diff --git a/libraries/app/api.cpp b/libraries/app/api.cpp
index 09d42c0330..677189097a 100644
--- a/libraries/app/api.cpp
+++ b/libraries/app/api.cpp
@@ -40,7 +40,7 @@
 #include <fc/smart_ref_impl.hpp>
 
 namespace graphene { namespace app {
-
+     
     login_api::login_api(application& a)
     :_app(a)
     {
@@ -90,6 +90,10 @@ namespace graphene { namespace app {
        {
           _network_node_api = std::make_shared< network_node_api >( std::ref(_app) );
        }
+       else if( api_name == "crypto_api" )
+       {
+          _crypto_api = std::make_shared< crypto_api >();
+       }
        return;
     }
 
@@ -199,6 +203,12 @@ namespace graphene { namespace app {
        FC_ASSERT(_history_api);
        return *_history_api;
     }
+    
+    fc::api<crypto_api> login_api::crypto() const
+    {
+       FC_ASSERT(_crypto_api);
+       return *_crypto_api;
+    }
 
     vector<account_id_type> get_relevant_accounts( const object* obj )
     {
@@ -407,5 +417,75 @@ namespace graphene { namespace app {
        }
        return result;
     } FC_CAPTURE_AND_RETHROW( (a)(b)(bucket_seconds)(start)(end) ) }
+    
+    crypto_api::crypto_api(){};
+    
+    blind_signature crypto_api::blind_sign( const extended_private_key_type& key, const blinded_hash& hash, int i )
+    {
+       return fc::ecc::extended_private_key( key ).blind_sign( hash, i );
+    }
+         
+    signature_type crypto_api::unblind_signature( const extended_private_key_type& key,
+                                                     const extended_public_key_type& bob,
+                                                     const blind_signature& sig,
+                                                     const fc::sha256& hash,
+                                                     int i )
+    {
+       return fc::ecc::extended_private_key( key ).unblind_signature( extended_public_key( bob ), sig, hash, i );
+    }
+                                                               
+    commitment_type crypto_api::blind( const blind_factor_type& blind, uint64_t value )
+    {
+       return fc::ecc::blind( blind, value );
+    }
+   
+    blind_factor_type crypto_api::blind_sum( const std::vector<blind_factor_type>& blinds_in, uint32_t non_neg )
+    {
+       return fc::ecc::blind_sum( blinds_in, non_neg );
+    }
+   
+    bool crypto_api::verify_sum( const std::vector<commitment_type>& commits_in, const std::vector<commitment_type>& neg_commits_in, int64_t excess )
+    {
+       return fc::ecc::verify_sum( commits_in, neg_commits_in, excess );
+    }
+    
+    verify_range_result crypto_api::verify_range( const commitment_type& commit, const std::vector<char>& proof )
+    {
+       verify_range_result result;
+       result.success = fc::ecc::verify_range( result.min_val, result.max_val, commit, proof );
+       return result;
+    }
+    
+    std::vector<char> crypto_api::range_proof_sign( uint64_t min_value, 
+                                                    const commitment_type& commit, 
+                                                    const blind_factor_type& commit_blind, 
+                                                    const blind_factor_type& nonce,
+                                                    int8_t base10_exp,
+                                                    uint8_t min_bits,
+                                                    uint64_t actual_value )
+    {
+       return fc::ecc::range_proof_sign( min_value, commit, commit_blind, nonce, base10_exp, min_bits, actual_value );
+    }
+                               
+    verify_range_proof_rewind_result crypto_api::verify_range_proof_rewind( const blind_factor_type& nonce,
+                                                                            const commitment_type& commit, 
+                                                                            const std::vector<char>& proof )
+    {
+       verify_range_proof_rewind_result result;
+       result.success = fc::ecc::verify_range_proof_rewind( result.blind_out, 
+                                                            result.value_out, 
+                                                            result.message_out, 
+                                                            nonce, 
+                                                            result.min_val, 
+                                                            result.max_val, 
+                                                            const_cast< commitment_type& >( commit ), 
+                                                            proof );
+       return result;
+    }
+                                    
+    range_proof_info crypto_api::range_get_info( const std::vector<char>& proof )
+    {
+       return fc::ecc::range_get_info( proof );
+    }
 
