: &[u8]) -> Result<Option<TableUpdates>, Error> {
 		trace!(target: "discovery", "Got Ping from {:?}", &from);
-		let source = NodeEndpoint::from_rlp(&rlp.at(1)?)?;
-		let dest = NodeEndpoint::from_rlp(&rlp.at(2)?)?;
+		let ping_from = NodeEndpoint::from_rlp(&rlp.at(1)?)?;
+		let ping_to = NodeEndpoint::from_rlp(&rlp.at(2)?)?;
 		let timestamp: u64 = rlp.val_at(3)?;
 		self.check_timestamp(timestamp)?;
 
 		let mut response = RlpStream::new_list(3);
-		dest.to_rlp_list(&mut response);
+		let pong_to = NodeEndpoint {
+			address: from.clone(),
+			udp_port: ping_from.udp_port
+		};
+		// Here the PONG's `To` field should be the node we are
+		// sending the request to
+		// WARNING: this field _should not be used_, but old Parity versions
+		// use it in order to get the node's address.
+		// So this is a temporary fix so that older Parity versions don't brake completely.
+		ping_to.to_rlp_list(&mut response);
+		// pong_to.to_rlp_list(&mut response);
+
 		response.append(&echo_hash);
 		append_expiration(&mut response);
 		self.send_packet(PACKET_PONG, from, &response.drain())?;
 
-		let entry = NodeEntry { id: *node, endpoint: source.clone() };
+		let entry = NodeEntry { id: *node_id, endpoint: pong_to.clone() };
 		if !entry.endpoint.is_valid() {
 			debug!(target: "discovery", "Got bad address: {:?}", entry);
 		} else if !self.is_allowed(&entry) {
@@ -469,40 +496,45 @@ impl<'a> Discovery<'a> {
 		} else {
 			self.add_node(entry.clone());
 		}
-
 		Ok(None)
 	}
 
 	fn on_pong(&mut self, rlp: &Rlp, node_id: &NodeId, from: &SocketAddr) -> Result<Option<TableUpdates>, Error> {
-		trace!(target: "discovery", "Got Pong from {:?}", &from);
-		let dest = NodeEndpoint::from_rlp(&rlp.at(0)?)?;
+		trace!(target: "discovery", "Got Pong from {:?} ; node_id={:#x}", &from, node_id);
+		let _pong_to = NodeEndpoint::from_rlp(&rlp.at(0)?)?;
 		let echo_hash: H256 = rlp.val_at(1)?;
 		let timestamp: u64 = rlp.val_at(2)?;
 		self.check_timestamp(timestamp)?;
-		let mut node = NodeEntry { id: *node_id, endpoint: dest };
-		if !node.endpoint.is_valid() {
-			debug!(target: "discovery", "Bad address: {:?}", node);
-			node.endpoint.address = *from;
-		}
 
-		let is_expected = match self.in_flight_requests.entry(*node_id) {
+		let expected_node = match self.in_flight_pings.entry(*node_id) {
 			Entry::Occupied(entry) => {
-				let is_expected = {
+				let expected_node = {
 					let request = entry.get();
-					request.packet_id == PACKET_PING && request.packet_hash == echo_hash
+					if request.echo_hash != echo_hash && request.deprecated_echo_hash != echo_hash {
+						debug!(target: "discovery", "Got unexpected Pong from {:?} ; packet_hash={:#x} ; expected_hash={:#x}", &from, request.echo_hash, echo_hash);
+						None
+					} else {
+						if request.deprecated_echo_hash == echo_hash {
+							trace!(target: "discovery", "Got Pong from an old parity-ethereum version.");
+						}
+						Some(request.node.clone())
+					}
 				};
-				if is_expected {
+
+				if expected_node.is_some() {
 					entry.remove();
 				}
-				is_expected
+				expected_node
+			},
+			Entry::Vacant(_) => {
+				None
 			},
-			Entry::Vacant(_) => false
 		};
 
