Moving Bitcoin listener to SON plugin

- First buildable version

libraries/app/database_api.cpp

@@ -105,7 +105,7 @@ class database_api_impl : public std::enable_shared_from_this<database_api_impl>
       vector<optional<asset_object>> lookup_asset_symbols(const vector<string>& symbols_or_ids)const;
 
       // Peerplays
-      vector<sport_object>                list_sports() const; 
+      vector<sport_object>                list_sports() const;
       vector<event_group_object>          list_event_groups(sport_id_type sport_id) const;
       vector<event_object>                list_events_in_group(event_group_id_type event_group_id) const;
       vector<betting_market_group_object> list_betting_market_groups(event_id_type) const;
@@ -161,6 +161,9 @@ class database_api_impl : public std::enable_shared_from_this<database_api_impl>
       vector<tournament_object> get_tournaments_by_state(tournament_id_type stop, unsigned limit, tournament_id_type start, tournament_state state);
       vector<tournament_id_type> get_registered_tournaments(account_id_type account_filter, uint32_t limit) const;
 
+      //Sidechain
+      vector<bitcoin_address_object> get_bitcoin_addresses(const account_id_type& acc_id) const;
+
       // gpos
       gpos_info get_gpos_info(const account_id_type account) const;
 
@@ -733,7 +736,7 @@ std::map<std::string, full_account> database_api_impl::get_full_accounts( const
                        acnt.withdraws.emplace_back(withdraw);
                     });
 
-      auto pending_payouts_range = 
+      auto pending_payouts_range =
          _db.get_index_type<pending_dividend_payout_balance_for_holder_object_index>().indices().get<by_account_dividend_payout>().equal_range(boost::make_tuple(account->id));
 
       std::copy(pending_payouts_range.first, pending_payouts_range.second, std::back_inserter(acnt.pending_dividend_payments));
@@ -1965,7 +1968,7 @@ vector<tournament_object> database_api::get_tournaments(tournament_id_type stop,
 
 vector<tournament_object> database_api_impl::get_tournaments(tournament_id_type stop,
                                                              unsigned limit,
-                                                             tournament_id_type start) 
+                                                             tournament_id_type start)
 {
    vector<tournament_object> result;
    const auto& tournament_idx = _db.get_index_type<tournament_index>().indices().get<by_id>();
@@ -1992,7 +1995,7 @@ vector<tournament_object> database_api_impl::get_tournaments_by_state(tournament
                                                                       unsigned limit,
                                                                       tournament_id_type start,
                                                                       tournament_state state)
-{   
+{
    vector<tournament_object> result;
    const auto& tournament_idx = _db.get_index_type<tournament_index>().indices().get<by_id>();
    for (auto elem: tournament_idx) {
@@ -2023,6 +2026,32 @@ vector<tournament_id_type> database_api_impl::get_registered_tournaments(account
    return tournament_ids;
 }
 
+//////////////////////////////////////////////////////////////////////
+//                                                                  //
+// Sidechain                                                        //
+//                                                                  //
+//////////////////////////////////////////////////////////////////////
+
+vector<bitcoin_address_object> database_api::get_bitcoin_addresses(const account_id_type& acc) const
+{
+   return my->get_bitcoin_addresses(acc);
+}
+
+vector<bitcoin_address_object> database_api_impl::get_bitcoin_addresses(const account_id_type& acc) const
+{
+   vector<bitcoin_address_object> result;
+
+   const auto& btc_addr_idx = _db.get_index_type<bitcoin_address_index>().indices().get<by_owner>();
+
+   auto itr = btc_addr_idx.lower_bound( acc );
+   while( itr != btc_addr_idx.end() && itr->owner == acc )
+   {
+      result.push_back( *itr );
+      ++itr;
+   }
+   return result;
+}
+
 //////////////////////////////////////////////////////////////////////
 //                                                                  //
 // GPOS methods                                                     //
@@ -2170,7 +2199,7 @@ void database_api_impl::handle_object_changed(bool force_notify, bool full_objec
    /// if a connection hangs then this could get backed up and result in
    /// a failure to exit cleanly.
    //fc::async([capture_this,this,updates,market_broadcast_queue](){
-   //if( _subscribe_callback ) 
+   //if( _subscribe_callback )
    //         _subscribe_callback( updates );
 
       for(auto id : ids)

libraries/app/impacted.cpp

@@ -286,8 +286,8 @@ struct get_impacted_account_visitor
 
 void operation_get_impacted_accounts( const operation& op, flat_set<account_id_type>& result )
 {
-   get_impacted_account_visitor vtor = get_impacted_account_visitor( result );
-   op.visit( vtor );
+   //get_impacted_account_visitor vtor = get_impacted_account_visitor( result );
+   //op.visit( vtor );
 }
 
 void transaction_get_impacted_accounts( const transaction& tx, flat_set<account_id_type>& result )

libraries/app/include/graphene/app/database_api.hpp

@@ -47,6 +47,7 @@
 #include <graphene/chain/worker_object.hpp>
 #include <graphene/chain/witness_object.hpp>
 #include <graphene/chain/tournament_object.hpp>
+#include <graphene/chain/bitcoin_address_object.hpp>
 
 #include <graphene/market_history/market_history_plugin.hpp>
 
@@ -651,6 +652,11 @@ class database_api
        */
       vector<tournament_id_type> get_registered_tournaments(account_id_type account_filter, uint32_t limit) const;
 
+      /**
+       * @return the list of bitcoin addresses which belong to acc_id
+       */
+      vector<bitcoin_address_object> get_bitcoin_addresses(const account_id_type& acc_id) const;
+
       //////////
       // GPOS //
       //////////
@@ -783,6 +789,7 @@ FC_API(graphene::app::database_api,
    (get_tournaments_by_state)
    (get_tournaments )
    (get_registered_tournaments)
+   (get_bitcoin_addresses)
 
    // gpos
    (get_gpos_info)

libraries/chain/CMakeLists.txt

@@ -21,6 +21,7 @@ if( GRAPHENE_DISABLE_UNITY_BUILD )
         db_market.cpp
         db_update.cpp
         db_witness_schedule.cpp
+        db_sidechain.cpp
       )
    message( STATUS "Graphene database unity build disabled" )
 else( GRAPHENE_DISABLE_UNITY_BUILD )
@@ -85,6 +86,9 @@ add_library( graphene_chain
              confidential_evaluator.cpp
              special_authority.cpp
              buyback.cpp
+             bitcoin_address_evaluator.cpp
+             bitcoin_transaction_evaluator.cpp
+             sidechain_evaluator.cpp
 
              account_object.cpp
              asset_object.cpp
@@ -110,6 +114,7 @@ add_library( graphene_chain
              betting_market_group_object.cpp
 
              affiliate_payout.cpp
+             withdraw_pbtc_evaluator.cpp
 
              ${HEADERS}
              ${PROTOCOL_HEADERS}
@@ -117,9 +122,11 @@ add_library( graphene_chain
            )
 
 add_dependencies( graphene_chain build_hardfork_hpp )
-target_link_libraries( graphene_chain fc graphene_db )
+
+target_link_libraries( graphene_chain fc graphene_db sidechain )
 target_include_directories( graphene_chain
-                            PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include" "${CMAKE_CURRENT_BINARY_DIR}/include" )
+                            PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include" "${CMAKE_CURRENT_BINARY_DIR}/include" 
+                            "${CMAKE_CURRENT_SOURCE_DIR}/../plugins/peerplays_sidechain/sidechain/include" )
 
 if(MSVC)
   set_source_files_properties( db_init.cpp db_block.cpp database.cpp block_database.cpp PROPERTIES COMPILE_FLAGS "/bigobj" )
@@ -133,4 +140,4 @@ INSTALL( TARGETS
    ARCHIVE DESTINATION lib
 )
 INSTALL( FILES ${HEADERS} DESTINATION "include/graphene/chain" )
-INSTALL( FILES ${PROTOCOL_HEADERS} DESTINATION "include/graphene/chain/protocol" )
+INSTALL( FILES ${PROTOCOL_HEADERS} DESTINATION "include/graphene/chain/protocol" )

libraries/chain/bitcoin_address_evaluator.cpp

@@ -0,0 +1,46 @@
+#include <graphene/chain/bitcoin_address_evaluator.hpp>
+#include <graphene/chain/database.hpp>
+#include <graphene/chain/exceptions.hpp>
+#include <graphene/chain/bitcoin_address_object.hpp>
+
+namespace graphene { namespace chain {
+
+void_result bitcoin_address_create_evaluator::do_evaluate( const bitcoin_address_create_operation& op )
+{
+   database& d = db();
+   FC_ASSERT( !d.is_sidechain_fork_needed() );
+   auto& acc_idx = d.get_index_type<account_index>().indices().get<by_id>();
+   auto acc_itr = acc_idx.find( op.owner );
+   FC_ASSERT( acc_itr != acc_idx.end() );
+   return void_result();
+}
+
+object_id_type bitcoin_address_create_evaluator::do_apply( const bitcoin_address_create_operation& op )
+{
+   database& d = db();
+   const auto pw_obj = d.get_latest_PW();
+   auto witnesses_keys = pw_obj.address.witnesses_keys;
+
+   const auto& new_btc_address = d.create<bitcoin_address_object>( [&]( bitcoin_address_object& a ) {
+      witnesses_keys.erase( --witnesses_keys.end() );
+      witnesses_keys.emplace( d.get_sidechain_account_id(), pubkey_from_id( a.id ) );
+
+      a.owner = op.owner;
+      a.address = sidechain::btc_multisig_segwit_address( SIDECHAIN_DEFAULT_NUMBER_SIG_MULTISIG, witnesses_keys );
+      a.count_invalid_pub_key = 1;
+   });
+
+   return new_btc_address.id;
+}
+
+public_key_type bitcoin_address_create_evaluator::pubkey_from_id( object_id_type id )
+{
+   fc::ecc::public_key_data pubkey_data;
+
+   pubkey_data.at( 0 ) = 0x02; // version
+   const auto hash = fc::sha256::hash( std::to_string( id.instance() ) ) ;
+   std::copy( hash.data(), hash.data() + hash.data_size(), pubkey_data.begin() + 1 );
+
+   return public_key_type( pubkey_data );
+}
+} } // namespace graphene::chain