 } } // graphene::app
diff --git a/libraries/app/application.cpp b/libraries/app/application.cpp
index 39e7cff3f0..2227844594 100644
--- a/libraries/app/application.cpp
+++ b/libraries/app/application.cpp
@@ -389,6 +389,7 @@ namespace detail {
             wild_access.allowed_apis.push_back( "database_api" );
             wild_access.allowed_apis.push_back( "network_broadcast_api" );
             wild_access.allowed_apis.push_back( "history_api" );
+            wild_access.allowed_apis.push_back( "crypto_api" );
             _apiaccess.permission_map["*"] = wild_access;
          }
 
diff --git a/libraries/app/include/graphene/app/api.hpp b/libraries/app/include/graphene/app/api.hpp
index 04b41f6cf2..59c905d41e 100644
--- a/libraries/app/include/graphene/app/api.hpp
+++ b/libraries/app/include/graphene/app/api.hpp
@@ -26,6 +26,7 @@
 #include <graphene/app/database_api.hpp>
 
 #include <graphene/chain/protocol/types.hpp>
+#include <graphene/chain/protocol/confidential.hpp>
 
 #include <graphene/market_history/market_history_plugin.hpp>
 
@@ -33,6 +34,7 @@
 
 #include <fc/api.hpp>
 #include <fc/optional.hpp>
+#include <fc/crypto/elliptic.hpp>
 #include <fc/network/ip.hpp>
 
 #include <boost/container/flat_set.hpp>
@@ -45,10 +47,27 @@
 namespace graphene { namespace app {
    using namespace graphene::chain;
    using namespace graphene::market_history;
+   using namespace fc::ecc;
    using namespace std;
 
    class application;
 
+   struct verify_range_result
+   {
+      bool        success;
+      uint64_t    min_val;
+      uint64_t    max_val;
+   };
+   
+   struct verify_range_proof_rewind_result
+   {
+      bool                          success;
+      uint64_t                      min_val;
+      uint64_t                      max_val;
+      uint64_t                      value_out;
+      fc::ecc::blind_factor_type    blind_out;
+      string                        message_out;
+   };
 
    /**
     * @brief The history_api class implements the RPC API for account history
@@ -176,6 +195,44 @@ namespace graphene { namespace app {
       private:
          application& _app;
    };
+   
+   class crypto_api
+   {
+      public:
+         crypto_api();
+         
+         fc::ecc::blind_signature blind_sign( const extended_private_key_type& key, const fc::ecc::blinded_hash& hash, int i );
+         
+         signature_type unblind_signature( const extended_private_key_type& key,
+                                              const extended_public_key_type& bob,
+                                              const fc::ecc::blind_signature& sig,
+                                              const fc::sha256& hash,
+                                              int i );
+                                                                  
+         fc::ecc::commitment_type blind( const fc::ecc::blind_factor_type& blind, uint64_t value );
+         
+         fc::ecc::blind_factor_type blind_sum( const std::vector<blind_factor_type>& blinds_in, uint32_t non_neg );
+         
+         bool verify_sum( const std::vector<commitment_type>& commits_in, const std::vector<commitment_type>& neg_commits_in, int64_t excess );
+         
+         verify_range_result verify_range( const fc::ecc::commitment_type& commit, const std::vector<char>& proof );
+         
+         std::vector<char> range_proof_sign( uint64_t min_value, 
+                                             const commitment_type& commit, 
+                                             const blind_factor_type& commit_blind, 
+                                             const blind_factor_type& nonce,
+                                             int8_t base10_exp,
+                                             uint8_t min_bits,
+                                             uint64_t actual_value );
+                                       
+         
+         verify_range_proof_rewind_result verify_range_proof_rewind( const blind_factor_type& nonce,
+                                                                     const fc::ecc::commitment_type& commit, 
+                                                                     const std::vector<char>& proof );
+         
+                                         
+         range_proof_info range_get_info( const std::vector<char>& proof );
+   };
 
    /**
     * @brief The login_api class implements the bottom layer of the RPC API
@@ -206,6 +263,8 @@ namespace graphene { namespace app {
          fc::api<history_api> history()const;
          /// @brief Retrieve the network node API
          fc::api<network_node_api> network_node()const;
+         /// @brief Retrieve the cryptography API
+         fc::api<crypto_api> crypto()const;
 
       private:
          /// @brief Called to enable an API, not reflected.
@@ -216,12 +275,19 @@ namespace graphene { namespace app {
          optional< fc::api<network_broadcast_api> > _network_broadcast_api;
          optional< fc::api<network_node_api> > _network_node_api;
          optional< fc::api<history_api> >  _history_api;
+         optional< fc::api<crypto_api> > _crypto_api;
    };
 