-		if is_expected {
+		if let Some(node) = expected_node {
 			Ok(self.update_node(node))
 		} else {
-			debug!(target: "discovery", "Got unexpected Pong from {:?}", &from);
+			debug!(target: "discovery", "Got unexpected Pong from {:?} ; request not found", &from);
 			Ok(None)
 		}
 	}
@@ -544,29 +576,32 @@ impl<'a> Discovery<'a> {
 	fn on_neighbours(&mut self, rlp: &Rlp, node_id: &NodeId, from: &SocketAddr) -> Result<Option<TableUpdates>, Error> {
 		let results_count = rlp.at(0)?.item_count()?;
 
-		let is_expected = match self.in_flight_requests.entry(*node_id) {
+		let is_expected = match self.in_flight_find_nodes.entry(*node_id) {
 			Entry::Occupied(mut entry) => {
-				let result = {
+				let expected = {
 					let request = entry.get_mut();
-					if request.packet_id == PACKET_FIND_NODE &&
-						request.response_count + results_count <= BUCKET_SIZE
-					{
+					// Mark the request as answered
+					request.answered = true;
+					if request.response_count + results_count <= BUCKET_SIZE {
 						request.response_count += results_count;
 						true
 					} else {
+						debug!(target: "discovery", "Got unexpected Neighbors from {:?} ; oversized packet ({} + {}) node_id={:#x}", &from, request.response_count, results_count, node_id);
 						false
 					}
 				};
 				if entry.get().response_count == BUCKET_SIZE {
 					entry.remove();
 				}
-				result
+				expected
 			}
-			Entry::Vacant(_) => false,
+			Entry::Vacant(_) => {
+				debug!(target: "discovery", "Got unexpected Neighbors from {:?} ; couldn't find node_id={:#x}", &from, node_id);
+				false
+			},
 		};
 
 		if !is_expected {
-			debug!(target: "discovery", "Got unexpected Neighbors from {:?}", &from);
 			return Ok(None);
 		}
 
@@ -591,65 +626,74 @@ impl<'a> Discovery<'a> {
 		Ok(None)
 	}
 
-	fn check_expired(&mut self, time: Instant) -> HashSet<NodeId> {
-		let mut removed: HashSet<NodeId> = HashSet::new();
-		while let Some((node_id, sent_at)) = self.expiring_pings.pop_front() {
-			if time.duration_since(sent_at) <= PING_TIMEOUT {
-				self.expiring_pings.push_front((node_id, sent_at));
-				break;
+	fn check_expired(&mut self, time: Instant) {
+		let mut nodes_to_expire = Vec::new();
+		self.in_flight_pings.retain(|node_id, ping_request| {
+			if time.duration_since(ping_request.sent_at) > PING_TIMEOUT {
+				debug!(target: "discovery", "Removing expired PING request for node_id={:#x}", node_id);
+				nodes_to_expire.push(*node_id);
+				false
+			} else {
+				true
 			}
-			self.expire_in_flight_request(node_id, sent_at, &mut removed);
-		}
-		while let Some((node_id, sent_at)) = self.expiring_finds.pop_front() {
-			if time.duration_since(sent_at) <= FIND_NODE_TIMEOUT {
-				self.expiring_finds.push_front((node_id, sent_at));
-				break;
+		});
+		self.in_flight_find_nodes.retain(|node_id, find_node_request| {
+			if time.duration_since(find_node_request.sent_at) > FIND_NODE_TIMEOUT {
+				if !find_node_request.answered {
+					debug!(target: "discovery", "Removing expired FIND NODE request for node_id={:#x}", node_id);
+					nodes_to_expire.push(*node_id);
+				}
+				false
+			} else {
+				true
 			}
-			self.expire_in_flight_request(node_id, sent_at, &mut removed);
+		});
+		for node_id in nodes_to_expire {
+			self.expire_node_request(node_id);
 		}
-		removed
 	}
 
