diff --git a/configure.ac b/configure.ac
index 64ad1b248947..74b6073381ed 100644
--- a/configure.ac
+++ b/configure.ac
@@ -440,6 +440,7 @@ if test "x$CXXFLAGS_overridden" = "xno"; then
   AX_CHECK_COMPILE_FLAG([-Wrange-loop-analysis],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wrange-loop-analysis"],,[[$CXXFLAG_WERROR]])
   AX_CHECK_COMPILE_FLAG([-Wredundant-decls],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wredundant-decls"],,[[$CXXFLAG_WERROR]])
   AX_CHECK_COMPILE_FLAG([-Wunused-variable],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wunused-variable"],,[[$CXXFLAG_WERROR]])
+  AX_CHECK_COMPILE_FLAG([-Wunused-member-function],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wunused-member-function"],,[[$CXXFLAG_WERROR]])
   AX_CHECK_COMPILE_FLAG([-Wdate-time],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wdate-time"],,[[$CXXFLAG_WERROR]])
   AX_CHECK_COMPILE_FLAG([-Wconditional-uninitialized],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wconditional-uninitialized"],,[[$CXXFLAG_WERROR]])
   AX_CHECK_COMPILE_FLAG([-Wsuggest-override],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wsuggest-override"],,[[$CXXFLAG_WERROR]],
@@ -645,9 +646,6 @@ case $host in
      fi
 
      CPPFLAGS="$CPPFLAGS -D_MT -DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB -D_WIN32_WINNT=0x0601"
-     if test "x$CXXFLAGS_overridden" = "xno"; then
-       CXXFLAGS="$CXXFLAGS -w"
-     fi
 
      dnl libtool insists upon adding -nostdlib and a list of objects/libs to link against.
      dnl That breaks our ability to build dll's with static libgcc/libstdc++/libssp. Override
diff --git a/contrib/macdeploy/custom_dsstore.py b/contrib/macdeploy/custom_dsstore.py
index eed3d578a43e..d7af07e9ed69 100755
--- a/contrib/macdeploy/custom_dsstore.py
+++ b/contrib/macdeploy/custom_dsstore.py
@@ -2,7 +2,6 @@
 # Copyright (c) 2013-2015 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
-import biplist
 from ds_store import DSStore
 from mac_alias import Alias
 import sys
@@ -47,7 +46,7 @@
 alias.volume.disk_image_alias.target.carbon_path = 'Macintosh HD:Users:\x00dashcoreuser:\x00Documents:\x00dashcore:\x00dashcore:\x00' + package_name_ns + '.temp.dmg'
 alias.volume.disk_image_alias.target.posix_path = 'Users/dashcoreuser/Documents/dashcore/dashcore/' + package_name_ns + '.temp.dmg'
 alias.target.carbon_path = package_name_ns + ':.background:\x00background.tiff'
-icvp['backgroundImageAlias'] = biplist.Data(alias.to_bytes())
+icvp['backgroundImageAlias'] = alias.to_bytes()
 ds['.']['icvp'] = icvp
 
 ds['.']['vSrn'] = ('long', 1)
diff --git a/depends/packages/native_biplist.mk b/depends/packages/native_biplist.mk
deleted file mode 100644
index c3054cbd1a16..000000000000
--- a/depends/packages/native_biplist.mk
+++ /dev/null
@@ -1,15 +0,0 @@
-package=native_biplist
-$(package)_version=1.0.3
-$(package)_download_path=https://bitbucket.org/wooster/biplist/downloads
-$(package)_file_name=biplist-$($(package)_version).tar.gz
-$(package)_sha256_hash=4c0549764c5fe50b28042ec21aa2e14fe1a2224e239a1dae77d9e7f3932aa4c6
-$(package)_install_libdir=$(build_prefix)/lib/python3/dist-packages
-
-define $(package)_build_cmds
-    python3 setup.py build
-endef
-
-define $(package)_stage_cmds
-    mkdir -p $($(package)_install_libdir) && \
-    python3 setup.py install --root=$($(package)_staging_dir) --prefix=$(build_prefix) --install-lib=$($(package)_install_libdir)
-endef
diff --git a/depends/packages/native_clang.mk b/depends/packages/native_clang.mk
index 36adeb196dc7..25ac77c1a34a 100644
--- a/depends/packages/native_clang.mk
+++ b/depends/packages/native_clang.mk
@@ -1,9 +1,15 @@
 package=native_clang
 $(package)_version=10.0.1
 $(package)_download_path=https://github.com/llvm/llvm-project/releases/download/llvmorg-$($(package)_version)
+ifneq (,$(findstring aarch64,$(BUILD)))
+$(package)_download_file=clang+llvm-$($(package)_version)-aarch64-linux-gnu.tar.xz
+$(package)_file_name=clang+llvm-$($(package)_version)-aarch64-linux-gnu.tar.xz
+$(package)_sha256_hash=90dc69a4758ca15cd0ffa45d07fbf5bf4309d47d2c7745a9f0735ecffde9c31f
+else
 $(package)_download_file=clang+llvm-$($(package)_version)-x86_64-linux-gnu-ubuntu-16.04.tar.xz
 $(package)_file_name=clang+llvm-$($(package)_version)-x86_64-linux-gnu-ubuntu-16.04.tar.xz
 $(package)_sha256_hash=48b83ef827ac2c213d5b64f5ad7ed082c8bcb712b46644e0dc5045c6f462c231
+endif
 