 }}  // graphene::app
 
 FC_REFLECT( graphene::app::network_broadcast_api::transaction_confirmation,
         (id)(block_num)(trx_num)(trx) )
+FC_REFLECT( graphene::app::verify_range_result,
+        (success)(min_val)(max_val) )
+FC_REFLECT( graphene::app::verify_range_proof_rewind_result,
+        (success)(min_val)(max_val)(value_out)(blind_out)(message_out) )
+//FC_REFLECT_TYPENAME( fc::ecc::compact_signature );
+//FC_REFLECT_TYPENAME( fc::ecc::commitment_type );
 
 FC_API(graphene::app::history_api,
        (get_account_history)
@@ -242,10 +308,22 @@ FC_API(graphene::app::network_node_api,
        (get_advanced_node_parameters)
        (set_advanced_node_parameters)
      )
+FC_API(graphene::app::crypto_api,
+       (blind_sign)
+       (unblind_signature)
+       (blind)
+       (blind_sum)
+       (verify_sum)
+       (verify_range)
+       (range_proof_sign)
+       (verify_range_proof_rewind)
+       (range_get_info)
+     )
 FC_API(graphene::app::login_api,
        (login)
        (network_broadcast)
        (database)
        (history)
        (network_node)
+       (crypto)
      )
diff --git a/libraries/chain/include/graphene/chain/protocol/types.hpp b/libraries/chain/include/graphene/chain/protocol/types.hpp
index aa83d3284c..3652ef5e13 100644
--- a/libraries/chain/include/graphene/chain/protocol/types.hpp
+++ b/libraries/chain/include/graphene/chain/protocol/types.hpp
@@ -251,16 +251,67 @@ namespace graphene { namespace chain {
        bool is_valid_v1( const std::string& base58str );
    };
 
+   struct extended_public_key_type
+   {
+      struct binary_key
+      {
+         binary_key() {}
+         uint32_t                   check = 0;
+         fc::ecc::extended_key_data data;
+      };
+      
+      fc::ecc::extended_key_data key_data;
+       
+      extended_public_key_type();
+      extended_public_key_type( const fc::ecc::extended_key_data& data );
+      extended_public_key_type( const fc::ecc::extended_public_key& extpubkey );
+      explicit extended_public_key_type( const std::string& base58str );
+      operator fc::ecc::extended_public_key() const;
+      explicit operator std::string() const;
+      friend bool operator == ( const extended_public_key_type& p1, const fc::ecc::extended_public_key& p2);
+      friend bool operator == ( const extended_public_key_type& p1, const extended_public_key_type& p2);
+      friend bool operator != ( const extended_public_key_type& p1, const extended_public_key_type& p2);
+   };
+   
+   struct extended_private_key_type
+   {
+      struct binary_key
+      {
+         binary_key() {}
+         uint32_t                   check = 0;
+         fc::ecc::extended_key_data data;
+      };
+      
+      fc::ecc::extended_key_data key_data;
+       
+      extended_private_key_type();
+      extended_private_key_type( const fc::ecc::extended_key_data& data );
+      extended_private_key_type( const fc::ecc::extended_private_key& extprivkey );
+      explicit extended_private_key_type( const std::string& base58str );
+      operator fc::ecc::extended_private_key() const;
+      explicit operator std::string() const;
+      friend bool operator == ( const extended_private_key_type& p1, const fc::ecc::extended_private_key& p2);
+      friend bool operator == ( const extended_private_key_type& p1, const extended_private_key_type& p2);
+      friend bool operator != ( const extended_private_key_type& p1, const extended_private_key_type& p2);
+   };
 } }  // graphene::chain
 
 namespace fc
 {
     void to_variant( const graphene::chain::public_key_type& var,  fc::variant& vo );
     void from_variant( const fc::variant& var,  graphene::chain::public_key_type& vo );
+    void to_variant( const graphene::chain::extended_public_key_type& var, fc::variant& vo );
+    void from_variant( const fc::variant& var, graphene::chain::extended_public_key_type& vo );
+    void to_variant( const graphene::chain::extended_private_key_type& var, fc::variant& vo );
+    void from_variant( const fc::variant& var, graphene::chain::extended_private_key_type& vo );
 }
 