-	fn expire_in_flight_request(&mut self, node_id: NodeId, sent_at: Instant, removed: &mut HashSet<NodeId>) {
-		if let Entry::Occupied(entry) = self.in_flight_requests.entry(node_id) {
-			if entry.get().sent_at == sent_at {
-				entry.remove();
-
-				// Attempt to remove from bucket if in one.
-				let id_hash = keccak(&node_id);
-				let dist = Discovery::distance(&self.id_hash, &id_hash)
-					.expect("distance is None only if id hashes are equal; will never send request to self; qed");
-				let bucket = &mut self.node_buckets[dist];
-				if let Some(index) = bucket.nodes.iter().position(|n| n.id_hash == id_hash) {
-					if bucket.nodes[index].fail_count < self.request_backoff.len() {
-						let node = &mut bucket.nodes[index];
-						node.backoff_until = Instant::now() + self.request_backoff[node.fail_count];
-						node.fail_count += 1;
-						trace!(
-							target: "discovery",
-							"Requests to node {:?} timed out {} consecutive time(s)",
-							&node.address, node.fail_count
-						);
-					} else {
-						removed.insert(node_id);
-						let node = bucket.nodes.remove(index).expect("index was located in if condition");
-						debug!(target: "discovery", "Removed expired node {:?}", &node.address);
-					}
-				}
+	fn expire_node_request(&mut self, node_id: NodeId) {
+		// Attempt to remove from bucket if in one.
+		let id_hash = keccak(&node_id);
+		let dist = Discovery::distance(&self.id_hash, &id_hash)
+			.expect("distance is None only if id hashes are equal; will never send request to self; qed");
+		let bucket = &mut self.node_buckets[dist];
+		if let Some(index) = bucket.nodes.iter().position(|n| n.id_hash == id_hash) {
+			if bucket.nodes[index].fail_count < self.request_backoff.len() {
+				let node = &mut bucket.nodes[index];
+				node.backoff_until = Instant::now() + self.request_backoff[node.fail_count];
+				node.fail_count += 1;
+				trace!(
+					target: "discovery",
+					"Requests to node {:?} timed out {} consecutive time(s)",
+					&node.address, node.fail_count
+				);
+			} else {
+				let node = bucket.nodes.remove(index).expect("index was located in if condition");
+				debug!(target: "discovery", "Removed expired node {:?}", &node.address);
 			}
 		}
 	}
 
-	pub fn round(&mut self) -> Option<TableUpdates> {
-		let removed = self.check_expired(Instant::now());
-		self.discover();
-		if !removed.is_empty() {
-			Some(TableUpdates { added: HashMap::new(), removed })
-		} else { None }
+
+	pub fn round(&mut self) {
+		self.check_expired(Instant::now());
+		self.update_new_nodes();
+
+		if self.discovery_round.is_some() {
+			self.discover();
+		// Start discovering if the first pings have been sent (or timed out)
+		} else if self.in_flight_pings.len() == 0 && !self.discovery_initiated {
+			self.discovery_initiated = true;
+			self.refresh();
+		}
 	}
 
 	pub fn refresh(&mut self) {
-		self.start();
+		if self.discovery_round.is_none() {
+			self.start();
+		}
 	}
 
 	pub fn any_sends_queued(&self) -> bool {
@@ -663,6 +707,16 @@ impl<'a> Discovery<'a> {
 	pub fn requeue_send(&mut self, datagram: Datagram) {
 		self.send_queue.push_front(datagram)
 	}
+
+	/// Add a list of known nodes to the table.
+	#[cfg(test)]
+	pub fn init_node_list(&mut self, nodes: Vec<NodeEntry>) {
+		for n in nodes {
+			if self.is_allowed(&n) {
+				self.update_node(n);
+			}
+		}
+	}
 }
 
 fn append_expiration(rlp: &mut RlpStream) {
@@ -738,13 +792,13 @@ mod tests {
 
 		for i in 1..(MAX_NODES_PING+1) {
 			discovery.add_node(NodeEntry { id: NodeId::random(), endpoint: ep.clone() });
-			assert_eq!(discovery.in_flight_requests.len(), i);
+			assert_eq!(discovery.in_flight_pings.len(), i);
 			assert_eq!(discovery.send_queue.len(), i);
 			assert_eq!(discovery.adding_nodes.len(), 0);
 		}
 		for i in 1..20 {
 			discovery.add_node(NodeEntry { id: NodeId::random(), endpoint: ep.clone() });
-			assert_eq!(discovery.in_flight_requests.len(), MAX_NODES_PING);
+			assert_eq!(discovery.in_flight_pings.len(), MAX_NODES_PING);
 			assert_eq!(discovery.send_queue.len(), MAX_NODES_PING);
 			assert_eq!(discovery.adding_nodes.len(), i);
 		}
@@ -821,23 +875,29 @@ mod tests {
 		assert_eq!(total_bucket_nodes(&discovery.node_buckets), 1200);
 