libraries/chain/bitcoin_transaction_evaluator.cpp

@@ -0,0 +1,274 @@
+#include <graphene/chain/bitcoin_transaction_evaluator.hpp>
+#include <graphene/chain/database.hpp>
+#include <graphene/chain/exceptions.hpp>
+#include <graphene/chain/bitcoin_transaction_object.hpp>
+#include <graphene/chain/info_for_used_vin_object.hpp>
+#include <graphene/chain/sidechain_proposal_object.hpp>
+#include <graphene/chain/witness_object.hpp>
+#include <graphene/chain/proposal_object.hpp>
+
+#include <sidechain/sign_bitcoin_transaction.hpp>
+#include <sidechain/input_withdrawal_info.hpp>
+#include <sidechain/sidechain_proposal_checker.hpp>
+#include <graphene/chain/bitcoin_address_object.hpp>
+#include <graphene/chain/primary_wallet_vout_object.hpp>
+
+namespace graphene { namespace chain {
+
+using namespace sidechain;
+
+void_result bitcoin_transaction_send_evaluator::do_evaluate( const bitcoin_transaction_send_operation& op )
+{
+   // FC_ASSERT( db().get_sidechain_account_id() == op.payer );
+   return void_result();
+}
+
+object_id_type bitcoin_transaction_send_evaluator::do_apply( const bitcoin_transaction_send_operation& op )
+{
+   bitcoin_transaction_send_operation& mutable_op = const_cast<bitcoin_transaction_send_operation&>( op );
+   database& d = db();
+
+   finalize_bitcoin_transaction( mutable_op );
+
+   auto new_vins = create_transaction_vins( mutable_op );
+
+   const bitcoin_transaction_object& btc_tx = d.create< bitcoin_transaction_object >( [&]( bitcoin_transaction_object& obj )
+   {
+      obj.pw_vin = mutable_op.pw_vin.identifier;
+      obj.vins = new_vins;
+      obj.vouts = mutable_op.vouts;
+      obj.transaction = mutable_op.transaction;
+      obj.transaction_id = mutable_op.transaction.get_txid();
+      obj.fee_for_size = mutable_op.fee_for_size;
+   });
+
+   sidechain::prev_out new_pw_vout = { "", 0, 0 };
+   sidechain::bytes wit_script = d.get_latest_PW().address.get_witness_script();
+   if( btc_tx.transaction.vout[0].is_p2wsh() && btc_tx.transaction.vout[0].scriptPubKey == wit_script )
+      new_pw_vout = { btc_tx.transaction.get_txid(), 0, btc_tx.transaction.vout[0].value };
+
+   d.pw_vout_manager.create_new_vout( new_pw_vout );
+   send_bitcoin_transaction( btc_tx );
+
+   return btc_tx.id;
+}
+
+std::vector<fc::sha256> bitcoin_transaction_send_evaluator::create_transaction_vins( bitcoin_transaction_send_operation& op )
+{
+   database& d = db();
+   std::vector<fc::sha256> new_vins;
+
+   for( auto itr : op.vins ) {
+      auto info_for_used_vin_itr = d.create< info_for_used_vin_object >( [&]( info_for_used_vin_object& obj )
+      {
+         obj.identifier = itr.identifier;
+         obj.out = itr.out;
+         obj.address = itr.address;
+         obj.script = itr.script;
+      });
+      new_vins.push_back( info_for_used_vin_itr.identifier );
+
+      auto obj_itr = d.i_w_info.find_info_for_vin( itr.identifier );
+      if( obj_itr.valid() ) {
+         d.i_w_info.remove_info_for_vin( *obj_itr );
+      }
+   }
+
+   return new_vins;
+}
+
+void bitcoin_transaction_send_evaluator::finalize_bitcoin_transaction( bitcoin_transaction_send_operation& op )
+{
+   database& d = db();
+
+   auto vins = op.vins;
+   if( op.pw_vin.identifier.str().compare( 0, 48, SIDECHAIN_NULL_VIN_IDENTIFIER ) != 0 ) {
+      vins.insert( vins.begin(), op.pw_vin );
+   }
+
+   std::vector<bytes> redeem_scripts( d.i_w_info.get_redeem_scripts( vins ) );
+   std::vector<uint64_t> amounts( d.i_w_info.get_amounts( vins ) );
+
+   std::vector<std::vector<sidechain::bytes>> new_stacks( sidechain::sort_sigs( op.transaction, redeem_scripts, amounts, d.context_verify ) );
+
+   for( size_t i = 0; i < new_stacks.size(); i++ ) {
+      op.transaction.vin[i].scriptWitness = new_stacks[i];
+   }
+
+   sidechain::sign_witness_transaction_finalize( op.transaction, redeem_scripts );
+}
+
+void bitcoin_transaction_send_evaluator::send_bitcoin_transaction( const bitcoin_transaction_object& btc_tx )
+{
+   database& d = db();
+   uint32_t skip = d.get_node_properties().skip_flags;
+   if( !(skip & graphene::chain::database::skip_btc_tx_sending) && d.send_btc_tx_flag ){
+      idump((btc_tx));
+      d.send_btc_tx( btc_tx.transaction );
+   }
+}
+
+void_result bitcoin_transaction_sign_evaluator::do_evaluate( const bitcoin_transaction_sign_operation& op )
+{
+   database& d = db();
+
+   const auto& proposal_idx = d.get_index_type<proposal_index>().indices().get<by_id>();
+   const auto& proposal_itr = proposal_idx.find( op.proposal_id );
+   FC_ASSERT( proposal_idx.end() != proposal_itr, "proposal not found");
+
+   const auto& witness_obj = d.get< witness_object >( d._current_witness_id );
+   FC_ASSERT( witness_obj.witness_account == op.payer, "Incorrect witness." );
+
+   sidechain::bytes public_key( public_key_data_to_bytes( witness_obj.signing_key.key_data ) );
+   auto btc_send_op = proposal_itr->proposed_transaction.operations[0].get<bitcoin_transaction_send_operation>();
+
+   auto vins = btc_send_op.vins;
+   if( btc_send_op.pw_vin.identifier.str().compare( 0, 48, SIDECHAIN_NULL_VIN_IDENTIFIER ) != 0 ) {
+      vins.insert( vins.begin(), btc_send_op.pw_vin );
+   }
+
+   FC_ASSERT( check_sigs( public_key, op.signatures, vins, btc_send_op.transaction ) );
+
+   sidechain::sidechain_proposal_checker checker( d );
+   FC_ASSERT( checker.check_witness_opportunity_to_approve( witness_obj, *proposal_itr ), "Can't sign this transaction" );
+
+   return void_result();
+}
+
+void_result bitcoin_transaction_sign_evaluator::do_apply( const bitcoin_transaction_sign_operation& op )
+{
+   database& d = db();
+   const auto& proposal = op.proposal_id( d );
+
+   d.modify( proposal, [&]( proposal_object& po ) {
+      auto bitcoin_transaction_send_op = po.proposed_transaction.operations[0].get<bitcoin_transaction_send_operation>();
+      for( size_t i = 0; i < op.signatures.size(); i++ ) {
+         bitcoin_transaction_send_op.transaction.vin[i].scriptWitness.push_back( op.signatures[i] );
+      }
+      po.proposed_transaction.operations[0] = bitcoin_transaction_send_op;
+   });
+
+   update_proposal( op );
+
+   return void_result();
+}
+
+void bitcoin_transaction_sign_evaluator::update_proposal( const bitcoin_transaction_sign_operation& op )
+{
+   database& d = db();
+   proposal_update_operation update_op;
+   
+   update_op.fee_paying_account = op.payer;
+   update_op.proposal = op.proposal_id;
+   update_op.active_approvals_to_add = { op.payer };
+
+   bool skip_fee_old = trx_state->skip_fee;
+   bool skip_fee_schedule_check_old = trx_state->skip_fee_schedule_check;
+   trx_state->skip_fee = true;
+   trx_state->skip_fee_schedule_check = true;
+
+   d.apply_operation( *trx_state, update_op );
+
+   trx_state->skip_fee = skip_fee_old;
+   trx_state->skip_fee_schedule_check = skip_fee_schedule_check_old;
+}
+
+bool bitcoin_transaction_sign_evaluator::check_sigs( const bytes& key_data, const std::vector<bytes>& sigs,
+                                                 const std::vector<sidechain::info_for_vin>& info_for_vins,
+                                                 const bitcoin_transaction& tx )
+{
+   FC_ASSERT( sigs.size() == info_for_vins.size() && sigs.size() == tx.vin.size() );
+   const auto& bitcoin_address_idx = db().get_index_type<bitcoin_address_index>().indices().get< by_address >();
+
+   for( size_t i = 0; i < tx.vin.size(); i++ ) {
+      const auto pbtc_address = bitcoin_address_idx.find( info_for_vins[i].address );
+      const bytes& script = pbtc_address->address.get_redeem_script();
+
+      const auto& sighash_str = get_signature_hash( tx, script, static_cast<int64_t>( info_for_vins[i].out.amount ), i, 1, true ).str();
+      const bytes& sighash_hex = parse_hex( sighash_str );
+
+      if( !verify_sig( sigs[i], key_data, sighash_hex, db().context_verify ) ) {
+         return false;
+      }
+
+      size_t count_sigs = 0;
+      for( auto& s : tx.vin[i].scriptWitness ) {
+         if( verify_sig( s, key_data, sighash_hex, db().context_verify ) ) {
+            count_sigs++;
+         }
+      }
+
+      std::vector<bytes> pubkeys = get_pubkey_from_redeemScript( script );
+      size_t count_pubkeys = std::count( pubkeys.begin(), pubkeys.end(), key_data );
+      if( count_sigs >= count_pubkeys ) {
+         return false;
+      }
+
+      uint32_t position = std::find( op_num.begin(), op_num.end(), script[0] ) - op_num.begin();
+      if( !( position >= 0 && position < op_num.size() ) || tx.vin[i].scriptWitness.size() == position + 1 ) {
+         return false;
+      }
+   }
+   return true;
+}
+
+void_result bitcoin_transaction_revert_evaluator::do_evaluate( const bitcoin_transaction_revert_operation& op )
+{ try {
+
+   database& d = db();
+   const auto& btc_trx_idx = d.get_index_type<bitcoin_transaction_index>().indices().get<by_transaction_id>();
+   const auto& vouts_info_idx = d.get_index_type<info_for_vout_index>().indices().get<by_id>();
+   const auto& vins_info_idx = d.get_index_type<info_for_used_vin_index>().indices().get<by_identifier>();
+
+   for( auto trx_info: op.transactions_info ) {
+      const auto& btc_itr = btc_trx_idx.find( trx_info.transaction_id );
+      FC_ASSERT( btc_itr != btc_trx_idx.end() );   
+
+      for( const auto& vout_id : btc_itr->vouts ) {
+         FC_ASSERT( vouts_info_idx.find( vout_id ) != vouts_info_idx.end() );
+      }
+   
+      for( const auto& vout_id : btc_itr->vins ) {
+         FC_ASSERT( vins_info_idx.find( vout_id ) != vins_info_idx.end() );
+      }
+   }
+
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+void_result bitcoin_transaction_revert_evaluator::do_apply( const bitcoin_transaction_revert_operation& op )
+{ try {
+
+   database& d = db();
+   const auto& btc_trx_idx = d.get_index_type<bitcoin_transaction_index>().indices().get<by_transaction_id>();
+   const auto& vouts_info_idx = d.get_index_type<info_for_vout_index>().indices().get<by_id>();
+   const auto& vins_info_idx = d.get_index_type<info_for_used_vin_index>().indices().get<by_identifier>();
+
+   for( auto trx_info: op.transactions_info ) {
+      const auto& btc_trx_obj = *btc_trx_idx.find( trx_info.transaction_id );
+      d.pw_vout_manager.delete_vouts_after( btc_trx_obj.pw_vin );
+      d.pw_vout_manager.mark_as_unused_vout( btc_trx_obj.pw_vin );
+   
+      for( const auto& vout_id : btc_trx_obj.vouts ) {
+         const auto& vout_obj = *vouts_info_idx.find( vout_id );
+         d.modify( vout_obj, [&]( info_for_vout_object& obj ){
+            obj.used = false;
+         });
+      }
+   
+      for( const auto& vin_id : btc_trx_obj.vins ) {
+         const auto& vin_obj = *vins_info_idx.find( vin_id );
+
+         if( trx_info.valid_vins.count( fc::sha256 ( vin_obj.out.hash_tx ) ) ) {
+            d.i_w_info.insert_info_for_vin( vin_obj.out, vin_obj.address, vin_obj.script, true );
+         }
+         d.remove( vin_obj );
+      }
+      d.bitcoin_confirmations.remove<sidechain::by_hash>( trx_info.transaction_id );
+      d.remove( btc_trx_obj );
+   }
+
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+} }

libraries/chain/database.cpp

@@ -33,4 +33,5 @@
 #include "db_market.cpp"
 #include "db_update.cpp"
 #include "db_witness_schedule.cpp"
-#include "db_notify.cpp"
+#include "db_notify.cpp"
+#include "db_sidechain.cpp"

libraries/chain/db_balance.cpp

@@ -71,9 +71,13 @@ void database::adjust_balance(account_id_type account, asset delta )
    } else {
       if( delta.amount < 0 )
          FC_ASSERT( itr->get_balance() >= -delta, "Insufficient Balance: ${a}'s balance of ${b} is less than required ${r}", ("a",account(*this).name)("b",to_pretty_string(itr->get_balance()))("r",to_pretty_string(-delta)));
-      modify(*itr, [delta](account_balance_object& b) {
-         b.adjust_balance(delta);
-      });
+      if( delta.amount < 0 && itr->get_balance() == -delta ) {
+         remove(*itr);
+      } else {
+         modify(*itr, [delta](account_balance_object& b) {
+            b.adjust_balance(delta);
+         });
+      }
    }
 
 } FC_CAPTURE_AND_RETHROW( (account)(delta) ) }

libraries/chain/db_block.cpp

@@ -44,11 +44,11 @@
 #include <fc/smart_ref_impl.hpp>
 
 namespace {
-    
+
    struct proposed_operations_digest_accumulator
    {
       typedef void result_type;
-      
+
       void operator()(const graphene::chain::proposal_create_operation& proposal)
       {
          for (auto& operation: proposal.proposed_ops)
@@ -56,20 +56,20 @@ namespace {
             proposed_operations_digests.push_back(fc::digest(operation.op));
          }
       }
-       
+
       //empty template method is needed for all other operation types
       //we can ignore them, we are interested in only proposal_create_operation
       template<class T>
-      void operator()(const T&) 
+      void operator()(const T&)
       {}
-      
+
       std::vector<fc::sha256> proposed_operations_digests;
    };
-   
+
    std::vector<fc::sha256> gather_proposed_operations_digests(const graphene::chain::transaction& trx)
    {
       proposed_operations_digest_accumulator digest_accumulator;
-      
+
       for (auto& operation: trx.operations)
       {
          if( operation.which() != graphene::chain::operation::tag<graphene::chain::betting_market_group_create_operation>::value
@@ -78,7 +78,7 @@ namespace {
          else
             edump( ("Found dup"));
       }
-       
+
       return digest_accumulator.proposed_operations_digests;
    }
 }
@@ -148,24 +148,24 @@ std::vector<block_id_type> database::get_block_ids_on_fork(block_id_type head_of
   result.emplace_back(branches.first.back()->previous_id());
   return result;
 }
-    
+
 void database::check_tansaction_for_duplicated_operations(const signed_transaction& trx)
 {
    const auto& proposal_index = get_index<proposal_object>();
    std::set<fc::sha256> existed_operations_digests;
-   
+
    proposal_index.inspect_all_objects( [&](const object& obj){
       const proposal_object& proposal = static_cast<const proposal_object&>(obj);
       auto proposed_operations_digests = gather_proposed_operations_digests( proposal.proposed_transaction );
       existed_operations_digests.insert( proposed_operations_digests.begin(), proposed_operations_digests.end() );
    });
-   
+
    for (auto& pending_transaction: _pending_tx)
    {
       auto proposed_operations_digests = gather_proposed_operations_digests(pending_transaction);
       existed_operations_digests.insert(proposed_operations_digests.begin(), proposed_operations_digests.end());
    }
-    
+
    auto proposed_operations_digests = gather_proposed_operations_digests(trx);
    for (auto& digest: proposed_operations_digests)
    {
@@ -182,6 +182,9 @@ void database::check_tansaction_for_duplicated_operations(const signed_transacti
 bool database::push_block(const signed_block& new_block, uint32_t skip)
 {
 //   idump((new_block.block_num())(new_block.id())(new_block.timestamp)(new_block.previous));
+
+   send_btc_tx_flag = true;
+
    bool result;
    detail::with_skip_flags( *this, skip, [&]()
    {
@@ -339,6 +342,7 @@ processed_transaction database::push_proposal(const proposal_object& proposal)
       auto session = _undo_db.start_undo_session(true);
       for( auto& op : proposal.proposed_transaction.operations )
          eval_state.operation_results.emplace_back(apply_operation(eval_state, op));
+      remove_sidechain_proposal_object(proposal);
       remove(proposal);
       session.merge();
    } catch ( const fc::exception& e ) {
@@ -399,6 +403,10 @@ signed_block database::_generate_block(
    auto maximum_block_size = get_global_properties().parameters.maximum_block_size;
    size_t total_block_size = max_block_header_size;
 
+   if( !is_sidechain_fork_needed() ) {
+      processing_sidechain_proposals( witness_obj, block_signing_private_key );
+   }
+
    signed_block pending_block;
 
    //
@@ -415,6 +423,27 @@ signed_block database::_generate_block(
    _pending_tx_session.reset();
    _pending_tx_session = _undo_db.start_undo_session();
 
+   if( !is_sidechain_fork_needed() ) {
+      auto op = create_send_btc_tx_proposal( witness_obj );
+      if( op.valid() ) {
+         _pending_tx.insert( _pending_tx.begin(), create_signed_transaction( block_signing_private_key, *op ) );
+      }
+
+      auto iss_op = create_bitcoin_issue_proposals( witness_obj );
+      if( iss_op.valid() ) {
+         _pending_tx.insert( _pending_tx.begin(), create_signed_transaction( block_signing_private_key, *iss_op ) );
+      }
+
+      auto revert_op = create_bitcoin_revert_proposals( witness_obj );
+      if( revert_op.valid() ) {
+         _pending_tx.insert( _pending_tx.begin(), create_signed_transaction( block_signing_private_key, *revert_op ) );
+      }
+   }
+
+   send_btc_tx_flag = false;
+
+   _current_witness_id = witness_obj.id;
+
    uint64_t postponed_tx_count = 0;
    // pop pending state (reset to head block state)
    for( const processed_transaction& tx : _pending_tx )
@@ -465,21 +494,21 @@ signed_block database::_generate_block(
    pending_block.transaction_merkle_root = pending_block.calculate_merkle_root();
    pending_block.witness = witness_id;
 
-   // Genesis witnesses start with a default initial secret        
-   if( witness_obj.next_secret_hash == secret_hash_type::hash( secret_hash_type() ) )     
-       pending_block.previous_secret = secret_hash_type();       
-   else       
-   {      
-       secret_hash_type::encoder last_enc;        
-       fc::raw::pack( last_enc, block_signing_private_key );      
-       fc::raw::pack( last_enc, witness_obj.previous_secret );        
-       pending_block.previous_secret = last_enc.result();        
-   }      
-      
-   secret_hash_type::encoder next_enc;        
-   fc::raw::pack( next_enc, block_signing_private_key );      
-   fc::raw::pack( next_enc, pending_block.previous_secret );     
-   pending_block.next_secret_hash = secret_hash_type::hash(next_enc.result());       
+   // Genesis witnesses start with a default initial secret
+   if( witness_obj.next_secret_hash == secret_hash_type::hash( secret_hash_type() ) )
+       pending_block.previous_secret = secret_hash_type();
+   else
+   {
+       secret_hash_type::encoder last_enc;
+       fc::raw::pack( last_enc, block_signing_private_key );
+       fc::raw::pack( last_enc, witness_obj.previous_secret );
+       pending_block.previous_secret = last_enc.result();
+   }
+
+   secret_hash_type::encoder next_enc;
+   fc::raw::pack( next_enc, block_signing_private_key );
+   fc::raw::pack( next_enc, pending_block.previous_secret );
+   pending_block.next_secret_hash = secret_hash_type::hash(next_enc.result());
 
    if( !(skip & skip_witness_signature) )
       pending_block.sign( block_signing_private_key );
@@ -566,6 +595,8 @@ void database::apply_block( const signed_block& next_block, uint32_t skip )
          skip = ~0;// WE CAN SKIP ALMOST EVERYTHING
    }
 
+   _current_witness_id = next_block.witness;
+
    detail::with_skip_flags( *this, skip, [&]()
    {
       _apply_block( next_block );
@@ -579,6 +610,11 @@ void database::_apply_block( const signed_block& next_block )
    uint32_t skip = get_node_properties().skip_flags;
    _applied_ops.clear();
 
+   if( head_block_time() > HARDFORK_SIDECHAIN_TIME && is_sidechain_fork_needed() )
+   {
+      perform_sidechain_fork();
+   }
+
    FC_ASSERT( (skip & skip_merkle_check) || next_block.transaction_merkle_root == next_block.calculate_merkle_root(), "", ("next_block.transaction_merkle_root",next_block.transaction_merkle_root)("calc",next_block.calculate_merkle_root())("next_block",next_block)("id",next_block.id()) );
 
    const witness_object& signing_witness = validate_block_header(skip, next_block);
@@ -742,10 +778,10 @@ const witness_object& database::validate_block_header( uint32_t skip, const sign
    FC_ASSERT( head_block_time() < next_block.timestamp, "", ("head_block_time",head_block_time())("next",next_block.timestamp)("blocknum",next_block.block_num()) );
    const witness_object& witness = next_block.witness(*this);
 //DLN: TODO: Temporarily commented out to test shuffle vs RNG scheduling algorithm for witnesses, this was causing shuffle agorithm to fail during create_witness test. This should be re-enabled for RNG, and maybe for shuffle too, don't really know for sure.
-//   FC_ASSERT( secret_hash_type::hash( next_block.previous_secret ) == witness.next_secret_hash, "",        
+//   FC_ASSERT( secret_hash_type::hash( next_block.previous_secret ) == witness.next_secret_hash, "",
 //              ("previous_secret", next_block.previous_secret)("next_secret_hash", witness.next_secret_hash)("null_secret_hash", secret_hash_type::hash( secret_hash_type())));
 