 FC_REFLECT( graphene::chain::public_key_type, (key_data) )
 FC_REFLECT( graphene::chain::public_key_type::binary_key, (data)(check) )
+FC_REFLECT( graphene::chain::extended_public_key_type, (key_data) )
+FC_REFLECT( graphene::chain::extended_public_key_type::binary_key, (check)(data) )
+FC_REFLECT( graphene::chain::extended_private_key_type, (key_data) )
+FC_REFLECT( graphene::chain::extended_private_key_type::binary_key, (check)(data) )
 
 FC_REFLECT_ENUM( graphene::chain::object_type,
                  (null_object_type)
diff --git a/libraries/chain/protocol/types.cpp b/libraries/chain/protocol/types.cpp
index aef7cf1030..ac5ad8c83a 100644
--- a/libraries/chain/protocol/types.cpp
+++ b/libraries/chain/protocol/types.cpp
@@ -111,6 +111,114 @@ namespace graphene { namespace chain {
     {
        return p1.key_data != p2.key_data;
     }
+    
+    // extended_public_key_type
+    
+    extended_public_key_type::extended_public_key_type():key_data(){};
+    
+    extended_public_key_type::extended_public_key_type( const fc::ecc::extended_key_data& data )
+       :key_data( data ){};
+    
+    extended_public_key_type::extended_public_key_type( const fc::ecc::extended_public_key& extpubkey )
+    {
+       key_data = extpubkey.serialize_extended();
+    };
+      
+    extended_public_key_type::extended_public_key_type( const std::string& base58str )
+    {
+       std::string prefix( GRAPHENE_ADDRESS_PREFIX );
+
+       const size_t prefix_len = prefix.size();
+       FC_ASSERT( base58str.size() > prefix_len );
+       FC_ASSERT( base58str.substr( 0, prefix_len ) ==  prefix , "", ("base58str", base58str) );
+       auto bin = fc::from_base58( base58str.substr( prefix_len ) );
+       auto bin_key = fc::raw::unpack<binary_key>(bin);
+       FC_ASSERT( fc::ripemd160::hash( bin_key.data.data, bin_key.data.size() )._hash[0] == bin_key.check );
+       key_data = bin_key.data;
+    }
+
+    extended_public_key_type::operator fc::ecc::extended_public_key() const
+    {
+       return fc::ecc::extended_public_key::deserialize( key_data );
+    }
+    
+    extended_public_key_type::operator std::string() const
+    {
+       binary_key k;
+       k.data = key_data;
+       k.check = fc::ripemd160::hash( k.data.data, k.data.size() )._hash[0];
+       auto data = fc::raw::pack( k );
+       return GRAPHENE_ADDRESS_PREFIX + fc::to_base58( data.data(), data.size() );
+    }
+    
+    bool operator == ( const extended_public_key_type& p1, const fc::ecc::extended_public_key& p2)
+    {
+       return p1.key_data == p2.serialize_extended();
+    }
+
+    bool operator == ( const extended_public_key_type& p1, const extended_public_key_type& p2)
+    {
+       return p1.key_data == p2.key_data;
+    }
+
+    bool operator != ( const extended_public_key_type& p1, const extended_public_key_type& p2)
+    {
+       return p1.key_data != p2.key_data;
+    }
+    
+    // extended_private_key_type
+    
+    extended_private_key_type::extended_private_key_type():key_data(){};
+    
+    extended_private_key_type::extended_private_key_type( const fc::ecc::extended_key_data& data )
+       :key_data( data ){};
+       
+    extended_private_key_type::extended_private_key_type( const fc::ecc::extended_private_key& extprivkey )
+    {
+       key_data = extprivkey.serialize_extended();
+    };
+    
+    extended_private_key_type::extended_private_key_type( const std::string& base58str )
+    {
+       std::string prefix( GRAPHENE_ADDRESS_PREFIX );
+
+       const size_t prefix_len = prefix.size();
+       FC_ASSERT( base58str.size() > prefix_len );
+       FC_ASSERT( base58str.substr( 0, prefix_len ) ==  prefix , "", ("base58str", base58str) );
+       auto bin = fc::from_base58( base58str.substr( prefix_len ) );
+       auto bin_key = fc::raw::unpack<binary_key>(bin);
+       FC_ASSERT( fc::ripemd160::hash( bin_key.data.data, bin_key.data.size() )._hash[0] == bin_key.check );
+       key_data = bin_key.data;
+    }
+    
+    extended_private_key_type::operator fc::ecc::extended_private_key() const
+    {
+       return fc::ecc::extended_private_key::deserialize( key_data );
+    }
+    
+    extended_private_key_type::operator std::string() const
+    {
+       binary_key k;
+       k.data = key_data;
+       k.check = fc::ripemd160::hash( k.data.data, k.data.size() )._hash[0];
+       auto data = fc::raw::pack( k );
+       return GRAPHENE_ADDRESS_PREFIX + fc::to_base58( data.data(), data.size() );
+    }
+    
+    bool operator == ( const extended_private_key_type& p1, const fc::ecc::extended_public_key& p2)
+    {
+       return p1.key_data == p2.serialize_extended();
+    }
+
+    bool operator == ( const extended_private_key_type& p1, const extended_private_key_type& p2)
+    {
+       return p1.key_data == p2.key_data;
+    }
+
+    bool operator != ( const extended_private_key_type& p1, const extended_private_key_type& p2)
+    {
+       return p1.key_data != p2.key_data;
+    }
 