 		// Requests have not expired yet.
-		let removed = discovery.check_expired(Instant::now()).len();
+		let num_nodes = total_bucket_nodes(&discovery.node_buckets);
+		discovery.check_expired(Instant::now());
+		let removed = num_nodes - total_bucket_nodes(&discovery.node_buckets);
 		assert_eq!(removed, 0);
 
 		// Expiring pings to bucket nodes removes them from bucket.
-		let removed = discovery.check_expired(Instant::now() + PING_TIMEOUT).len();
+		let num_nodes = total_bucket_nodes(&discovery.node_buckets);
+		discovery.check_expired(Instant::now() + PING_TIMEOUT);
+		let removed = num_nodes - total_bucket_nodes(&discovery.node_buckets);
 		assert!(removed > 0);
 		assert_eq!(total_bucket_nodes(&discovery.node_buckets), 1200 - removed);
 
 		for _ in 0..100 {
 			discovery.add_node(NodeEntry { id: NodeId::random(), endpoint: ep.clone() });
 		}
-		assert!(discovery.in_flight_requests.len() > 0);
+		assert!(discovery.in_flight_pings.len() > 0);
 
 		// Expire pings to nodes that are not in buckets.
-		let removed = discovery.check_expired(Instant::now() + PING_TIMEOUT).len();
+		let num_nodes = total_bucket_nodes(&discovery.node_buckets);
+		discovery.check_expired(Instant::now() + PING_TIMEOUT);
+		let removed = num_nodes - total_bucket_nodes(&discovery.node_buckets);
 		assert_eq!(removed, 0);
-		assert_eq!(discovery.in_flight_requests.len(), 0);
+		assert_eq!(discovery.in_flight_pings.len(), 0);
 
 		let from = SocketAddr::from_str("99.99.99.99:40445").unwrap();
 
@@ -849,7 +909,9 @@ mod tests {
 			discovery.on_packet(&packet, from.clone()).unwrap();
 		}
 
-		let removed = discovery.check_expired(Instant::now() + FIND_NODE_TIMEOUT).len();
+		let num_nodes = total_bucket_nodes(&discovery.node_buckets);
+		discovery.check_expired(Instant::now() + FIND_NODE_TIMEOUT);
+		let removed = num_nodes - total_bucket_nodes(&discovery.node_buckets);
 		assert!(removed > 0);
 
 		// FIND_NODE does not time out because it receives k results.
@@ -859,7 +921,9 @@ mod tests {
 			discovery.on_packet(&packet, from.clone()).unwrap();
 		}
 
-		let removed = discovery.check_expired(Instant::now() + FIND_NODE_TIMEOUT).len();
+		let num_nodes = total_bucket_nodes(&discovery.node_buckets);
+		discovery.check_expired(Instant::now() + FIND_NODE_TIMEOUT);
+		let removed = num_nodes - total_bucket_nodes(&discovery.node_buckets);
 		assert_eq!(removed, 0);
 
 		// Test bucket evictions with retries.
@@ -868,12 +932,16 @@ mod tests {
 
 		for _ in 0..2 {
 			discovery.ping(&node_entries[101]).unwrap();
-			let removed = discovery.check_expired(Instant::now() + PING_TIMEOUT).len();
+			let num_nodes = total_bucket_nodes(&discovery.node_buckets);
+			discovery.check_expired(Instant::now() + PING_TIMEOUT);
+			let removed = num_nodes - total_bucket_nodes(&discovery.node_buckets);
 			assert_eq!(removed, 0);
 		}
 
 		discovery.ping(&node_entries[101]).unwrap();
-		let removed = discovery.check_expired(Instant::now() + PING_TIMEOUT).len();
+		let num_nodes = total_bucket_nodes(&discovery.node_buckets);
+		discovery.check_expired(Instant::now() + PING_TIMEOUT);
+		let removed = num_nodes - total_bucket_nodes(&discovery.node_buckets);
 		assert_eq!(removed, 1);
 	}
 