 define $(package)_preprocess_cmds
   rm -f $($(package)_extract_dir)/lib/libc++abi.so*
diff --git a/depends/packages/native_ds_store.mk b/depends/packages/native_ds_store.mk
index f99b689ecdc7..44108925a4f3 100644
--- a/depends/packages/native_ds_store.mk
+++ b/depends/packages/native_ds_store.mk
@@ -1,10 +1,9 @@
 package=native_ds_store
-$(package)_version=1.1.2
+$(package)_version=1.3.0
 $(package)_download_path=https://github.com/al45tair/ds_store/archive/
 $(package)_file_name=v$($(package)_version).tar.gz
-$(package)_sha256_hash=3b3ecb7bf0a5157f5b6010bc3af7c141fb0ad3527084e63336220d22744bc20c
+$(package)_sha256_hash=76b3280cd4e19e5179defa23fb594a9dd32643b0c80d774bd3108361d94fb46d
 $(package)_install_libdir=$(build_prefix)/lib/python3/dist-packages
-$(package)_dependencies=native_biplist
 
 define $(package)_build_cmds
     python3 setup.py build
diff --git a/depends/packages/packages.mk b/depends/packages/packages.mk
index bbff61e598ca..238726054e35 100644
--- a/depends/packages/packages.mk
+++ b/depends/packages/packages.mk
@@ -20,7 +20,7 @@ zmq_packages=zeromq
 upnp_packages=miniupnpc
 natpmp_packages=libnatpmp
 
-darwin_native_packages = native_biplist native_ds_store native_mac_alias
+darwin_native_packages = native_ds_store native_mac_alias
 
 $(host_arch)_$(host_os)_native_packages += native_b2
 
diff --git a/depends/packages/qt.mk b/depends/packages/qt.mk
index 4de8db70a2d3..b733f37c8847 100644
--- a/depends/packages/qt.mk
+++ b/depends/packages/qt.mk
@@ -85,7 +85,6 @@ $(package)_config_opts += -no-feature-colordialog
 $(package)_config_opts += -no-feature-commandlineparser
 $(package)_config_opts += -no-feature-concurrent
 $(package)_config_opts += -no-feature-dial
-$(package)_config_opts += -no-feature-filesystemwatcher
 $(package)_config_opts += -no-feature-fontcombobox
 $(package)_config_opts += -no-feature-ftp
 $(package)_config_opts += -no-feature-image_heuristic_mask
diff --git a/doc/dash-conf.md b/doc/dash-conf.md
index 1d26c703d8f5..9ff7216bb2d2 100644
--- a/doc/dash-conf.md
+++ b/doc/dash-conf.md
@@ -4,6 +4,8 @@ The configuration file is used by `dashd`, `dash-qt` and `dash-cli`.
 
 All command-line options (except for `-?`, `-help`, `-version` and `-conf`) may be specified in a configuration file, and all configuration file options (except for `includeconf`) may also be specified on the command line. Command-line options override values set in the configuration file and configuration file options override values set in the GUI.
 