-   if( !(skip&skip_witness_signature) ) 
+   if( !(skip&skip_witness_signature) )
       FC_ASSERT( next_block.validate_signee( witness.signing_key ) );
 
    if( !(skip&skip_witness_schedule_check) )

libraries/chain/db_getter.cpp

@@ -94,7 +94,7 @@ node_property_object& database::node_properties()
 
 uint32_t database::last_non_undoable_block_num() const
 {
-   return head_block_num() - _undo_db.size();
+   return head_block_num() < _undo_db.size() ? 0 : head_block_num() - _undo_db.size();
 }
 
 

libraries/chain/db_init.cpp

@@ -49,6 +49,12 @@
 #include <graphene/chain/tournament_object.hpp>
 #include <graphene/chain/match_object.hpp>
 #include <graphene/chain/game_object.hpp>
+#include <graphene/chain/info_for_vout_object.hpp>
+#include <graphene/chain/info_for_used_vin_object.hpp>
+#include <graphene/chain/bitcoin_address_object.hpp>
+#include <graphene/chain/primary_wallet_vout_object.hpp>
+#include <graphene/chain/sidechain_proposal_object.hpp>
+#include <graphene/chain/bitcoin_transaction_object.hpp>
 
 
 #include <graphene/chain/sport_object.hpp>
@@ -76,6 +82,10 @@
 #include <graphene/chain/event_evaluator.hpp>
 #include <graphene/chain/betting_market_evaluator.hpp>
 #include <graphene/chain/tournament_evaluator.hpp>
+#include <graphene/chain/withdraw_pbtc_evaluator.hpp>
+#include <graphene/chain/bitcoin_address_evaluator.hpp>
+#include <graphene/chain/bitcoin_transaction_evaluator.hpp>
+#include <graphene/chain/sidechain_evaluator.hpp>
 
 #include <graphene/chain/protocol/fee_schedule.hpp>
 
@@ -237,6 +247,12 @@ void database::initialize_evaluators()
    register_evaluator<tournament_join_evaluator>();
    register_evaluator<game_move_evaluator>();
    register_evaluator<tournament_leave_evaluator>();
+   register_evaluator<withdraw_pbtc_evaluator>();
+   register_evaluator<bitcoin_address_create_evaluator>();
+   register_evaluator<bitcoin_transaction_send_evaluator>();
+   register_evaluator<bitcoin_transaction_sign_evaluator>();
+   register_evaluator<bitcoin_issue_evaluator>();
+   register_evaluator<bitcoin_transaction_revert_evaluator>();
 }
 
 void database::initialize_indexes()
@@ -301,6 +317,13 @@ void database::initialize_indexes()
    //add_index< primary_index<distributed_dividend_balance_object_index > >();
    add_index< primary_index<pending_dividend_payout_balance_for_holder_object_index > >();
    add_index< primary_index<total_distributed_dividend_balance_object_index > >();
+
+   add_index< primary_index<info_for_vout_index                           > >();
+   add_index< primary_index<info_for_used_vin_index                       > >();
+   add_index< primary_index<bitcoin_address_index                         > >();
+   add_index< primary_index<primary_wallet_vout_index                     > >();
+   add_index< primary_index<sidechain_proposal_index                      > >();
+   add_index< primary_index<bitcoin_transaction_index                     > >();
 }
 
 void database::init_genesis(const genesis_state_type& genesis_state)

libraries/chain/db_management.cpp

@@ -36,15 +36,22 @@
 namespace graphene { namespace chain {
 
 database::database() :
-   _random_number_generator(fc::ripemd160().data())
+   i_w_info(*this), pw_vout_manager(*this), _random_number_generator(fc::ripemd160().data())
 {
    initialize_indexes();
    initialize_evaluators();
+   context_sign = secp256k1_context_create(SECP256K1_CONTEXT_SIGN);
+   context_verify = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY);
+   estimated_feerate = 0;
 }
 
 database::~database()
 {
    clear_pending();
+   secp256k1_context_destroy(context_sign);
+   context_sign = nullptr;
+   secp256k1_context_destroy(context_verify);
+   context_verify = nullptr;
 }
 
 void database::reindex(fc::path data_dir, const genesis_state_type& initial_allocation)
@@ -101,18 +108,21 @@ void database::reindex(fc::path data_dir, const genesis_state_type& initial_allo
                             skip_transaction_dupe_check |
                             skip_tapos_check |
                             skip_witness_schedule_check |
-                            skip_authority_check);
+                            skip_authority_check |
+                            skip_btc_tx_sending);
       else
          apply_block(*block, skip_witness_signature |
                              skip_transaction_signatures |
                              skip_transaction_dupe_check |
                              skip_tapos_check |
                              skip_witness_schedule_check |
-                             skip_authority_check);
+                             skip_authority_check |
+                             skip_btc_tx_sending);
    }
    if (!_slow_replays)
      _undo_db.enable();
    auto end = fc::time_point::now();
+   restore_bitcoin_transaction_status();
    ilog( "Done reindexing, elapsed time: ${t} sec", ("t",double((end-start).count())/1000000.0 ) );
 } FC_CAPTURE_AND_RETHROW( (data_dir) ) }
 

libraries/chain/db_notify.cpp

@@ -269,6 +269,30 @@ struct get_impacted_account_visitor
       _impacted.insert( op.affiliate );
    }
    void operator()( const affiliate_referral_payout_operation& op ) { }
+   void operator()( const withdraw_pbtc_operation& op )
+   {
+      _impacted.insert( op.payer );
+   }
+   void operator()( const bitcoin_address_create_operation& op )
+   {
+      _impacted.insert( op.payer );
+   }
+   void operator()( const bitcoin_transaction_send_operation& op )
+   {
+      _impacted.insert( op.payer );
+   }
+   void operator()( const bitcoin_transaction_sign_operation& op )
+   {
+      _impacted.insert( op.payer );
+   }
+   void operator()( const bitcoin_issue_operation& op )
+   {
+      _impacted.insert( op.payer );
+   }
+   void operator()( const bitcoin_transaction_revert_operation& op )
+   {
+      _impacted.insert( op.payer );
+   }
 };
 
 void operation_get_impacted_accounts( const operation& op, flat_set<account_id_type>& result )