@@ -1066,9 +1134,11 @@ mod tests {
 		assert_eq!(ep1, NodeEndpoint::from_rlp(&rlp.at(1).unwrap()).unwrap());
 		assert_eq!(ep2, NodeEndpoint::from_rlp(&rlp.at(2).unwrap()).unwrap());
 
+		// `discovery1` should be added to node table on ping received
 		if let Some(_) = discovery2.on_packet(&ping_data.payload, ep1.address.clone()).unwrap() {
 			panic!("Expected no changes to discovery2's table");
 		}
+
 		let pong_data = discovery2.dequeue_send().unwrap();
 		let data = &pong_data.payload[(32 + 65)..];
 		assert_eq!(data[0], PACKET_PONG);
diff --git a/util/network-devp2p/src/host.rs b/util/network-devp2p/src/host.rs
index f16701b6a8b..8df7a89a36f 100644
--- a/util/network-devp2p/src/host.rs
+++ b/util/network-devp2p/src/host.rs
@@ -59,8 +59,9 @@ const TCP_ACCEPT: StreamToken = SYS_TIMER + 1;
 const IDLE: TimerToken = SYS_TIMER + 2;
 const DISCOVERY: StreamToken = SYS_TIMER + 3;
 const DISCOVERY_REFRESH: TimerToken = SYS_TIMER + 4;
-const DISCOVERY_ROUND: TimerToken = SYS_TIMER + 5;
-const NODE_TABLE: TimerToken = SYS_TIMER + 6;
+const FAST_DISCOVERY_REFRESH: TimerToken = SYS_TIMER + 5;
+const DISCOVERY_ROUND: TimerToken = SYS_TIMER + 6;
+const NODE_TABLE: TimerToken = SYS_TIMER + 7;
 const FIRST_SESSION: StreamToken = 0;
 const LAST_SESSION: StreamToken = FIRST_SESSION + MAX_SESSIONS - 1;
 const USER_TIMER: TimerToken = LAST_SESSION + 256;
@@ -71,6 +72,8 @@ const SYS_TIMER: TimerToken = LAST_SESSION + 1;
 const MAINTENANCE_TIMEOUT: Duration = Duration::from_secs(1);
 // for DISCOVERY_REFRESH TimerToken
 const DISCOVERY_REFRESH_TIMEOUT: Duration = Duration::from_secs(60);
+// for FAST_DISCOVERY_REFRESH TimerToken
+const FAST_DISCOVERY_REFRESH_TIMEOUT: Duration = Duration::from_secs(10);
 // for DISCOVERY_ROUND TimerToken
 const DISCOVERY_ROUND_TIMEOUT: Duration = Duration::from_millis(300);
 // for NODE_TABLE TimerToken
@@ -478,10 +481,10 @@ impl Host {
 			let socket = UdpSocket::bind(&udp_addr).expect("Error binding UDP socket");
 			*self.udp_socket.lock() = Some(socket);
 
-			discovery.init_node_list(self.nodes.read().entries());
 			discovery.add_node_list(self.nodes.read().entries());
 			*self.discovery.lock() = Some(discovery);
 			io.register_stream(DISCOVERY)?;
+			io.register_timer(FAST_DISCOVERY_REFRESH, FAST_DISCOVERY_REFRESH_TIMEOUT)?;
 			io.register_timer(DISCOVERY_REFRESH, DISCOVERY_REFRESH_TIMEOUT)?;
 			io.register_timer(DISCOVERY_ROUND, DISCOVERY_ROUND_TIMEOUT)?;
 		}
@@ -533,6 +536,18 @@ impl Host {
 		}
 	}
 