+Changes to the configuration file while `dashd` or `dash-qt` is running only take effect after restarting.
+
 ## Configuration File Format
 
 The configuration file is a plain text file and consists of `option=value` entries, one per line. Leading and trailing whitespaces are removed.
diff --git a/src/addrman.h b/src/addrman.h
index eaba7a5d408e..6a031a0d513e 100644
--- a/src/addrman.h
+++ b/src/addrman.h
@@ -433,12 +433,18 @@ class CAddrMan
             nUBuckets ^= (1 << 30);
         }
 
-        if (nNew > ADDRMAN_NEW_BUCKET_COUNT * ADDRMAN_BUCKET_SIZE) {
-            throw std::ios_base::failure("Corrupt CAddrMan serialization, nNew exceeds limit.");
+        if (nNew > ADDRMAN_NEW_BUCKET_COUNT * ADDRMAN_BUCKET_SIZE || nNew < 0) {
+            throw std::ios_base::failure(
+                strprintf("Corrupt CAddrMan serialization: nNew=%d, should be in [0, %u]",
+                          nNew,
+                          ADDRMAN_NEW_BUCKET_COUNT * ADDRMAN_BUCKET_SIZE));
         }
 
-        if (nTried > ADDRMAN_TRIED_BUCKET_COUNT * ADDRMAN_BUCKET_SIZE) {
-            throw std::ios_base::failure("Corrupt CAddrMan serialization, nTried exceeds limit.");
+        if (nTried > ADDRMAN_TRIED_BUCKET_COUNT * ADDRMAN_BUCKET_SIZE || nTried < 0) {
+            throw std::ios_base::failure(
+                strprintf("Corrupt CAddrMan serialization: nTried=%d, should be in [0, %u]",
+                          nTried,
+                          ADDRMAN_TRIED_BUCKET_COUNT * ADDRMAN_BUCKET_SIZE));
         }
 
         // Deserialize entries from the new table.
diff --git a/src/index/blockfilterindex.cpp b/src/index/blockfilterindex.cpp
index bf2d2d133a6f..622be4165e8a 100644
--- a/src/index/blockfilterindex.cpp
+++ b/src/index/blockfilterindex.cpp
@@ -57,7 +57,6 @@ struct DBVal {
 struct DBHeightKey {
     int height;
 
-    DBHeightKey() : height(0) {}
     explicit DBHeightKey(int height_in) : height(height_in) {}
 
     template<typename Stream>
diff --git a/src/init.cpp b/src/init.cpp
index 29c32895b610..daf7714fbec0 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -1230,8 +1230,8 @@ bool AppInitBasicSetup()
     _set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT);
 #endif
 #ifdef WIN32
-    // Enable Data Execution Prevention (DEP)
-    SetProcessDEPPolicy(PROCESS_DEP_ENABLE);
+    // Enable heap terminate-on-corruption
+    HeapSetInformation(nullptr, HeapEnableTerminationOnCorruption, nullptr, 0);
 #endif
 
     if (!SetupNetworking())
diff --git a/src/script/dashconsensus.cpp b/src/script/dashconsensus.cpp
index 6f27ca2716de..a504a8f72679 100644
--- a/src/script/dashconsensus.cpp
+++ b/src/script/dashconsensus.cpp
@@ -16,8 +16,7 @@ namespace {
 class TxInputStream
 {
 public:
-    TxInputStream(int nTypeIn, int nVersionIn, const unsigned char *txTo, size_t txToLen) :
-    m_type(nTypeIn),
+    TxInputStream(int nVersionIn, const unsigned char *txTo, size_t txToLen) :
     m_version(nVersionIn),
     m_data(txTo),
     m_remaining(txToLen)
@@ -47,9 +46,7 @@ class TxInputStream
     }
 
     int GetVersion() const { return m_version; }
-    int GetType() const { return m_type; }
 private:
-    const int m_type;
     const int m_version;
     const unsigned char* m_data;
     size_t m_remaining;
@@ -84,7 +81,7 @@ int dashconsensus_verify_script(const unsigned char *scriptPubKey, unsigned int
         return set_error(err, dashconsensus_ERR_INVALID_FLAGS);
     }
     try {
-        TxInputStream stream(SER_NETWORK, PROTOCOL_VERSION, txTo, txToLen);
+        TxInputStream stream(PROTOCOL_VERSION, txTo, txToLen);
         CTransaction tx(deserialize, stream);
         if (nIn >= tx.vin.size())
             return set_error(err, dashconsensus_ERR_TX_INDEX);
diff --git a/src/test/coins_tests.cpp b/src/test/coins_tests.cpp
index 6558a906b404..687138c772dc 100644
--- a/src/test/coins_tests.cpp
+++ b/src/test/coins_tests.cpp
@@ -7,6 +7,7 @@
 #include <script/standard.h>
 #include <streams.h>
 #include <test/util/setup_common.h>
+#include <txdb.h>
 #include <uint256.h>
 #include <undo.h>
 #include <util/strencodings.h>
@@ -108,7 +109,12 @@ static const unsigned int NUM_SIMULATION_ITERATIONS = 40000;
 //
 // During the process, booleans are kept to make sure that the randomized
 // operation hits all branches.
-BOOST_AUTO_TEST_CASE(coins_cache_simulation_test)
+//
+// If fake_best_block is true, assign a random uint256 to mock the recording
+// of best block on flush. This is necessary when using CCoinsViewDB as the base,
+// otherwise we'll hit an assertion in BatchWrite.
+//
+void SimulationTest(CCoinsView* base, bool fake_best_block)
 {
     // Various coverage trackers.
     bool removed_all_caches = false;
@@ -125,9 +131,8 @@ BOOST_AUTO_TEST_CASE(coins_cache_simulation_test)
     std::map<COutPoint, Coin> result;
 