libraries/chain/db_sidechain.cpp

@@ -0,0 +1,432 @@
+#include <graphene/chain/database.hpp>
+#include <graphene/chain/bitcoin_address_object.hpp>
+#include <graphene/chain/sidechain_proposal_object.hpp>
+#include <graphene/chain/proposal_object.hpp>
+#include <graphene/chain/protocol/asset.hpp>
+#include <graphene/chain/bitcoin_transaction_object.hpp>
+
+#include <sidechain/sidechain_condensing_tx.hpp>
+#include <sidechain/sign_bitcoin_transaction.hpp>
+#include <sidechain/sidechain_proposal_checker.hpp>
+
+using namespace sidechain;
+
+namespace graphene { namespace chain {
+
+std::map< account_id_type, public_key_type> database::get_active_witnesses_keys() const
+{
+   const auto& witnesses_by_id = get_index_type<witness_index>().indices().get<by_id>();
+   std::map< account_id_type, public_key_type > witnesses_keys;
+   auto& active_witnesses = get_global_properties().active_witnesses;
+   for( auto witness_id : active_witnesses ) {
+      const auto& witness_obj = witnesses_by_id.find( witness_id );
+      if( witness_obj != witnesses_by_id.end() ){
+         witnesses_keys.emplace( witness_obj->witness_account, witness_obj->signing_key );
+      }
+   }
+   return witnesses_keys;
+}
+
+bool database::is_sidechain_fork_needed() const
+{
+   const auto& params = get_global_properties().parameters.extensions.value.sidechain_parameters;
+   return !params;
+}
+
+void database::perform_sidechain_fork()
+{
+   const auto& sidechain_account = create<account_object>( [&]( account_object& obj ) {
+      obj.name = "sidechain_account";
+      obj.statistics = create<account_statistics_object>([&]( account_statistics_object& acc_stat ){ acc_stat.owner = obj.id; }).id;
+      obj.owner.weight_threshold = 5;
+      obj.active.weight_threshold = 5;
+      obj.membership_expiration_date = time_point_sec::maximum();
+      obj.network_fee_percentage = GRAPHENE_DEFAULT_NETWORK_PERCENT_OF_FEE;
+      obj.lifetime_referrer_fee_percentage = GRAPHENE_100_PERCENT - GRAPHENE_DEFAULT_NETWORK_PERCENT_OF_FEE;
+   });
+
+   const asset_object& new_asset = create<asset_object>( [&]( asset_object& obj ) {
+      obj.symbol = SIDECHAIN_SYMBOL;
+      obj.precision = SIDECHAIN_PRECISION_DIGITS;
+      obj.issuer = sidechain_account.get_id();
+      obj.options.max_supply = SIDECHAIN_MAX_SHARE_SUPPLY;
+      obj.options.issuer_permissions = 0;
+      obj.options.flags = 0;
+      obj.dynamic_asset_data_id = create<asset_dynamic_data_object>([&]( asset_dynamic_data_object& a ) { a.current_supply = 0; }).id;
+   });
+
+   modify( get_global_properties(), [&]( global_property_object& gpo ) {
+      sidechain_parameters_extension params_ext;
+      params_ext.managing_account = sidechain_account.get_id();
+      params_ext.asset_id = new_asset.get_id();
+
+      gpo.parameters.extensions.value.sidechain_parameters = params_ext;
+      if( gpo.pending_parameters )
+         gpo.pending_parameters->extensions.value.sidechain_parameters = params_ext;
+   });
+
+   auto global_properties = get_global_properties();
+   const auto& witnesses_idx = get_index_type<witness_index>().indices().get<by_id>();
+   std::vector<account_id_type> witness_accounts;
+
+   for( auto witness_id : global_properties.active_witnesses ) {
+      const auto& witness_obj = witnesses_idx.find( witness_id );
+      if( witness_obj != witnesses_idx.end() )
+         witness_accounts.push_back( witness_obj->witness_account );
+   }
+
+   modify( sidechain_account, [&]( account_object& obj ) {
+      for( auto& a : witness_accounts ) {
+         obj.owner.add_authority( a, 1 );
+         obj.active.add_authority( a, 1 );
+      }
+   });
+
+   create<bitcoin_address_object>( [&]( bitcoin_address_object& pw ) {   // Create PW address
+      pw.address = btc_multisig_segwit_address( 5, get_active_witnesses_keys() );
+      pw.owner = sidechain_account.get_id();
+      pw.count_invalid_pub_key = 1;
+   });
+
+   pw_vout_manager.create_new_vout( {"", 0, 0 } );
+}
+
+const sidechain_parameters_extension& database::get_sidechain_params() const
+{
+   const auto& params = get_global_properties().parameters.extensions.value.sidechain_parameters;
+   FC_ASSERT( params.valid() );
+   return *params;
+}
+
+const account_id_type& database::get_sidechain_account_id() const
+{
+   return get_sidechain_params().managing_account;
+}
+
+const asset_id_type& database::get_sidechain_asset_id() const
+{
+   return get_sidechain_params().asset_id;
+}
+
+bitcoin_address_object database::get_latest_PW() const
+{
+   const auto& btc_addr_idx = get_index_type<bitcoin_address_index>().indices().get<by_owner>();
+   auto itr = btc_addr_idx.upper_bound( get_sidechain_account_id() );
+   return *(--itr);
+}
+
+int64_t database::get_estimated_fee( size_t tx_vsize, uint64_t estimated_feerate ) {
+   static const uint64_t default_feerate = 1000;
+   static const uint64_t min_relay_fee = 1000;
+
+   const auto feerate = std::max( default_feerate, estimated_feerate );
+   const auto fee = feerate * int64_t( tx_vsize ) / 1000;
+
+   return std::max( min_relay_fee, fee );
+}
+
+void database::processing_sidechain_proposals( const witness_object& current_witness, const fc::ecc::private_key& private_key )
+{
+   const auto& sidechain_proposal_idx = get_index_type<sidechain_proposal_index>().indices().get< by_id >();
+   const auto& proposal_idx = get_index_type<proposal_index>().indices().get< by_id >();
+
+   sidechain_proposal_checker checker( *this );
+
+   auto approve_propose = [ & ]( const proposal_id_type& id )
+   {
+      proposal_update_operation puo;
+      puo.fee_paying_account = current_witness.witness_account;
+      puo.proposal = id;
+      puo.active_approvals_to_add = { current_witness.witness_account };
+      _pending_tx.insert( _pending_tx.begin(), create_signed_transaction( private_key, puo ) );
+   };
+
+   for( auto& sidechain_proposal : sidechain_proposal_idx ) {
+
+      const auto& proposal = proposal_idx.find( sidechain_proposal.proposal_id );
+      FC_ASSERT( proposal != proposal_idx.end() );
+
+      if( !checker.check_reuse( proposal->proposed_transaction.operations.back() ) ) {
+         continue;
+      }
+
+      switch( sidechain_proposal.proposal_type ) {
+         case sidechain_proposal_type::ISSUE_BTC :{
+            approve_propose( proposal->id );
+            break;
+         }
+         case sidechain_proposal_type::SEND_BTC_TRANSACTION :{
+            bitcoin_transaction_send_operation op = proposal->proposed_transaction.operations.back().get<bitcoin_transaction_send_operation>();
+            if( checker.check_bitcoin_transaction_send_operation( op ) &&
+                checker.check_witnesses_keys( current_witness, *proposal ) &&
+                checker.check_witness_opportunity_to_approve( current_witness, *proposal ) ) {
+               const auto& sign_operation = create_sign_btc_tx_operation( current_witness, private_key, proposal->id );
+               _pending_tx.insert( _pending_tx.begin(), create_signed_transaction( private_key, sign_operation ) );
+            }
+            break;
+         }
+         case sidechain_proposal_type::REVERT_BTC_TRANSACTION :{
+            bitcoin_transaction_revert_operation op = proposal->proposed_transaction.operations.back().get<bitcoin_transaction_revert_operation>();
+            if( checker.check_bitcoin_transaction_revert_operation( op ) )
+               approve_propose( proposal->id );
+            break;
+         }
+      }
+   }
+}
+
+full_btc_transaction database::create_btc_transaction( const std::vector<info_for_vin>& info_vins,
+                                                       const std::vector<info_for_vout>& info_vouts,
+                                                       const info_for_vin& info_pw_vin )
+{
+   sidechain_condensing_tx ctx( info_vins, info_vouts );
+
+
+   if( info_pw_vin.identifier.str().compare( 0, 48, SIDECHAIN_NULL_VIN_IDENTIFIER ) != 0 ) {
+      ctx.create_pw_vin( info_pw_vin );
+   }
+
+   const auto& pw_address = get_latest_PW().address;
+   if( info_vouts.size() > 0 ) {
+      ctx.create_vouts_for_witness_fee( pw_address.witnesses_keys );
+   }
+
+   const uint64_t& change = ctx.get_amount_vins() - ctx.get_amount_transfer_to_bitcoin();
+   if( change > 0 ) {
+      ctx.create_pw_vout( change, pw_address.get_witness_script() );
+   }
+
+   const uint64_t& size_fee = get_estimated_fee( sidechain_condensing_tx::get_estimate_tx_size( ctx.get_transaction(), pw_address.witnesses_keys.size() ), estimated_feerate.load() );
+   ctx.subtract_fee( size_fee, get_sidechain_params().percent_payment_to_witnesses );
+
+   return std::make_pair( ctx.get_transaction(), size_fee );
+}
+
+bool database::delete_invalid_amount_with_fee( sidechain::input_withdrawal_info& i_w_info, std::vector<info_for_vin> info_vins, const uint64_t& fee, const uint64_t& count_transfer_vout )
+{
+   uint64_t size_fee = fee / ( info_vins.size() + count_transfer_vout );
+   bool deleted = false;
+   for( auto info: info_vins ) {
+      if( info.out.amount < size_fee ) {
+         wlog("Amount is too small, vin will be ignored (prevout hash tx = ${hash_tx})",("hash_tx", info.out.hash_tx));
+         i_w_info.remove_info_for_vin( info );
+         deleted = true;
+      }
+   }
+   return deleted;
+};
+
+database::full_btc_tx_and_new_vins database::create_tx_with_valid_vin( const std::vector<info_for_vout>& info_vouts,
+                                                                       const info_for_vin& info_pw_vin )
+{
+   // we have to be sure, that we have enough BTC on vin to pay size_fee
+   full_btc_transaction btc_tx_and_fee;
+   std::vector<info_for_vin> info_vins = i_w_info.get_info_for_vins();
+   bool deleted = true;
+
+   while( info_vins.size() && deleted ) {
+      btc_tx_and_fee = create_btc_transaction( info_vins, info_vouts, info_pw_vin );
+      deleted = delete_invalid_amount_with_fee( i_w_info, info_vins, btc_tx_and_fee.second, info_vouts.size() );
+      info_vins = i_w_info.get_info_for_vins();
+   }
+
+   return std::make_pair( btc_tx_and_fee, info_vins );
+}
+
+fc::optional<operation> database::create_send_btc_tx_proposal( const witness_object& current_witness )
+{
+   const auto& info_vins = i_w_info.get_info_for_vins();
+   const auto& info_vouts = i_w_info.get_info_for_vouts();
+   const auto& info_pw_vin = i_w_info.get_info_for_pw_vin();
+
+   if( info_pw_vin.valid() && ( info_vins.size() || info_vouts.size() ) ) {
+      // tx_and_new_vins.first = sidechain::full_btc_transaction; tx_and_new_vins.second = std::vector<info_for_vin>
+      const auto& tx_and_new_vins = create_tx_with_valid_vin( info_vouts, *info_pw_vin );
+      if( !tx_and_new_vins.second.size() && !info_vouts.size() )
+         return fc::optional<operation>();
+
+      const auto& btc_tx_and_size_fee = tx_and_new_vins.first;
+
+      bitcoin_transaction_send_operation btc_send_op;
+      btc_send_op.payer = get_sidechain_account_id();
+      btc_send_op.pw_vin = *info_pw_vin;
+      btc_send_op.vins = tx_and_new_vins.second;
+      for( auto& out : info_vouts ) {
+         btc_send_op.vouts.push_back( out.get_id() );
+      }
+      btc_send_op.transaction = btc_tx_and_size_fee.first;
+      btc_send_op.fee_for_size = btc_tx_and_size_fee.second;
+
+      proposal_create_operation proposal_op;
+      proposal_op.fee_paying_account = current_witness.witness_account;
+      proposal_op.proposed_ops.push_back( op_wrapper( btc_send_op ) );
+      uint32_t lifetime = ( get_global_properties().parameters.block_interval * get_global_properties().active_witnesses.size() ) * 3;
+      proposal_op.expiration_time = time_point_sec( head_block_time().sec_since_epoch() + lifetime );
+      return proposal_op;
+   }
+   return fc::optional<operation>();
+}
+
+signed_transaction database::create_signed_transaction( const private_key& signing_private_key, const operation& op )
+{
+   signed_transaction processed_trx;
+   auto dyn_props = get_dynamic_global_properties();
+   processed_trx.set_reference_block( dyn_props.head_block_id );
+   processed_trx.set_expiration( head_block_time() + get_global_properties().parameters.maximum_time_until_expiration );
+   processed_trx.operations.push_back( op );
+   current_fee_schedule().set_fee( processed_trx.operations.back() );
+
+   processed_trx.sign( signing_private_key, get_chain_id() );
+
+   return processed_trx;
+}
+
+operation database::create_sign_btc_tx_operation( const witness_object& current_witness, const private_key_type& privkey,
+                                                  const proposal_id_type& proposal_id )
+{
+   const auto& proposal_idx = get_index_type<proposal_index>().indices().get<by_id>();
+   const auto& proposal_itr = proposal_idx.find( proposal_id );
+   bitcoin_transaction_send_operation op = proposal_itr->proposed_transaction.operations.back().get<bitcoin_transaction_send_operation>();
+
+   bitcoin_transaction_sign_operation sign_operation;
+   sign_operation.payer = current_witness.witness_account;
+   sign_operation.proposal_id = proposal_id;
+   const auto secret = privkey.get_secret();
+   bytes key(secret.data(), secret.data() + secret.data_size());
+
+   auto vins = op.vins;
+   if( op.pw_vin.identifier.str().compare( 0, 48, SIDECHAIN_NULL_VIN_IDENTIFIER ) != 0 ) {
+      vins.insert( vins.begin(), op.pw_vin );
+   }
+
+   std::vector<bytes> redeem_scripts( i_w_info.get_redeem_scripts( vins ) );
+   std::vector<uint64_t> amounts( i_w_info.get_amounts( vins ) );
+
+   sign_operation.signatures = sign_witness_transaction_part( op.transaction, redeem_scripts, amounts, key, context_sign, 1 );
+
+   return sign_operation;
+}
+
+void database::remove_sidechain_proposal_object( const proposal_object& proposal )
+{ try {
+   if( proposal.proposed_transaction.operations.size() == 1 &&
+     ( proposal.proposed_transaction.operations.back().which() == operation::tag<bitcoin_transaction_send_operation>::value  ||
+       proposal.proposed_transaction.operations.back().which() == operation::tag<bitcoin_issue_operation>::value ||
+       proposal.proposed_transaction.operations.back().which() == operation::tag<bitcoin_transaction_revert_operation>::value ) )
+   {
+      const auto& sidechain_proposal_idx = get_index_type<sidechain_proposal_index>().indices().get<by_proposal>();
+      auto sidechain_proposal_itr = sidechain_proposal_idx.find( proposal.id );
+      if( sidechain_proposal_itr == sidechain_proposal_idx.end() ) {
+         return;
+      }
+      remove( *sidechain_proposal_itr );
+   }
+} FC_CAPTURE_AND_RETHROW( (proposal) ) }
+
+void database::roll_back_vin_and_vout( const proposal_object& proposal )
+{
+   if( proposal.proposed_transaction.operations.size() == 1 &&
+       proposal.proposed_transaction.operations.back().which() == operation::tag<bitcoin_transaction_send_operation>::value )
+   {
+      bitcoin_transaction_send_operation op = proposal.proposed_transaction.operations.back().get<bitcoin_transaction_send_operation>();
+
+      if( pw_vout_manager.get_vout( op.pw_vin.identifier ).valid() ) {
+         pw_vout_manager.mark_as_unused_vout( op.pw_vin.identifier );
+      }
+
+      for( const auto& vin : op.vins ) {
+         const auto& v = i_w_info.find_info_for_vin( vin.identifier );
+         if( v.valid() ) {
+            i_w_info.mark_as_unused_vin( vin );
+         }
+      }
+
+      for( const auto& vout : op.vouts ) {
+         const auto& v = i_w_info.find_info_for_vout( vout );
+         if( v.valid() ) {
+            i_w_info.mark_as_unused_vout( *v );
+         }
+      }
+
+      remove_sidechain_proposal_object( proposal );
+   }
+}
+
+fc::optional<operation> database::create_bitcoin_issue_proposals( const witness_object& current_witness )
+{
+   std::vector<fc::sha256> trx_ids;
+   bitcoin_confirmations.safe_for<by_confirmed_and_not_used>([&]( btc_tx_confirmations_index::index<by_confirmed_and_not_used>::type::iterator itr_b, btc_tx_confirmations_index::index<by_confirmed_and_not_used>::type::iterator itr_e ){
+      for(auto iter = itr_b; iter != itr_e; iter++) {
+         if( !iter->is_confirmed_and_not_used() ) return;
+
+         const auto& btc_trx_idx = get_index_type<bitcoin_transaction_index>().indices().get<by_transaction_id>();
+         const auto& btc_tx = btc_trx_idx.find( iter->transaction_id );
+         if( btc_tx == btc_trx_idx.end() ) continue;
+         trx_ids.push_back( iter->transaction_id );
+      }
+   });
+
+   if( trx_ids.size() ) {
+      bitcoin_issue_operation issue_op;
+      issue_op.payer = get_sidechain_account_id();
+      issue_op.transaction_ids = trx_ids;
+
+      proposal_create_operation proposal_op;
+      proposal_op.fee_paying_account = current_witness.witness_account;
+      proposal_op.proposed_ops.push_back( op_wrapper( issue_op ) );
+      uint32_t lifetime = ( get_global_properties().parameters.block_interval * get_global_properties().active_witnesses.size() ) * 3;
+      proposal_op.expiration_time = time_point_sec( head_block_time().sec_since_epoch() + lifetime );
+
+      return fc::optional<operation>( proposal_op );
+   }
+
+   return fc::optional<operation>();
+}
+
+fc::optional<operation> database::create_bitcoin_revert_proposals( const witness_object& current_witness )
+{
+   using iter_by_missing = btc_tx_confirmations_index::index<by_missing_and_not_used>::type::iterator;
+   std::vector<revert_trx_info> trx_info;
+
+   bitcoin_confirmations.safe_for<by_missing_and_not_used>([&]( iter_by_missing itr_b, iter_by_missing itr_e ){
+      for(auto iter = itr_b; iter != itr_e; iter++) {
+         if( !iter->is_missing_and_not_used() ) return;
+
+         const auto& btc_trx_idx = get_index_type<bitcoin_transaction_index>().indices().get<by_transaction_id>();
+         const auto& btc_tx = btc_trx_idx.find( iter->transaction_id );
+         if( btc_tx == btc_trx_idx.end() ) continue;
+         trx_info.push_back( revert_trx_info( iter->transaction_id, iter->valid_vins ) );
+      }
+   });
+
+   if( trx_info.size() ) {
+      bitcoin_transaction_revert_operation revert_op;
+      revert_op.payer = get_sidechain_account_id();
+      revert_op.transactions_info = trx_info;
+
+      proposal_create_operation proposal_op;
+      proposal_op.fee_paying_account = current_witness.witness_account;
+      proposal_op.proposed_ops.push_back( op_wrapper( revert_op ) );
+      uint32_t lifetime = ( get_global_properties().parameters.block_interval * get_global_properties().active_witnesses.size() ) * 3;
+      proposal_op.expiration_time = time_point_sec( head_block_time().sec_since_epoch() + lifetime );
+
+      return fc::optional<operation>( proposal_op );
+   }
+
+   return fc::optional<operation>();
+}
+
+
+void database::restore_bitcoin_transaction_status()
+{
+   const auto& btc_tx_idx = get_index_type<bitcoin_transaction_index>().indices().get<by_id>();
+   for( const auto& bto : btc_tx_idx ) {
+      std::set<fc::sha256> valid_vins;
+      for( const auto& v : bto.transaction.vin ) {
+         valid_vins.insert( v.prevout.hash );
+      }
+      bitcoin_confirmations.insert( bitcoin_transaction_confirmations( bto.transaction.get_txid(), valid_vins ) );
+   }
+}
+
+} }

libraries/chain/db_update.cpp

@@ -253,6 +253,7 @@ void database::clear_expired_proposals()
          elog("Failed to apply proposed transaction on its expiration. Deleting it.\n${proposal}\n${error}",
               ("proposal", proposal)("error", e.to_detail_string()));
       }
+      roll_back_vin_and_vout(proposal);
       remove(proposal);
    }
 }

libraries/chain/hardfork.d/sidechain.hf

@@ -0,0 +1,4 @@
+// sidechain fardfork
+#ifndef HARDFORK_SIDECHAIN_TIME
+#define HARDFORK_SIDECHAIN_TIME (fc::time_point_sec( 1550000000 ))
+#endif

libraries/chain/include/graphene/chain/bitcoin_address_evaluator.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <graphene/chain/evaluator.hpp>
+#include <graphene/chain/exceptions.hpp>
+
+namespace graphene { namespace chain {
+
+class bitcoin_address_create_evaluator : public evaluator<bitcoin_address_create_evaluator>
+{
+public:
+   typedef bitcoin_address_create_operation operation_type;
+
+   void_result do_evaluate(const bitcoin_address_create_operation& op);
+
+   object_id_type do_apply(const bitcoin_address_create_operation& op);
+   
+   public_key_type pubkey_from_id( object_id_type id );
+};
+
+} } // graphene::chain

libraries/chain/include/graphene/chain/bitcoin_address_object.hpp

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <graphene/db/generic_index.hpp>
+#include <graphene/chain/witness_object.hpp>
+
+#include <sidechain/bitcoin_address.hpp>
+
+namespace graphene { namespace chain {
+
+class bitcoin_address_object : public abstract_object<bitcoin_address_object>
+{
+   public:
+      static const uint8_t space_id = protocol_ids;
+      static const uint8_t type_id  = bitcoin_address_object_type;
+
+      bitcoin_address_id_type get_id()const { return id; }
+      // multisig m-of-n (m = 5). Address is valid before count of changed witnesses < 5
+      bool valid() { return count_invalid_pub_key < SIDECHAIN_NUMBER_INVALID_KEYS; }
+
+      std::string get_address() const { return address.get_address(); }
+
+      void update_count_invalid_pub_key( const sidechain::accounts_keys& incoming_wit_keys ) {
+         count_invalid_pub_key = incoming_wit_keys.size() - address.count_intersection( incoming_wit_keys );
+      }
+
+      account_id_type      owner;
+      sidechain::btc_multisig_segwit_address address;
+      uint8_t count_invalid_pub_key;
+};
+
+struct by_address;
+struct by_owner;
+
+typedef boost::multi_index_container<
+   bitcoin_address_object,
+   indexed_by<
+      ordered_unique< tag<by_id>, member< object, object_id_type, &object::id > >,
+      ordered_unique< tag<by_address>, const_mem_fun< bitcoin_address_object, std::string, &bitcoin_address_object::get_address > >,
+      ordered_non_unique< tag<by_owner>, member< bitcoin_address_object, account_id_type, &bitcoin_address_object::owner > >
+   >
+> bitcoin_address_multi_index_container;
+typedef generic_index<bitcoin_address_object, bitcoin_address_multi_index_container> bitcoin_address_index;
+
+} }
+
+FC_REFLECT_DERIVED( graphene::chain::bitcoin_address_object, (graphene::chain::object), (owner)(address)(count_invalid_pub_key) )
+

libraries/chain/include/graphene/chain/bitcoin_transaction_evaluator.hpp

@@ -0,0 +1,55 @@
+#pragma once
+
+#include <graphene/chain/evaluator.hpp>
+
+namespace sidechain { class info_for_vin; }
+
+namespace graphene { namespace chain {
+
+class bitcoin_transaction_send_evaluator : public evaluator<bitcoin_transaction_send_evaluator>
+{
+public:
+   typedef bitcoin_transaction_send_operation operation_type;
+
+   void_result do_evaluate( const bitcoin_transaction_send_operation& op );
+
+   object_id_type do_apply( const bitcoin_transaction_send_operation& op );
+
+   std::vector<fc::sha256> create_transaction_vins( bitcoin_transaction_send_operation& op );
+
+   void finalize_bitcoin_transaction( bitcoin_transaction_send_operation& op );
+
+   void send_bitcoin_transaction( const bitcoin_transaction_object& btc_tx );
+};
+
+class bitcoin_transaction_sign_evaluator : public evaluator<bitcoin_transaction_sign_evaluator>
+{
+
+public:
+
+   typedef bitcoin_transaction_sign_operation operation_type;
+
+   void_result do_evaluate( const bitcoin_transaction_sign_operation& op );
+
+   void_result do_apply( const bitcoin_transaction_sign_operation& op );
+   
+   void update_proposal( const bitcoin_transaction_sign_operation& op );
+
+   bool check_sigs( const sidechain::bytes& key_data, const std::vector<sidechain::bytes>& sigs,
+                    const std::vector<sidechain::info_for_vin>& info_for_vins, const sidechain::bitcoin_transaction& tx );
+
+};
+
+class bitcoin_transaction_revert_evaluator : public evaluator<bitcoin_transaction_revert_evaluator>
+{
+
+public:
+
+   typedef bitcoin_transaction_revert_operation operation_type;
+
+   void_result do_evaluate( const bitcoin_transaction_revert_operation& op );
+
+   void_result do_apply( const bitcoin_transaction_revert_operation& op );
+};
+
+} } // graphene::chain