+	fn has_enough_peers(&self) -> bool {
+		let min_peers = {
+			let info = self.info.read();
+			let config = &info.config;
+
+			config.min_peers
+		};
+		let (_, egress_count, ingress_count) = self.session_count();
+
+		return egress_count + ingress_count >= min_peers as usize;
+	}
+
 	fn connect_peers(&self, io: &IoContext<NetworkIoMessage>) {
 		let (min_peers, mut pin, max_handshakes, allow_ips, self_id) = {
 			let info = self.info.read();
@@ -736,11 +751,14 @@ impl Host {
 							let max_ingress = max(max_peers - min_peers, min_peers / 2);
 							if reserved_only ||
 								(s.info.originated && egress_count > min_peers) ||
-								(!s.info.originated && ingress_count > max_ingress) && !self.reserved_nodes.read().contains(&id) {
-								// only proceed if the connecting peer is reserved.
-								s.disconnect(io, DisconnectReason::TooManyPeers);
-								kill = true;
-								break;
+								(!s.info.originated && ingress_count > max_ingress) {
+								if !self.reserved_nodes.read().contains(&id) {
+									// only proceed if the connecting peer is reserved.
+									trace!(target: "network", "Disconnecting non-reserved peer {:?}", id);
+									s.disconnect(io, DisconnectReason::TooManyPeers);
+									kill = true;
+									break;
+								}
 							}
 
 							if !self.filter.as_ref().map_or(true, |f| f.connection_allowed(&self_id, &id, ConnectionDirection::Inbound)) {
@@ -1014,16 +1032,23 @@ impl IoHandler<NetworkIoMessage> for Host {
 			IDLE => self.maintain_network(io),
 			FIRST_SESSION ... LAST_SESSION => self.connection_timeout(token, io),
 			DISCOVERY_REFRESH => {
-				if let Some(d) = self.discovery.lock().as_mut() {
-					d.refresh();
-                                }
+				// Run the _slow_ discovery if enough peers are connected
+				if !self.has_enough_peers() {
+					return;
+				}
+				self.discovery.lock().as_mut().map(|d| d.refresh());
 				io.update_registration(DISCOVERY).unwrap_or_else(|e| debug!("Error updating discovery registration: {:?}", e));
 			},
-			DISCOVERY_ROUND => {
-				let node_changes = { self.discovery.lock().as_mut().and_then(|d| d.round()) };
-				if let Some(node_changes) = node_changes {
-					self.update_nodes(io, node_changes);
+			FAST_DISCOVERY_REFRESH => {
+				// Run the fast discovery if not enough peers are connected
+				if self.has_enough_peers() {
+					return;
 				}
+				self.discovery.lock().as_mut().map(|d| d.refresh());
+				io.update_registration(DISCOVERY).unwrap_or_else(|e| debug!("Error updating discovery registration: {:?}", e));
+			},
+			DISCOVERY_ROUND => {
+				self.discovery.lock().as_mut().map(|d| d.round());
 				io.update_registration(DISCOVERY).unwrap_or_else(|e| debug!("Error updating discovery registration: {:?}", e));
 			},
 			NODE_TABLE => {
diff --git a/util/network-devp2p/src/node_table.rs b/util/network-devp2p/src/node_table.rs
index 7d1380907ba..d689676daf9 100644
--- a/util/network-devp2p/src/node_table.rs
+++ b/util/network-devp2p/src/node_table.rs
@@ -385,7 +385,7 @@ impl NodeTable {
 			None => return,
 		};
 		if let Err(e) = fs::create_dir_all(&path) {
-			warn!("Error creating node table directory: {:?}", e);
+			warn!(target: "network", "Error creating node table directory: {:?}", e);
 			return;
 		}
 		path.push(NODES_FILE);
@@ -400,11 +400,11 @@ impl NodeTable {
 		match fs::File::create(&path) {
 			Ok(file) => {
 				if let Err(e) = serde_json::to_writer_pretty(file, &table) {
-					warn!("Error writing node table file: {:?}", e);
+					warn!(target: "network", "Error writing node table file: {:?}", e);
 				}
 			},
 			Err(e) => {
-				warn!("Error creating node table file: {:?}", e);
+				warn!(target: "network", "Error creating node table file: {:?}", e);
 			}
 		}
 	}
@@ -418,7 +418,7 @@ impl NodeTable {
 		let file = match fs::File::open(&path) {
 			Ok(file) => file,
 			Err(e) => {
-				debug!("Error opening node table file: {:?}", e);
+				debug!(target: "network", "Error opening node table file: {:?}", e);
 				return Default::default();
 			},
 		};
@@ -431,7 +431,7 @@ impl NodeTable {
 					.collect()
 			},
 			Err(e) => {
-				warn!("Error reading node table file: {:?}", e);
+				warn!(target: "network", "Error reading node table file: {:?}", e);
 				Default::default()
 			},
 		}
@@ -624,19 +624,29 @@ mod tests {
 