 } } // graphene::chain
 
@@ -119,12 +227,31 @@ namespace fc
     using namespace std;
     void to_variant( const graphene::chain::public_key_type& var,  fc::variant& vo )
     {
-        vo = std::string(var);
+        vo = std::string( var );
     }
 
     void from_variant( const fc::variant& var,  graphene::chain::public_key_type& vo )
     {
         vo = graphene::chain::public_key_type( var.as_string() );
     }
+    
+    void to_variant( const graphene::chain::extended_public_key_type& var, fc::variant& vo )
+    {
+       vo = std::string( var );
+    }
+    
+    void from_variant( const fc::variant& var, graphene::chain::extended_public_key_type& vo )
+    {
+       vo = graphene::chain::extended_public_key_type( var.as_string() );
+    }
 
+    void to_variant( const graphene::chain::extended_private_key_type& var, fc::variant& vo )
+    {
+       vo = std::string( var );
+    }
+    
+    void from_variant( const fc::variant& var, graphene::chain::extended_private_key_type& vo )
+    {
+       vo = graphene::chain::extended_private_key_type( var.as_string() );
+    }
 } // fc
diff --git a/tests/tests/serialization_tests.cpp b/tests/tests/serialization_tests.cpp
index 54efa6081a..84fced8e8c 100644
--- a/tests/tests/serialization_tests.cpp
+++ b/tests/tests/serialization_tests.cpp
@@ -28,6 +28,7 @@
 
 
 #include <fc/crypto/digest.hpp>
+#include <fc/crypto/elliptic.hpp>
 #include <fc/reflect/variant.hpp>
 
 #include "../common/database_fixture.hpp"
@@ -85,4 +86,40 @@ BOOST_AUTO_TEST_CASE( json_tests )
    }
 }
 
+BOOST_AUTO_TEST_CASE( extended_private_key_type_test )
+{
+   try
+   {
+     fc::ecc::extended_private_key key = fc::ecc::extended_private_key( fc::ecc::private_key::generate(),
+                                                                       fc::sha256(),
+                                                                       0, 0, 0 );
+      extended_private_key_type type = extended_private_key_type( key );
+      std::string packed = std::string( type );
+      extended_private_key_type unpacked = extended_private_key_type( packed );
+      BOOST_CHECK( type == unpacked );
+   } catch ( const fc::exception& e )
+   {
+      edump((e.to_detail_string()));
+      throw;
+   }
+}
+
+BOOST_AUTO_TEST_CASE( extended_public_key_type_test )
+{
+   try
+   {
+      fc::ecc::extended_public_key key = fc::ecc::extended_public_key( fc::ecc::private_key::generate().get_public_key(),
+                                                                       fc::sha256(),
+                                                                       0, 0, 0 );
+      extended_public_key_type type = extended_public_key_type( key );
+      std::string packed = std::string( type );
+      extended_public_key_type unpacked = extended_public_key_type( packed );
+      BOOST_CHECK( type == unpacked );
+   } catch ( const fc::exception& e )
+   {
+      edump((e.to_detail_string()));
+      throw;
+   }
+}
+
 BOOST_AUTO_TEST_SUITE_END()