libraries/chain/include/graphene/chain/bitcoin_transaction_object.hpp

@@ -0,0 +1,41 @@
+#pragma once
+
+#include <graphene/db/generic_index.hpp>
+#include <graphene/chain/protocol/types.hpp>
+#include <sidechain/bitcoin_transaction.hpp>
+
+namespace graphene { namespace chain {
+
+class bitcoin_transaction_object : public abstract_object<bitcoin_transaction_object>
+{
+   public:
+      static const uint8_t space_id = protocol_ids;
+      static const uint8_t type_id  = bitcoin_transaction_object_type;
+
+      bitcoin_transaction_id_type get_id()const { return id; }
+
+      fc::sha256                                  pw_vin;
+
+      std::vector< fc::sha256 >                   vins;
+      std::vector< info_for_vout_id_type >        vouts;
+
+      sidechain::bitcoin_transaction              transaction;
+      fc::sha256                                  transaction_id;
+
+      uint64_t                                    fee_for_size;
+};
+
+struct by_transaction_id;
+
+typedef boost::multi_index_container<
+   bitcoin_transaction_object,
+   indexed_by<
+      ordered_unique< tag< by_id >, member< object, object_id_type, &object::id > >,
+      ordered_unique< tag< by_transaction_id >, member< bitcoin_transaction_object, fc::sha256, &bitcoin_transaction_object::transaction_id > >
+   >
+> bitcoin_transaction_multi_index_container;
+typedef generic_index<bitcoin_transaction_object, bitcoin_transaction_multi_index_container> bitcoin_transaction_index;
+
+} } // graphene::chain
+
+FC_REFLECT_DERIVED( graphene::chain::bitcoin_transaction_object, (graphene::chain::object), (pw_vin)(vins)(vouts)(transaction)(transaction_id)(fee_for_size) )

libraries/chain/include/graphene/chain/config.hpp

@@ -228,3 +228,18 @@
 #define TOURNAMENT_MAX_START_DELAY                          (60*60*24*7) // 1 week
 #define GPOS_PERIOD                                         (60*60*24*30*6) // 6 months
 #define GPOS_SUBPERIOD                                      (60*60*24*30) // 1 month
+
+
+////////////////////////////////////////////////////////////////////// SideChain
+#define SIDECHAIN_SYMBOL                                 "pBTC"
+#define SIDECHAIN_PRECISION_DIGITS                       8
+#define SIDECHAIN_MAX_SHARE_SUPPLY                       int64_t(21000000ll * 100000000ll)
+#define SIDECHAIN_NUMBER_INVALID_KEYS                    5
+#define SIDECHAIN_DEFAULT_NUMBER_SIG_MULTISIG            5
+#define SIDECHAIN_DEFAULT_NUMBER_OF_CONFIRMATIONS        6
+#define SIDECHAIN_DEFAULT_MAX_UNCONFIRMED_VOUTS          25
+#define SIDECHAIN_DEFAULT_MAX_CONDENSING_TX_VINS         5
+#define SIDECHAIN_DEFAULT_MAX_CONDENSING_TX_VOUTS        5
+#define SIDECHAIN_DEFAULT_PERCENT_PAYMENT_TO_WITNESSES   (GRAPHENE_1_PERCENT/10)
+#define SIDECHAIN_NULL_VIN_IDENTIFIER                    "5feceb66ffc86f38d952786c6d696c79c2dbc239dd4e91b4" // fc::sha256::hash( "" + std::to_string( 0 ) ) - ( 8 bytes )
+//////////////////////////////////////////////////////////////////////

libraries/chain/include/graphene/chain/database.hpp

@@ -40,9 +40,20 @@
 
 #include <graphene/chain/protocol/protocol.hpp>
 
+#include <sidechain/input_withdrawal_info.hpp>
+#include <sidechain/bitcoin_transaction_confirmations.hpp>
+#include <sidechain/primary_wallet_vout_manager.hpp>
+#include <atomic>
+
 #include <fc/log/logger.hpp>
 
 #include <map>
+#include <secp256k1.h>
+
+using namespace fc::ecc;
+using sidechain::bitcoin_transaction;
+using sidechain::info_for_vin;
+using sidechain::info_for_vout;
 
 namespace graphene { namespace chain {
    using graphene::db::abstract_object;
@@ -78,7 +89,8 @@ namespace graphene { namespace chain {
             skip_assert_evaluation      = 1 << 8,  ///< used while reindexing
             skip_undo_history_check     = 1 << 9,  ///< used while reindexing
             skip_witness_schedule_check = 1 << 10,  ///< used while reindexing
-            skip_validate               = 1 << 11 ///< used prior to checkpoint, skips validate() call on transaction
+            skip_validate               = 1 << 11, ///< used prior to checkpoint, skips validate() call on transaction
+            skip_btc_tx_sending         = 1 << 12
          };
 
          /**
@@ -136,7 +148,7 @@ namespace graphene { namespace chain {
          void                              add_checkpoints( const flat_map<uint32_t,block_id_type>& checkpts );
          const flat_map<uint32_t,block_id_type> get_checkpoints()const { return _checkpoints; }
          bool before_last_checkpoint()const;
-       
+
          void check_tansaction_for_duplicated_operations(const signed_transaction& trx);
 
          bool push_block( const signed_block& b, uint32_t skip = skip_nothing );
@@ -177,7 +189,7 @@ namespace graphene { namespace chain {
          // most plugins should use the const version of get_applied_operations
          const vector<optional< operation_history_object > >& get_applied_operations()const;
 
-         // the account_history plugin uses the non-const version.  When it decides to track an 
+         // the account_history plugin uses the non-const version.  When it decides to track an
          // operation and assigns an operation_id to it, it will store that id into the operation
          // history object so other plugins that evaluate later can reference it.
          vector<optional< operation_history_object > >& get_applied_operations();
@@ -285,6 +297,7 @@ namespace graphene { namespace chain {
 
 
          uint32_t last_non_undoable_block_num() const;
+
          //////////////////// db_init.cpp ////////////////////
 
          void initialize_evaluators();
@@ -328,7 +341,7 @@ namespace graphene { namespace chain {
           * to newly created VBID and return it.
           *
           * Otherwise, credit amount to ovbid.
-          * 
+          *
           * @return ID of newly created VBO, but only if VBO was created.
           */
          optional< vesting_balance_id_type > deposit_lazy_vesting(
@@ -506,6 +519,65 @@ namespace graphene { namespace chain {
          void perform_account_maintenance(std::tuple<Types...> helpers);
          ///@}
          ///@}
+         //////////////////// db_sidechain.cpp ////////////////////
+       public:
+
+         using full_btc_tx_and_new_vins = std::pair< sidechain::full_btc_transaction, std::vector<info_for_vin> >;
+
+         std::map< account_id_type, public_key_type> get_active_witnesses_keys() const;
+         bool is_sidechain_fork_needed() const;
+         void perform_sidechain_fork();
+         bitcoin_address_object get_latest_PW() const;
+
+         const sidechain::sidechain_parameters_extension& get_sidechain_params() const;
+         const account_id_type& get_sidechain_account_id() const;
+         const asset_id_type& get_sidechain_asset_id() const;
+         int64_t get_estimated_fee( size_t tx_vsize, uint64_t estimated_feerate );
+
+         void processing_sidechain_proposals( const witness_object& current_witness, const private_key& signing_private_key );
+
+         inline bool delete_invalid_amount_with_fee( sidechain::input_withdrawal_info& i_w_info, std::vector<info_for_vin> info_vins, const uint64_t& fee, const uint64_t& count_transfer_vout );
+
+         full_btc_tx_and_new_vins create_tx_with_valid_vin( const std::vector<info_for_vout>& info_vouts,
+                                                                   const info_for_vin& info_pw_vin );
+
+         sidechain::full_btc_transaction create_btc_transaction( const std::vector<info_for_vin>& info_vins,
+                                                                 const std::vector<info_for_vout>& info_vouts,
+                                                                 const info_for_vin& info_pw_vin );
+         fc::optional<operation> create_send_btc_tx_proposal( const witness_object& current_witness );
+         operation create_sign_btc_tx_operation( const witness_object& current_witness, const private_key_type& privkey,
+                                                 const proposal_id_type& proposal_id );
+         signed_transaction create_signed_transaction( const private_key& signing_private_key, const operation& op );
+
+         void remove_sidechain_proposal_object( const proposal_object& proposal );
+
+         void roll_back_vin_and_vout( const proposal_object& proposal );
+
+         fc::optional<operation> create_bitcoin_issue_proposals( const witness_object& current_witness );
+
+         fc::optional<operation> create_bitcoin_revert_proposals( const witness_object& current_witness );
+
+         fc::signal<void( const bitcoin_transaction& )> send_btc_tx;
+
+         sidechain::input_withdrawal_info i_w_info;
+
+         sidechain::thread_safe_index<sidechain::btc_tx_confirmations_index> bitcoin_confirmations;
+
+         sidechain::primary_wallet_vout_manager pw_vout_manager;
+
+         std::atomic<uint64_t> estimated_feerate;
+
+         secp256k1_context_t* context_sign;
+
+         secp256k1_context_t* context_verify;
+
+         bool send_btc_tx_flag = true;
+
+         witness_id_type _current_witness_id;
+
+       private:
+
+         void restore_bitcoin_transaction_status(); // db_sidechain
 
          vector< processed_transaction >        _pending_tx;
          fork_database                          _fork_db;

libraries/chain/include/graphene/chain/info_for_used_vin_object.hpp

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <graphene/chain/protocol/types.hpp>
+#include <graphene/db/generic_index.hpp>
+#include <sidechain/types.hpp>
+#include <sidechain/bitcoin_address.hpp>
+
+namespace graphene { namespace chain {
+
+class info_for_used_vin_object : public abstract_object<info_for_used_vin_object>
+{
+   public:
+      static const uint8_t space_id = protocol_ids;
+      static const uint8_t type_id  = info_for_used_vin_object_type;
+
+      info_for_used_vin_id_type get_id()const { return id; }
+
+      fc::sha256 identifier;
+
+      sidechain::prev_out out;
+      std::string address;
+      sidechain::bytes script;
+};
+
+struct by_id;
+struct by_identifier;
+
+typedef boost::multi_index_container<
+   info_for_used_vin_object,
+   indexed_by<
+      ordered_unique< tag< by_id >, member< object, object_id_type, &object::id > >,
+      ordered_unique<tag<by_identifier>, member<info_for_used_vin_object, fc::sha256, &info_for_used_vin_object::identifier>>
+   >
+> info_for_used_vin_multi_index_container;
+typedef generic_index<info_for_used_vin_object, info_for_used_vin_multi_index_container> info_for_used_vin_index;
+
+} } // graphene::chain
+
+FC_REFLECT_DERIVED( graphene::chain::info_for_used_vin_object, (graphene::chain::object), (identifier)(out)(address)(script) )

libraries/chain/include/graphene/chain/info_for_vout_object.hpp

@@ -0,0 +1,55 @@
+#pragma once
+
+#include <graphene/chain/protocol/types.hpp>
+#include <graphene/db/generic_index.hpp>
+#include <sidechain/types.hpp>
+#include <sidechain/bitcoin_address.hpp>
+
+namespace graphene { namespace chain {
+
+class info_for_vout_object : public abstract_object<info_for_vout_object>
+{
+   public:
+      static const uint8_t space_id = protocol_ids;
+      static const uint8_t type_id  = info_for_vout_object_type;
+
+      struct comparer {
+         bool operator()( const info_for_vout_object& lhs, const info_for_vout_object& rhs ) const {
+            if( lhs.used != rhs.used )
+               return lhs.used < rhs.used;
+            return lhs.id < rhs.id;
+         }
+      };
+
+      bool operator==( const info_for_vout_object& ifv ) const {
+         return ( this->payer == ifv.payer ) &&
+                ( this->address == ifv.address ) &&
+                ( this->amount == ifv.amount );
+      }
+
+      info_for_vout_id_type get_id()const { return id; }
+
+      account_id_type            payer;
+      sidechain::bitcoin_address address;
+      uint64_t                   amount;
+
+      bool used = false;
+};
+
+struct by_created;
+struct by_id_and_not_used;
+
+typedef boost::multi_index_container<
+   info_for_vout_object,
+   indexed_by<
+      ordered_unique< tag< by_id >, member< object, object_id_type, &object::id > >,
+      ordered_non_unique< tag< by_created >, member< info_for_vout_object, bool, &info_for_vout_object::used > >,
+      ordered_non_unique<tag<by_id_and_not_used>, identity< info_for_vout_object >, info_for_vout_object::comparer >
+   >
+> info_for_vout_multi_index_container;
+typedef generic_index<info_for_vout_object, info_for_vout_multi_index_container> info_for_vout_index;
+
+} } // graphene::chain
+
+FC_REFLECT_DERIVED( graphene::chain::info_for_vout_object, (graphene::chain::object), (payer)(address)(amount)(used) )
+

libraries/chain/include/graphene/chain/primary_wallet_vout_object.hpp

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <graphene/db/generic_index.hpp>
+#include <graphene/chain/protocol/types.hpp>
+#include <sidechain/types.hpp>
+
+namespace graphene { namespace chain {
+
+class primary_wallet_vout_object : public abstract_object<primary_wallet_vout_object>
+{
+public:
+   static const uint8_t space_id = protocol_ids;
+   static const uint8_t type_id  = primary_wallet_vout_object_type;
+
+   struct comparer {
+      bool operator()(const primary_wallet_vout_object& lhs, const primary_wallet_vout_object& rhs) const;
+   };
+   
+   primary_wallet_vout_id_type get_id() const { return id; }
+
+   sidechain::prev_out      vout;
+   fc::sha256               hash_id; // ( sha256(hash + n_vout) - 8 bytes ) + id_obj
+
+   bool                     confirmed;
+   bool                     used;
+   
+};
+
+struct by_hash_id;
+
+typedef boost::multi_index_container<
+   primary_wallet_vout_object,
+   indexed_by<
+      ordered_unique< tag< by_id >, member< object, object_id_type, &object::id > >,
+      ordered_unique< tag< by_hash_id >, member< primary_wallet_vout_object, fc::uint256, &primary_wallet_vout_object::hash_id > >
+   >
+> primary_wallet_vout_multi_index_container;
+
+typedef generic_index<primary_wallet_vout_object, primary_wallet_vout_multi_index_container> primary_wallet_vout_index;
+
+} }
+
+FC_REFLECT_DERIVED( graphene::chain::primary_wallet_vout_object, (graphene::chain::object), (vout)(hash_id)(confirmed)(used) )
+

libraries/chain/include/graphene/chain/proposal_evaluator.hpp

@@ -30,6 +30,25 @@
 
 namespace graphene { namespace chain {
 
+   class sidechain_hardfork_visitor
+   {
+   public:
+      typedef void result_type;
+      database& db;
+      proposal_id_type prop_id;
+
+      sidechain_hardfork_visitor( database& _db, const proposal_id_type& _prop_id  ) : db( _db ), prop_id( _prop_id ) {}
+
+      template<typename T>
+      void operator()( const T &v ) const {}
+
+      void operator()( const bitcoin_transaction_send_operation &v );
+
+      void operator()( const bitcoin_issue_operation &v );
+
+      void operator()( const bitcoin_transaction_revert_operation &v );
+   };
+
    class proposal_create_evaluator : public evaluator<proposal_create_evaluator>
    {
       public:

libraries/chain/include/graphene/chain/protocol/bitcoin_address.hpp

@@ -0,0 +1,26 @@
+#pragma once
+#include <graphene/chain/protocol/base.hpp>
+
+namespace graphene { namespace chain { 
+
+   struct bitcoin_address_create_operation : public base_operation
+   {
+      struct fee_parameters_type { 
+         uint64_t fee            = 20 * GRAPHENE_BLOCKCHAIN_PRECISION;
+      };
+
+      asset             fee;
+      account_id_type   payer;
+      account_id_type   owner;
+
+      account_id_type fee_payer()const { return payer; }
+      void            validate()const {}
+      share_type      calculate_fee( const fee_parameters_type& k )const {
+         return k.fee;
+      }
+   };
+
+} } // graphene::chain
+
+FC_REFLECT( graphene::chain::bitcoin_address_create_operation::fee_parameters_type, (fee) )
+FC_REFLECT( graphene::chain::bitcoin_address_create_operation, (fee)(payer)(owner) )

libraries/chain/include/graphene/chain/protocol/bitcoin_transaction.hpp

@@ -0,0 +1,96 @@
+#pragma once
+#include <graphene/chain/protocol/base.hpp>
+#include <sidechain/input_withdrawal_info.hpp>
+#include <sidechain/bitcoin_transaction.hpp>
+
+namespace graphene { namespace chain {
+
+   struct bitcoin_transaction_send_operation : public base_operation
+   {
+      struct fee_parameters_type { 
+         uint64_t fee             = 0;
+         uint32_t price_per_kbyte = 0;
+      };
+
+      asset                                          fee;
+      account_id_type                                payer;
+
+      sidechain::info_for_vin                        pw_vin;
+      std::vector< sidechain::info_for_vin >         vins;
+      std::vector< info_for_vout_id_type >           vouts;
+
+      sidechain::bitcoin_transaction                 transaction;
+      uint64_t                                       fee_for_size;
+
+      account_id_type fee_payer()const { return payer; }
+      void            validate()const {}
+      share_type      calculate_fee( const fee_parameters_type& k )const {
+         share_type fee_required = k.fee;
+            fee_required += calculate_data_fee( fc::raw::pack_size(*this), k.price_per_kbyte );
+         return fee_required;
+      }
+   };
+
+   struct bitcoin_transaction_sign_operation : public base_operation
+   {
+      struct fee_parameters_type {
+         uint64_t fee             = 0;
+         uint32_t price_per_kbyte = 0;
+      };
+
+      asset                         fee;
+      account_id_type               payer;
+      proposal_id_type              proposal_id;
+      std::vector<sidechain::bytes> signatures;
+
+      account_id_type   fee_payer()const { return payer; }
+      void              validate()const {}
+      share_type        calculate_fee( const fee_parameters_type& k )const { return 0; }
+   };
+
+   struct revert_trx_info
+   {
+      revert_trx_info() = default;
+      revert_trx_info( fc::sha256 trx_id, std::set< fc::sha256 > vins ): transaction_id( trx_id ), valid_vins( vins ) {}
+
+      fc::sha256                transaction_id;
+      std::set< fc::sha256 >    valid_vins;
+
+      bool operator ==( const revert_trx_info& trx_info ){
+         return this->transaction_id == trx_info.transaction_id && this->valid_vins == trx_info.valid_vins;
+      }
+
+      bool operator !=( const revert_trx_info& trx_info ){
+         return this->transaction_id != trx_info.transaction_id || this->valid_vins != trx_info.valid_vins;
+      }
+   };
+
+   struct bitcoin_transaction_revert_operation : public base_operation
+   {
+      struct fee_parameters_type {
+         uint64_t fee             = 0;
+         uint32_t price_per_kbyte = 0;
+      };
+
+      asset                          fee;
+      account_id_type                payer;
+
+      std::vector< revert_trx_info > transactions_info;
+
+
+      account_id_type   fee_payer()const { return payer; }
+      void              validate()const {}
+      share_type        calculate_fee( const fee_parameters_type& k )const { return k.fee; }
+   };
+
+} } // graphene::chain
+
+FC_REFLECT( graphene::chain::bitcoin_transaction_send_operation::fee_parameters_type, (fee)(price_per_kbyte) )
+FC_REFLECT( graphene::chain::bitcoin_transaction_send_operation, (fee)(payer)(pw_vin)(vins)(vouts)(transaction)(fee_for_size) )
+
+FC_REFLECT( graphene::chain::bitcoin_transaction_sign_operation::fee_parameters_type, (fee)(price_per_kbyte) )
+FC_REFLECT( graphene::chain::bitcoin_transaction_sign_operation, (fee)(payer)(proposal_id)(signatures) )
+
+FC_REFLECT( graphene::chain::revert_trx_info, (transaction_id)(valid_vins) )
+FC_REFLECT( graphene::chain::bitcoin_transaction_revert_operation::fee_parameters_type, (fee)(price_per_kbyte) )
+FC_REFLECT( graphene::chain::bitcoin_transaction_revert_operation, (fee)(payer)(transactions_info) )

libraries/chain/include/graphene/chain/protocol/chain_parameters.hpp

@@ -26,6 +26,7 @@
 #include <graphene/chain/protocol/ext.hpp>
 #include <graphene/chain/protocol/types.hpp>
 #include <fc/smart_ref_fwd.hpp>
+#include <sidechain/sidechain_parameters.hpp>
 
 #include <graphene/chain/hardfork.hpp>
 
@@ -39,6 +40,7 @@ namespace graphene { namespace chain {
       optional< uint16_t >            betting_rake_fee_percentage;
       optional< flat_map<bet_multiplier_type, bet_multiplier_type> > permitted_betting_odds_increments;
       optional< uint16_t >            live_betting_delay_time;
+      optional< sidechain::sidechain_parameters_extension > sidechain_parameters;
       /* gpos parameters */
       optional < uint32_t >           gpos_period;
       optional < uint32_t >           gpos_subperiod;

libraries/chain/include/graphene/chain/protocol/operations.hpp

@@ -44,6 +44,10 @@
 #include <graphene/chain/protocol/event.hpp>
 #include <graphene/chain/protocol/betting_market.hpp>
 #include <graphene/chain/protocol/tournament.hpp>
+#include <graphene/chain/protocol/withdraw_pbtc.hpp>
+#include <graphene/chain/protocol/bitcoin_address.hpp>
+#include <graphene/chain/protocol/bitcoin_transaction.hpp>
+#include <graphene/chain/protocol/sidechain.hpp>
 
 namespace graphene { namespace chain {
 
@@ -129,7 +133,13 @@ namespace graphene { namespace chain {
             sport_delete_operation,
             event_group_delete_operation,
             affiliate_payout_operation, // VIRTUAL
-            affiliate_referral_payout_operation // VIRTUAL
+            affiliate_referral_payout_operation, // VIRTUAL
+            withdraw_pbtc_operation,
+            bitcoin_address_create_operation,
+            bitcoin_transaction_send_operation,
+            bitcoin_transaction_sign_operation,
+            bitcoin_issue_operation,
+            bitcoin_transaction_revert_operation
          > operation;
 
    /// @} // operations group

libraries/chain/include/graphene/chain/protocol/sidechain.hpp

@@ -0,0 +1,28 @@
+#pragma once
+#include <graphene/chain/protocol/base.hpp>
+
+namespace graphene { namespace chain {
+
+   struct bitcoin_issue_operation : public base_operation
+   {
+      struct fee_parameters_type { 
+         uint64_t fee             = 0;
+      };
+
+      asset                          fee;
+      account_id_type                payer;
+      std::vector<fc::sha256>        transaction_ids;
+
+
+      account_id_type fee_payer()const { return payer; }
+      void            validate()const {}
+      share_type      calculate_fee( const fee_parameters_type& k )const {
+         share_type fee_required = k.fee;
+         return fee_required;
+      }
+   };
+
+} } // graphene::chain
+
+FC_REFLECT( graphene::chain::bitcoin_issue_operation::fee_parameters_type, (fee) )
+FC_REFLECT( graphene::chain::bitcoin_issue_operation, (fee)(payer)(transaction_ids) )

libraries/chain/include/graphene/chain/protocol/types.hpp

@@ -145,6 +145,12 @@ namespace graphene { namespace chain {
       betting_market_group_object_type,
       betting_market_object_type,
       bet_object_type,
+      info_for_vout_object_type,
+      info_for_used_vin_object_type,
+      bitcoin_address_object_type,
+      primary_wallet_vout_object_type,
+      sidechain_proposal_object_type,
+      bitcoin_transaction_object_type,
       OBJECT_TYPE_COUNT ///< Sentry value which contains the number of different object types
    };
 
@@ -202,32 +208,44 @@ namespace graphene { namespace chain {
    class betting_market_group_object;
    class betting_market_object;
    class bet_object;
+   class info_for_vout_object;
+   class info_for_used_vin_object;
+   class bitcoin_address_object;
+   class primary_wallet_vout_object;
+   class sidechain_proposal_object;
+   class bitcoin_transaction_object;
 
-   typedef object_id< protocol_ids, account_object_type,            account_object>               account_id_type;
-   typedef object_id< protocol_ids, asset_object_type,              asset_object>                 asset_id_type;
-   typedef object_id< protocol_ids, force_settlement_object_type,   force_settlement_object>      force_settlement_id_type;
-   typedef object_id< protocol_ids, committee_member_object_type,           committee_member_object>              committee_member_id_type;
-   typedef object_id< protocol_ids, witness_object_type,            witness_object>               witness_id_type;
-   typedef object_id< protocol_ids, limit_order_object_type,        limit_order_object>           limit_order_id_type;
-   typedef object_id< protocol_ids, call_order_object_type,         call_order_object>            call_order_id_type;
-   typedef object_id< protocol_ids, custom_object_type,             custom_object>                custom_id_type;
-   typedef object_id< protocol_ids, proposal_object_type,           proposal_object>              proposal_id_type;
-   typedef object_id< protocol_ids, operation_history_object_type,  operation_history_object>     operation_history_id_type;
-   typedef object_id< protocol_ids, withdraw_permission_object_type,withdraw_permission_object>   withdraw_permission_id_type;
-   typedef object_id< protocol_ids, vesting_balance_object_type,    vesting_balance_object>       vesting_balance_id_type;
-   typedef object_id< protocol_ids, worker_object_type,             worker_object>                worker_id_type;
-   typedef object_id< protocol_ids, balance_object_type,            balance_object>               balance_id_type;
-   typedef object_id< protocol_ids, tournament_object_type,         tournament_object>            tournament_id_type;
-   typedef object_id< protocol_ids, tournament_details_object_type, tournament_details_object>    tournament_details_id_type;
-   typedef object_id< protocol_ids, match_object_type,              match_object>                 match_id_type;
-   typedef object_id< protocol_ids, game_object_type,               game_object>                  game_id_type;
-   typedef object_id< protocol_ids, sport_object_type,              sport_object>                 sport_id_type;
-   typedef object_id< protocol_ids, event_group_object_type,        event_group_object>           event_group_id_type;
-   typedef object_id< protocol_ids, event_object_type,              event_object>                 event_id_type;
-   typedef object_id< protocol_ids, betting_market_rules_object_type, betting_market_rules_object> betting_market_rules_id_type;
-   typedef object_id< protocol_ids, betting_market_group_object_type, betting_market_group_object> betting_market_group_id_type;
-   typedef object_id< protocol_ids, betting_market_object_type,     betting_market_object>        betting_market_id_type;
-   typedef object_id< protocol_ids, bet_object_type,                bet_object>                   bet_id_type;
+   typedef object_id< protocol_ids, account_object_type,              account_object>               account_id_type;
+   typedef object_id< protocol_ids, asset_object_type,                asset_object>                 asset_id_type;
+   typedef object_id< protocol_ids, force_settlement_object_type,     force_settlement_object>      force_settlement_id_type;
+   typedef object_id< protocol_ids, committee_member_object_type,     committee_member_object>      committee_member_id_type;
+   typedef object_id< protocol_ids, witness_object_type,              witness_object>               witness_id_type;
+   typedef object_id< protocol_ids, limit_order_object_type,          limit_order_object>           limit_order_id_type;
+   typedef object_id< protocol_ids, call_order_object_type,           call_order_object>            call_order_id_type;
+   typedef object_id< protocol_ids, custom_object_type,               custom_object>                custom_id_type;
+   typedef object_id< protocol_ids, proposal_object_type,             proposal_object>              proposal_id_type;
+   typedef object_id< protocol_ids, operation_history_object_type,    operation_history_object>     operation_history_id_type;
+   typedef object_id< protocol_ids, withdraw_permission_object_type,  withdraw_permission_object>   withdraw_permission_id_type;
+   typedef object_id< protocol_ids, vesting_balance_object_type,      vesting_balance_object>       vesting_balance_id_type;
+   typedef object_id< protocol_ids, worker_object_type,               worker_object>                worker_id_type;
+   typedef object_id< protocol_ids, balance_object_type,              balance_object>               balance_id_type;
+   typedef object_id< protocol_ids, tournament_object_type,           tournament_object>            tournament_id_type;
+   typedef object_id< protocol_ids, tournament_details_object_type,   tournament_details_object>    tournament_details_id_type;
+   typedef object_id< protocol_ids, match_object_type,                match_object>                 match_id_type;
+   typedef object_id< protocol_ids, game_object_type,                 game_object>                  game_id_type;
+   typedef object_id< protocol_ids, sport_object_type,                sport_object>                 sport_id_type;
+   typedef object_id< protocol_ids, event_group_object_type,          event_group_object>           event_group_id_type;
+   typedef object_id< protocol_ids, event_object_type,                event_object>                 event_id_type;
+   typedef object_id< protocol_ids, betting_market_rules_object_type, betting_market_rules_object>  betting_market_rules_id_type;
+   typedef object_id< protocol_ids, betting_market_group_object_type, betting_market_group_object>  betting_market_group_id_type;
+   typedef object_id< protocol_ids, betting_market_object_type,       betting_market_object>        betting_market_id_type;
+   typedef object_id< protocol_ids, bet_object_type,                  bet_object>                   bet_id_type;
+   typedef object_id< protocol_ids, info_for_vout_object_type,        info_for_vout_object>         info_for_vout_id_type;
+   typedef object_id< protocol_ids, info_for_used_vin_object_type,    info_for_used_vin_object>     info_for_used_vin_id_type;
+   typedef object_id< protocol_ids, bitcoin_address_object_type,      bitcoin_address_object>       bitcoin_address_id_type;
+   typedef object_id< protocol_ids, primary_wallet_vout_object_type,  primary_wallet_vout_object>   primary_wallet_vout_id_type;
+   typedef object_id< protocol_ids, sidechain_proposal_object_type,   sidechain_proposal_object>    sidechain_proposal_id_type;
+   typedef object_id< protocol_ids, bitcoin_transaction_object_type,  bitcoin_transaction_object>   bitcoin_transaction_id_type;
 