 		// unknown - node 6
 
+		// nodes are also ordered according to their addition time
+		//
+		// nanosecond precision lost since mac os x high sierra update so let's not compare their order
+		// https://github.com/paritytech/parity-ethereum/issues/9632
 		let r = table.nodes(&IpFilter::default());
 
-		assert_eq!(r[0][..], id4[..]); // most recent success
-		assert_eq!(r[1][..], id3[..]);
+		// most recent success
+		assert!(
+			(r[0] == id4 && r[1] == id3) ||
+			(r[0] == id3 && r[1] == id4)
+		);
 
 		// unknown (old contacts and new nodes), randomly shuffled
 		assert!(
-			r[2][..] == id5[..] && r[3][..] == id6[..] ||
-			r[2][..] == id6[..] && r[3][..] == id5[..]
+			(r[2] == id5 && r[3] == id6) ||
+			(r[2] == id6 && r[3] == id5)
 		);
 
-		assert_eq!(r[4][..], id1[..]); // oldest failure
-		assert_eq!(r[5][..], id2[..]);
+		// oldest failure
+		assert!(
+			(r[4] == id1 && r[5] == id2) ||
+			(r[4] == id2 && r[5] == id1)
+		);
 	}
 
 	#[test]
diff --git a/util/patricia-trie-ethereum/Cargo.toml b/util/patricia-trie-ethereum/Cargo.toml
index 174eb81afbe..a4121a0ba80 100644
--- a/util/patricia-trie-ethereum/Cargo.toml
+++ b/util/patricia-trie-ethereum/Cargo.toml
@@ -6,7 +6,7 @@ description = "Merkle-Patricia Trie (Ethereum Style)"
 license = "GPL-3.0"
 
 [dependencies]
-patricia-trie = "0.2.1"
+patricia-trie = "0.2"
 keccak-hasher = { version = "0.1.1", path = "../keccak-hasher" }
 hashdb = "0.2"
 rlp = { version = "0.2.4", features = ["ethereum"] }
diff --git a/util/version/Cargo.toml b/util/version/Cargo.toml
index 8a06a5eb5df..2f6cd6496d1 100644
--- a/util/version/Cargo.toml
+++ b/util/version/Cargo.toml
@@ -3,21 +3,21 @@
 [package]
 name = "parity-version"
 # NOTE: this value is used for Parity Ethereum version string (via env CARGO_PKG_VERSION)
-version = "2.1.0"
+version = "2.1.6"
 authors = ["Parity Technologies <admin@parity.io>"]
 build = "build.rs"
 
 [package.metadata]
 # This versions track. Should be changed to `stable` or `beta` when on respective branches.
 # Used by auto-updater and for Parity version string.
-track = "nightly"
+track = "stable"
 
 # Network specific settings, used ONLY by auto-updater.
 # Latest supported fork blocks.
 # Indicates a critical release in this track (i.e. consensus issue).
 [package.metadata.networks]
 foundation = { forkBlock = 4370000, critical = false }
-ropsten = { forkBlock = 10, critical = false }
+ropsten = { forkBlock = 4230000, critical = false }
 kovan = { forkBlock = 6600000, critical = false }
 
 [dependencies]