     // The cache stack.
-    CCoinsViewTest base; // A CCoinsViewTest at the bottom.
     std::vector<CCoinsViewCacheTest*> stack; // A stack of CCoinsViewCaches on top.
-    stack.push_back(new CCoinsViewCacheTest(&base)); // Start with one cache.
+    stack.push_back(new CCoinsViewCacheTest(base)); // Start with one cache.
 
     // Use a limited set of random transaction ids, so we do test overwriting entries.
     std::vector<uint256> txids;
@@ -210,6 +215,7 @@ BOOST_AUTO_TEST_CASE(coins_cache_simulation_test)
             // Every 100 iterations, flush an intermediate cache
             if (stack.size() > 1 && InsecureRandBool() == 0) {
                 unsigned int flushIndex = InsecureRandRange(stack.size() - 1);
+                if (fake_best_block) stack[flushIndex]->SetBestBlock(InsecureRand256());
                 BOOST_CHECK(stack[flushIndex]->Flush());
             }
         }
@@ -217,13 +223,14 @@ BOOST_AUTO_TEST_CASE(coins_cache_simulation_test)
             // Every 100 iterations, change the cache stack.
             if (stack.size() > 0 && InsecureRandBool() == 0) {
                 //Remove the top cache
+                if (fake_best_block) stack.back()->SetBestBlock(InsecureRand256());
                 BOOST_CHECK(stack.back()->Flush());
                 delete stack.back();
                 stack.pop_back();
             }
             if (stack.size() == 0 || (stack.size() < 4 && InsecureRandBool())) {
                 //Add a new cache
-                CCoinsView* tip = &base;
+                CCoinsView* tip = base;
                 if (stack.size() > 0) {
                     tip = stack.back();
                 } else {
@@ -255,6 +262,16 @@ BOOST_AUTO_TEST_CASE(coins_cache_simulation_test)
     BOOST_CHECK(uncached_an_entry);
 }
 
+// Run the above simulation for multiple base types.
+BOOST_AUTO_TEST_CASE(coins_cache_simulation_test)
+{
+    CCoinsViewTest base;
+    SimulationTest(&base, false);
+
+    CCoinsViewDB db_base{"test", /*nCacheSize*/ 1 << 23, /*fMemory*/ true, /*fWipe*/ false};
+    SimulationTest(&db_base, true);
+}
+
 // Store of all necessary tx and undo data for next test
 typedef std::map<COutPoint, std::tuple<CTransaction,CTxUndo,Coin>> UtxoData;
 UtxoData utxoData;
diff --git a/src/test/fuzz/FuzzedDataProvider.h b/src/test/fuzz/FuzzedDataProvider.h
index 1b5b4bb01269..36907de14f6e 100644
--- a/src/test/fuzz/FuzzedDataProvider.h
+++ b/src/test/fuzz/FuzzedDataProvider.h
@@ -20,6 +20,7 @@
 #include <algorithm>
 #include <cstring>
 #include <initializer_list>
+#include <limits>
 #include <string>
 #include <type_traits>
 #include <utility>
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index 25dfe6b998b7..3718e7551fa0 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -1257,12 +1257,6 @@ struct Tracker
         copies = t.copies + 1;
         return *this;
     }
-    Tracker& operator=(Tracker&& t) noexcept
-    {
-        origin = t.origin;
-        copies = t.copies;
-        return *this;
-    }
 };
 
 }
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index ab899ce9bc32..486e593e274e 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -4035,7 +4035,7 @@ UniValue walletcreatefundedpsbt(const JSONRPCRequest& request)
                                 {
                                     {"txid", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The transaction id"},
                                     {"vout", RPCArg::Type::NUM, RPCArg::Optional::NO, "The output number"},
-                                    {"sequence", RPCArg::Type::NUM, RPCArg::Optional::NO, "The sequence number"},
+                                    {"sequence", RPCArg::Type::NUM, /* default */ "depends on the value of the 'locktime' argument", "The sequence number"},
                                 },
                             },
                         },