    // implementation types
    class global_property_object;

libraries/chain/include/graphene/chain/protocol/withdraw_pbtc.hpp

@@ -0,0 +1,33 @@
+#pragma once
+#include <graphene/chain/protocol/base.hpp>
+
+namespace graphene { namespace chain { 
+
+   struct withdraw_pbtc_operation : public base_operation
+   {
+      struct fee_parameters_type { 
+         uint64_t fee             = 20 * GRAPHENE_BLOCKCHAIN_PRECISION;
+         uint32_t price_per_kbyte = 10;
+      };
+
+      asset             fee;
+      account_id_type   payer;
+      
+      std::string       data; // address or script
+      uint64_t          amount;
+
+      // object_id_type    tx_obj_id;
+
+      account_id_type fee_payer() const { return payer; }
+      void            validate() const {}
+      share_type      calculate_fee( const fee_parameters_type& k )const {
+         share_type fee_required = k.fee;
+         fee_required += calculate_data_fee( fc::raw::pack_size(*this), k.price_per_kbyte );
+         return fee_required;
+      }
+   };
+
+} } // graphene::chain
+
+FC_REFLECT( graphene::chain::withdraw_pbtc_operation::fee_parameters_type, (fee)(price_per_kbyte) )
+FC_REFLECT( graphene::chain::withdraw_pbtc_operation, (fee)(payer)(data)(amount) )

libraries/chain/include/graphene/chain/sidechain_evaluator.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <graphene/chain/database.hpp>
+#include <graphene/chain/evaluator.hpp>
+#include <graphene/chain/exceptions.hpp>
+
+namespace graphene { namespace chain {
+
+struct bitcoin_issue_evaluator : public evaluator< bitcoin_issue_evaluator >
+{
+   typedef bitcoin_issue_operation operation_type;
+   
+   void_result do_evaluate( const bitcoin_issue_operation& op );
+
+   void_result do_apply( const bitcoin_issue_operation& op );
+
+   void add_issue( const bitcoin_transaction_object& btc_obj );
+
+   void clear_btc_transaction_information( const bitcoin_transaction_object& btc_obj );
+
+   std::vector<uint64_t> get_amounts_to_issue( std::vector<fc::sha256> vins_identifier );
+
+   std::vector<account_id_type> get_accounts_to_issue( std::vector<fc::sha256> vins_identifier );
+};
+
+} } // graphene::chain

libraries/chain/include/graphene/chain/sidechain_proposal_object.hpp

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <graphene/db/generic_index.hpp>
+#include <graphene/chain/protocol/types.hpp>
+#include <sidechain/types.hpp>
+
+namespace graphene { namespace chain {
+
+class sidechain_proposal_object : public abstract_object<sidechain_proposal_object>
+{
+   public:
+      static const uint8_t space_id = protocol_ids;
+      static const uint8_t type_id  = sidechain_proposal_object_type;
+
+      sidechain_proposal_id_type get_id()const { return id; }
+
+      proposal_id_type          proposal_id;
+      sidechain::sidechain_proposal_type   proposal_type;
+};
+
+struct by_proposal;
+struct by_type;
+typedef boost::multi_index_container<
+   sidechain_proposal_object,
+   indexed_by<
+      ordered_unique< tag< by_id >, member< object, object_id_type, &object::id > >,
+      ordered_unique< tag< by_proposal >, member< sidechain_proposal_object, proposal_id_type, &sidechain_proposal_object::proposal_id > >,
+      ordered_non_unique< tag< by_type >, member< sidechain_proposal_object, sidechain::sidechain_proposal_type, &sidechain_proposal_object::proposal_type > >
+   >
+> sidechain_multi_index_container;
+typedef generic_index<sidechain_proposal_object, sidechain_multi_index_container> sidechain_proposal_index;
+
+} } // graphene::chain
+
+FC_REFLECT_DERIVED( graphene::chain::sidechain_proposal_object, (graphene::chain::object), (proposal_id)(proposal_type) )

libraries/chain/include/graphene/chain/withdraw_pbtc_evaluator.hpp

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <graphene/chain/database.hpp>
+#include <graphene/chain/evaluator.hpp>
+#include <sidechain/types.hpp>
+
+using namespace sidechain;
+
+namespace graphene { namespace chain {
+
+class withdraw_pbtc_evaluator : public evaluator<withdraw_pbtc_evaluator>
+{
+public:
+   typedef withdraw_pbtc_operation operation_type;
+
+   void_result do_evaluate( const withdraw_pbtc_operation& op );
+
+   void_result do_apply( const withdraw_pbtc_operation& op );
+
+   void reserve_issue( const withdraw_pbtc_operation& op );
+
+   bool check_amount_higher_than_fee( const withdraw_pbtc_operation& op );
+
+   payment_type type;
+};
+
+} } // graphene::chain

libraries/chain/sidechain_evaluator.cpp

@@ -0,0 +1,141 @@
+#include <graphene/chain/sidechain_evaluator.hpp>
+#include <graphene/chain/bitcoin_transaction_object.hpp>
+#include <graphene/chain/info_for_used_vin_object.hpp>
+#include <graphene/chain/bitcoin_address_object.hpp>
+
+namespace graphene { namespace chain {
+
+void_result bitcoin_issue_evaluator::do_evaluate( const bitcoin_issue_operation& op )
+{ try {
+   database& d = db();
+
+   const auto& btc_trx_idx = d.get_index_type<bitcoin_transaction_index>().indices().get<by_transaction_id>();
+   const auto& btc_addr_idx = d.get_index_type<bitcoin_address_index>().indices().get<by_address>();
+   const auto& vins_info_idx = d.get_index_type<info_for_used_vin_index>().indices().get<by_identifier>();
+   const auto& vouts_info_idx = d.get_index_type<info_for_vout_index>().indices().get<by_id>();
+   FC_ASSERT( op.payer == db().get_sidechain_account_id() );
+
+   for( const auto& id: op.transaction_ids ) {
+      const auto& btc_itr = btc_trx_idx.find( id );
+      FC_ASSERT( btc_itr != btc_trx_idx.end() );
+
+      for( auto& vin_id : btc_itr->vins ) {
+         const auto& itr = vins_info_idx.find( vin_id );
+         FC_ASSERT( itr != vins_info_idx.end() );
+         auto addr_itr = btc_addr_idx.find( itr->address );
+         FC_ASSERT( addr_itr != btc_addr_idx.end() );
+      }
+      for( auto& vout_id : btc_itr->vouts )
+         FC_ASSERT( vouts_info_idx.find( vout_id ) != vouts_info_idx.end() );
+   }
+
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+void_result bitcoin_issue_evaluator::do_apply( const bitcoin_issue_operation& op )
+{ try {
+   database& d = db();
+   const auto& btc_trx_idx = d.get_index_type<bitcoin_transaction_index>().indices().get<by_transaction_id>();
+
+   for( const auto& id: op.transaction_ids ) {
+      const auto& btc_obj = *btc_trx_idx.find( id );
+      add_issue( btc_obj );
+
+      d.pw_vout_manager.confirm_vout( btc_obj.pw_vin );
+      clear_btc_transaction_information( btc_obj );
+   }
+
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+void bitcoin_issue_evaluator::add_issue( const bitcoin_transaction_object& btc_obj )
+{
+   database& d = db();
+
+   const auto& accounts_to_issue = get_accounts_to_issue( btc_obj.vins );
+   const auto& amounts_to_issue = get_amounts_to_issue( btc_obj.vins );
+
+   uint64_t fee_deduction = btc_obj.fee_for_size / ( btc_obj.vins.size() + btc_obj.vouts.size() );
+
+   if( btc_obj.fee_for_size % ( btc_obj.vins.size() + btc_obj.vouts.size() ) != 0 ) {
+      fee_deduction += 1;
+   }
+
+   bool skip_fee_old = trx_state->skip_fee;
+   bool skip_fee_schedule_check_old = trx_state->skip_fee_schedule_check;
+   trx_state->skip_fee = true;
+   trx_state->skip_fee_schedule_check = true;
+
+   for( size_t i = 0; i < accounts_to_issue.size(); i++ ){
+      asset_issue_operation issue_op;
+      issue_op.issuer = d.get_sidechain_account_id();
+      issue_op.asset_to_issue = asset( amounts_to_issue[i] - fee_deduction, d.get_sidechain_asset_id() );
+      issue_op.issue_to_account = accounts_to_issue[i];
+
+      d.apply_operation( *trx_state, issue_op );
+   }
+
+   trx_state->skip_fee = skip_fee_old;
+   trx_state->skip_fee_schedule_check = skip_fee_schedule_check_old;
+}
+
+void bitcoin_issue_evaluator::clear_btc_transaction_information( const bitcoin_transaction_object& btc_obj )
+{
+   database& d = db();
+   const auto& vins_info_idx = d.get_index_type<info_for_used_vin_index>().indices().get<by_identifier>();
+   const auto& vouts_info_idx = d.get_index_type<info_for_vout_index>().indices().get<by_id>();
+
+   for( auto& vin_id : btc_obj.vins ) {
+      auto vin_itr = vins_info_idx.find( vin_id );
+      d.remove( *vin_itr );
+   }
+
+   for( auto& vout_id : btc_obj.vouts ) {
+      auto vout_itr = vouts_info_idx.find( vout_id );
+      d.remove( *vout_itr );
+   }
+
+   auto trx_approvals = d.bitcoin_confirmations.find<sidechain::by_hash>( btc_obj.transaction_id );
+   if( trx_approvals.valid() ) {
+      d.bitcoin_confirmations.remove<sidechain::by_hash>( btc_obj.transaction_id );
+   }
+
+   d.remove( btc_obj );
+}
+
+std::vector<uint64_t> bitcoin_issue_evaluator::get_amounts_to_issue( std::vector<fc::sha256> vins_identifier )
+{
+   database& d = db();
+   const auto& vins_info_idx = d.get_index_type<info_for_used_vin_index>().indices().get<by_identifier>();
+
+   std::vector<uint64_t> result;
+
+   for( auto& identifier : vins_identifier ) {
+      auto vin_itr = vins_info_idx.find( identifier );
+      result.push_back( vin_itr->out.amount );
+   }
+
+   return result;
+}
+
+std::vector<account_id_type> bitcoin_issue_evaluator::get_accounts_to_issue( std::vector<fc::sha256> vins_identifier )
+{
+   database& d = db();
+   const auto& btc_addr_idx = d.get_index_type<bitcoin_address_index>().indices().get<by_address>();
+   const auto& vins_info_idx = d.get_index_type<info_for_used_vin_index>().indices().get<by_identifier>();
+
+   std::vector<account_id_type> result;
+   
+   for( auto& identifier : vins_identifier ) {
+      auto vin_itr = vins_info_idx.find( identifier );
+      auto addr_itr = btc_addr_idx.find( vin_itr->address );
+
+      result.push_back( addr_itr->owner );
+   }
+
+   return result;
+}
+
+
+
+} } // graphene::chain

libraries/chain/withdraw_pbtc_evaluator.cpp

@@ -0,0 +1,85 @@
+#include <graphene/chain/withdraw_pbtc_evaluator.hpp>
+#include <graphene/chain/info_for_vout_object.hpp>
+#include <graphene/chain/bitcoin_address_object.hpp>
+
+#include <sidechain/sidechain_condensing_tx.hpp>
+#include <sidechain/input_withdrawal_info.hpp>
+#include <sidechain/bitcoin_address.hpp>
+#include <sidechain/utils.hpp>
+
+namespace graphene { namespace chain {
+
+void_result withdraw_pbtc_evaluator::do_evaluate(const withdraw_pbtc_operation& op)
+{
+   database& d = db();
+
+   FC_ASSERT( !d.is_sidechain_fork_needed() );
+   FC_ASSERT( op.data.size() > 0 );
+   type = bitcoin_address( op.data ).get_type();
+   FC_ASSERT( type != payment_type::NULLDATA , "Invalid address type." );
+   FC_ASSERT( check_amount_higher_than_fee( op ) );
+   asset acc_balance = db().get_balance( op.payer, d.get_sidechain_asset_id() );
+   FC_ASSERT( acc_balance.amount.value >= op.amount );
+
+   return void_result();
+}
+
+void_result withdraw_pbtc_evaluator::do_apply(const withdraw_pbtc_operation& op)
+{
+   db().i_w_info.insert_info_for_vout( op.payer, op.data, op.amount );
+   reserve_issue( op );
+   return void_result();
+}
+
+void withdraw_pbtc_evaluator::reserve_issue( const withdraw_pbtc_operation& op )
+{
+   database& d = db();
+
+   bool skip_fee_old = trx_state->skip_fee;
+   bool skip_fee_schedule_check_old = trx_state->skip_fee_schedule_check;
+   trx_state->skip_fee = true;
+   trx_state->skip_fee_schedule_check = true;
+
+   asset_reserve_operation reserve_op;
+   reserve_op.amount_to_reserve = asset( op.amount, d.get_sidechain_asset_id() );
+   reserve_op.payer = op.payer;
+
+   d.apply_operation( *trx_state, reserve_op );
+
+   trx_state->skip_fee = skip_fee_old;
+   trx_state->skip_fee_schedule_check = skip_fee_schedule_check_old;
+}
+
+bool withdraw_pbtc_evaluator::check_amount_higher_than_fee( const withdraw_pbtc_operation& op ) {
+   database& d = db();
+
+   info_for_vout_object obj;
+   obj.payer = op.payer;
+   obj.address = op.data;
+   obj.amount = op.amount;
+   obj.used = false;
+
+   const auto& pw_address = d.get_latest_PW().address;
+
+   sidechain::info_for_vin pw_vin;
+   pw_vin.identifier = fc::sha256( std::string(64, '1') );
+   pw_vin.out.hash_tx = std::string(64, '1');
+   pw_vin.out.n_vout = 0;
+   pw_vin.out.amount = 2*op.amount;
+   pw_vin.address = pw_address.get_address();
+   pw_vin.script = pw_address.get_witness_script();
+
+   const auto& mock_trx = d.create_btc_transaction( {}, { obj }, pw_vin );
+
+   if( op.amount < mock_trx.second )
+      return false;
+
+   uint64_t fee_for_witnesses = ( (op.amount - mock_trx.second) * d.get_sidechain_params().percent_payment_to_witnesses ) / GRAPHENE_100_PERCENT;
+
+   if( op.amount < mock_trx.second + fee_for_witnesses )
+      return false;
+
+   return true;
+}
+
+} } // namespace graphene::chain

libraries/net/CMakeLists.txt

@@ -14,6 +14,7 @@ target_link_libraries( graphene_net
 target_include_directories( graphene_net 
   PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include"
   PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/../chain/include" "${CMAKE_CURRENT_BINARY_DIR}/../chain/include"
+  "${CMAKE_CURRENT_SOURCE_DIR}/../plugins/peerplays_sidechain/sidechain/include"
 )
 
 if(MSVC)

libraries/plugins/peerplays_sidechain/CMakeLists.txt

@@ -1,12 +1,16 @@
+add_subdirectory( sidechain )
+
 file(GLOB HEADERS "include/graphene/peerplays_sidechain_history/*.hpp")
 
 add_library( peerplays_sidechain
              peerplays_sidechain_plugin.cpp
            )
 
-target_link_libraries( peerplays_sidechain graphene_chain graphene_app )
+target_link_libraries( peerplays_sidechain sidechain graphene_chain graphene_app )
 target_include_directories( peerplays_sidechain
-                            PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include" )
+                            PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include"
+                            PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/sidechain/include"
+                            PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/sidechain/network/include" )
 
 install( TARGETS
    peerplays_sidechain
@@ -16,4 +20,3 @@ install( TARGETS
    ARCHIVE DESTINATION lib
 )
 INSTALL( FILES ${HEADERS} DESTINATION "include/graphene/peerplays_sidechain" )
-

libraries/plugins/peerplays_sidechain/include/graphene/peerplays_sidechain/peerplays_sidechain_plugin.hpp

@@ -31,4 +31,3 @@ class peerplays_sidechain_plugin : public graphene::app::plugin
 };
 
 } } //graphene::peerplays_sidechain_plugin
-

libraries/plugins/peerplays_sidechain/peerplays_sidechain_plugin.cpp

@@ -1,5 +1,9 @@
 #include <graphene/peerplays_sidechain/peerplays_sidechain_plugin.hpp>
 
+#include <sidechain/network/sidechain_net_manager.hpp>
+
+namespace bpo = boost::program_options;
+
 namespace graphene { namespace peerplays_sidechain {
 
 namespace detail
@@ -15,6 +19,10 @@ class peerplays_sidechain_plugin_impl
       virtual ~peerplays_sidechain_plugin_impl();
 
       peerplays_sidechain_plugin& _self;
+
+      sidechain::sidechain_net_manager bitcoin_manager;
+
+private:
 };
 
 peerplays_sidechain_plugin_impl::~peerplays_sidechain_plugin_impl()
@@ -40,15 +48,36 @@ std::string peerplays_sidechain_plugin::plugin_name()const
 }
 
 void peerplays_sidechain_plugin::plugin_set_program_options(
-   boost::program_options::options_description& /*cli*/,
-   boost::program_options::options_description& /*cfg*/
+   boost::program_options::options_description& cli,
+   boost::program_options::options_description& cfg
    )
 {
+   cli.add_options()
+         ("bitcoin-node-ip", bpo::value<string>()->implicit_value("127.0.0.1"), "IP address of Bitcoin node")
+         ("bitcoin-node-zmq-port", bpo::value<uint32_t>()->implicit_value(28332), "ZMQ port of Bitcoin node")
+         ("bitcoin-node-rpc-port", bpo::value<uint32_t>()->implicit_value(18332), "RPC port of Bitcoin node")
+         ("bitcoin-node-rpc-user", bpo::value<string>(), "Bitcoin RPC user")
+         ("bitcoin-node-rpc-password", bpo::value<string>(), "Bitcoin RPC password")
+         ;
+   cfg.add(cli);
 }
 
-void peerplays_sidechain_plugin::plugin_initialize(const boost::program_options::variables_map& /*options*/)
+void peerplays_sidechain_plugin::plugin_initialize(const boost::program_options::variables_map& options)
 {
    ilog("peerplays sidechain plugin:  plugin_initialize()");
+   if( options.count( "bitcoin-node-ip" ) && options.count( "bitcoin-node-zmq-port" ) && options.count( "bitcoin-node-rpc-port" )
+      && options.count( "bitcoin-node-rpc-user" ) && options.count( "bitcoin-node-rpc-password" ) )
+   {
+      const auto ip = options.at("bitcoin-node-ip").as<std::string>();
+      const auto zmq_port = options.at("bitcoin-node-zmq-port").as<uint32_t>();
+      const auto rpc_port = options.at("bitcoin-node-rpc-port").as<uint32_t>();
+      const auto rpc_user = options.at("bitcoin-node-rpc-user").as<std::string>();
+      const auto rpc_password = options.at("bitcoin-node-rpc-password").as<std::string>();
+
+      my->bitcoin_manager.initialize_manager(&database(), ip, zmq_port, rpc_port, rpc_user, rpc_password);
+   } else {
+      wlog("Haven't set up sidechain parameters");
+   }
 }
 
 void peerplays_sidechain_plugin::plugin_startup()

libraries/plugins/peerplays_sidechain/sidechain/CMakeLists.txt

@@ -0,0 +1,9 @@
+file( GLOB SOURCES "*.cpp" )
+file( GLOB HEADERS "include/*.hpp" )
+
+add_subdirectory( network )
+
+add_library( sidechain STATIC ${SOURCES} ${HEADERS} )
+
+target_link_libraries( sidechain fc graphene_chain )
+target_include_directories( sidechain PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include" )

libraries/plugins/peerplays_sidechain/sidechain/bech32.cpp

@@ -0,0 +1,192 @@
+// Copyright (c) 2017 Pieter Wuille
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <sidechain/bech32.hpp>
+
+// #include <bech32.h>
+
+namespace
+{
+
+typedef std::vector<uint8_t> data;
+
+/** The Bech32 character set for encoding. */
+const char* CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";
+
+/** The Bech32 character set for decoding. */
+const int8_t CHARSET_REV[128] = {
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    15, -1, 10, 17, 21, 20, 26, 30,  7,  5, -1, -1, -1, -1, -1, -1,
+    -1, 29, -1, 24, 13, 25,  9,  8, 23, -1, 18, 22, 31, 27, 19, -1,
+     1,  0,  3, 16, 11, 28, 12, 14,  6,  4,  2, -1, -1, -1, -1, -1,
+    -1, 29, -1, 24, 13, 25,  9,  8, 23, -1, 18, 22, 31, 27, 19, -1,
+     1,  0,  3, 16, 11, 28, 12, 14,  6,  4,  2, -1, -1, -1, -1, -1
+};
+
+/** Concatenate two byte arrays. */
+data Cat(data x, const data& y)
+{
+    x.insert(x.end(), y.begin(), y.end());
+    return x;
+}
+
+/** This function will compute what 6 5-bit values to XOR into the last 6 input values, in order to
+ *  make the checksum 0. These 6 values are packed together in a single 30-bit integer. The higher
+ *  bits correspond to earlier values. */
+uint32_t PolyMod(const data& v)
+{
+    // The input is interpreted as a list of coefficients of a polynomial over F = GF(32), with an
+    // implicit 1 in front. If the input is [v0,v1,v2,v3,v4], that polynomial is v(x) =
+    // 1*x^5 + v0*x^4 + v1*x^3 + v2*x^2 + v3*x + v4. The implicit 1 guarantees that
+    // [v0,v1,v2,...] has a distinct checksum from [0,v0,v1,v2,...].
+
+    // The output is a 30-bit integer whose 5-bit groups are the coefficients of the remainder of
+    // v(x) mod g(x), where g(x) is the Bech32 generator,
+    // x^6 + {29}x^5 + {22}x^4 + {20}x^3 + {21}x^2 + {29}x + {18}. g(x) is chosen in such a way
+    // that the resulting code is a BCH code, guaranteeing detection of up to 3 errors within a
+    // window of 1023 characters. Among the various possible BCH codes, one was selected to in
+    // fact guarantee detection of up to 4 errors within a window of 89 characters.
+
+    // Note that the coefficients are elements of GF(32), here represented as decimal numbers
+    // between {}. In this finite field, addition is just XOR of the corresponding numbers. For
+    // example, {27} + {13} = {27 ^ 13} = {22}. Multiplication is more complicated, and requires
+    // treating the bits of values themselves as coefficients of a polynomial over a smaller field,
+    // GF(2), and multiplying those polynomials mod a^5 + a^3 + 1. For example, {5} * {26} =
+    // (a^2 + 1) * (a^4 + a^3 + a) = (a^4 + a^3 + a) * a^2 + (a^4 + a^3 + a) = a^6 + a^5 + a^4 + a
+    // = a^3 + 1 (mod a^5 + a^3 + 1) = {9}.
+
+    // During the course of the loop below, `c` contains the bitpacked coefficients of the
+    // polynomial constructed from just the values of v that were processed so far, mod g(x). In
+    // the above example, `c` initially corresponds to 1 mod (x), and after processing 2 inputs of
+    // v, it corresponds to x^2 + v0*x + v1 mod g(x). As 1 mod g(x) = 1, that is the starting value
+    // for `c`.
+    uint32_t c = 1;
+    for (auto v_i : v) {
+        // We want to update `c` to correspond to a polynomial with one extra term. If the initial
+        // value of `c` consists of the coefficients of c(x) = f(x) mod g(x), we modify it to
+        // correspond to c'(x) = (f(x) * x + v_i) mod g(x), where v_i is the next input to
+        // process. Simplifying:
+        // c'(x) = (f(x) * x + v_i) mod g(x)
+        //         ((f(x) mod g(x)) * x + v_i) mod g(x)
+        //         (c(x) * x + v_i) mod g(x)
+        // If c(x) = c0*x^5 + c1*x^4 + c2*x^3 + c3*x^2 + c4*x + c5, we want to compute
+        // c'(x) = (c0*x^5 + c1*x^4 + c2*x^3 + c3*x^2 + c4*x + c5) * x + v_i mod g(x)
+        //       = c0*x^6 + c1*x^5 + c2*x^4 + c3*x^3 + c4*x^2 + c5*x + v_i mod g(x)
+        //       = c0*(x^6 mod g(x)) + c1*x^5 + c2*x^4 + c3*x^3 + c4*x^2 + c5*x + v_i
+        // If we call (x^6 mod g(x)) = k(x), this can be written as
+        // c'(x) = (c1*x^5 + c2*x^4 + c3*x^3 + c4*x^2 + c5*x + v_i) + c0*k(x)
+
+        // First, determine the value of c0:
+        uint8_t c0 = c >> 25;
+
+        // Then compute c1*x^5 + c2*x^4 + c3*x^3 + c4*x^2 + c5*x + v_i:
+        c = ((c & 0x1ffffff) << 5) ^ v_i;
+
+        // Finally, for each set bit n in c0, conditionally add {2^n}k(x):
+        if (c0 & 1)  c ^= 0x3b6a57b2; //     k(x) = {29}x^5 + {22}x^4 + {20}x^3 + {21}x^2 + {29}x + {18}
+        if (c0 & 2)  c ^= 0x26508e6d; //  {2}k(x) = {19}x^5 +  {5}x^4 +     x^3 +  {3}x^2 + {19}x + {13}
+        if (c0 & 4)  c ^= 0x1ea119fa; //  {4}k(x) = {15}x^5 + {10}x^4 +  {2}x^3 +  {6}x^2 + {15}x + {26}
+        if (c0 & 8)  c ^= 0x3d4233dd; //  {8}k(x) = {30}x^5 + {20}x^4 +  {4}x^3 + {12}x^2 + {30}x + {29}
+        if (c0 & 16) c ^= 0x2a1462b3; // {16}k(x) = {21}x^5 +     x^4 +  {8}x^3 + {24}x^2 + {21}x + {19}
+    }
+    return c;
+}
+
+/** Convert to lower case. */
+inline unsigned char LowerCase(unsigned char c)
+{
+    return (c >= 'A' && c <= 'Z') ? (c - 'A') + 'a' : c;
+}
+
+/** Expand a HRP for use in checksum computation. */
+data ExpandHRP(const std::string& hrp)
+{
+    data ret;
+    ret.reserve(hrp.size() + 90);
+    ret.resize(hrp.size() * 2 + 1);
+    for (size_t i = 0; i < hrp.size(); ++i) {
+        unsigned char c = hrp[i];
+        ret[i] = c >> 5;
+        ret[i + hrp.size() + 1] = c & 0x1f;
+    }
+    ret[hrp.size()] = 0;
+    return ret;
+}
+
+/** Verify a checksum. */
+bool VerifyChecksum(const std::string& hrp, const data& values)
+{
+    // PolyMod computes what value to xor into the final values to make the checksum 0. However,
+    // if we required that the checksum was 0, it would be the case that appending a 0 to a valid
+    // list of values would result in a new valid list. For that reason, Bech32 requires the
+    // resulting checksum to be 1 instead.
+    return PolyMod(Cat(ExpandHRP(hrp), values)) == 1;
+}
+
+/** Create a checksum. */
+data CreateChecksum(const std::string& hrp, const data& values)
+{
+    data enc = Cat(ExpandHRP(hrp), values);
+    enc.resize(enc.size() + 6); // Append 6 zeroes
+    uint32_t mod = PolyMod(enc) ^ 1; // Determine what to XOR into those 6 zeroes.
+    data ret(6);
+    for (size_t i = 0; i < 6; ++i) {
+        // Convert the 5-bit groups in mod to checksum values.
+        ret[i] = (mod >> (5 * (5 - i))) & 31;
+    }
+    return ret;
+}
+
+} // namespace
+
+namespace sidechain { namespace bech32 {
+
+/** Encode a Bech32 string. */
+std::string Encode(const std::string& hrp, const data& values) {
+    data checksum = CreateChecksum(hrp, values);
+    data combined = Cat(values, checksum);
+    std::string ret = hrp + '1';
+    ret.reserve(ret.size() + combined.size());
+    for (auto c : combined) {
+        ret += CHARSET[c];
+    }
+    return ret;
+}
+
+/** Decode a Bech32 string. */
+std::pair<std::string, data> Decode(const std::string& str) {
+    bool lower = false, upper = false;
+    for (size_t i = 0; i < str.size(); ++i) {
+        unsigned char c = str[i];
+        if (c < 33 || c > 126) return {};
+        if (c >= 'a' && c <= 'z') lower = true;
+        if (c >= 'A' && c <= 'Z') upper = true;
+    }
+    if (lower && upper) return {};
+    size_t pos = str.rfind('1');
+    if (str.size() > 90 || pos == str.npos || pos == 0 || pos + 7 > str.size()) {
+        return {};
+    }
+    data values(str.size() - 1 - pos);
+    for (size_t i = 0; i < str.size() - 1 - pos; ++i) {
+        unsigned char c = str[i + pos + 1];
+        int8_t rev = (c < 33 || c > 126) ? -1 : CHARSET_REV[c];
+        if (rev == -1) {
+            return {};
+        }
+        values[i] = rev;
+    }
+    std::string hrp;
+    for (size_t i = 0; i < pos; ++i) {
+        hrp += LowerCase(str[i]);
+    }
+    if (!VerifyChecksum(hrp, values)) {
+        return {};
+    }
+    return {hrp, data(values.begin(), values.end() - 6)};
+}
+
+} } // namespace sidechain::bech32

libraries/plugins/peerplays_sidechain/sidechain/bitcoin_address.cpp

@@ -0,0 +1,258 @@
+#include <sidechain/bitcoin_address.hpp>
+#include <sstream>
+#include <fc/crypto/base58.hpp>
+#include <sidechain/segwit_addr.hpp>
+#include <sidechain/bitcoin_script.hpp>
+
+namespace sidechain {
+
+bool bitcoin_address::operator==( const bitcoin_address& btc_addr ) const {
+   return ( this->address == btc_addr.address ) &&
+          ( this->type == btc_addr.type ) &&
+          ( this->raw_address == btc_addr.raw_address );
+}
+
+bytes bitcoin_address::get_script() const
+{
+   switch ( type ) {
+    case payment_type::NULLDATA:
+       return script_builder() << op::RETURN << raw_address;
+    case payment_type::P2PK:
+       return script_builder() << raw_address << op::CHECKSIG;
+    case payment_type::P2PKH:
+       return script_builder() << op::DUP << op::HASH160 << raw_address << op::EQUALVERIFY << op::CHECKSIG;
+    case payment_type::P2SH:
+    case payment_type::P2SH_WPKH:
+    case payment_type::P2SH_WSH:
+       return script_builder() << op::HASH160 << raw_address << op::EQUAL;
+    case payment_type::P2WPKH:
+    case payment_type::P2WSH:
+       return script_builder() << op::_0 << raw_address;
+    default:
+       return raw_address;
+    }
+}
+
+payment_type bitcoin_address::determine_type()
+{
+   if( is_p2pk() ) {
+      return payment_type::P2PK;
+   } else if( is_p2wpkh() ) {
+      return payment_type::P2WPKH;
+   } else if( is_p2wsh() ) {
+      return payment_type::P2WSH;
+   } else if( is_p2pkh() ) {
+      return payment_type::P2PKH;
+   } else if( is_p2sh() ) {
+      return payment_type::P2SH;
+   } else {
+      return payment_type::NULLDATA;
+   }
+}
+
+bytes bitcoin_address::determine_raw_address()
+{
+   bytes result;
+   switch( type ) {
+      case payment_type::P2PK : {
+         result = parse_hex( address );
+         break;
+      }
+      case payment_type::P2WPKH :
+      case payment_type::P2WSH : {
+         std::string prefix( address.compare(0,4,"bcrt") == 0 ? std::string( address.begin(), address.begin() + 4 ) :
+                                                                std::string( address.begin(), address.begin() + 2 ) );
+         const auto& decode_bech32 = segwit_addr::decode( prefix, address );
+         result = bytes( decode_bech32.second.begin(), decode_bech32.second.end() );
+         break;
+      }
+      case payment_type::P2SH_WPKH :
+      case payment_type::P2SH_WSH :
+      case payment_type::P2PKH :
+      case payment_type::P2SH : {
+         bytes hex_addr = fc::from_base58( address );
+         result = bytes( hex_addr.begin() + 1, hex_addr.begin() + 21 );
+         break;
+      }
+      case payment_type::NULLDATA : return result;
+   }
+   return result;
+}
+
+bool bitcoin_address::check_segwit_address( const size_segwit_address& size ) const {
+   if( !address.compare(0,4,"bcrt") || !address.compare(0,2,"bc") || !address.compare(0,2,"tb") ) {
+      std::string prefix( !address.compare(0,4,"bcrt") ? std::string(address.begin(), address.begin() + 4) :
+                                                         std::string(address.begin(), address.begin() + 2) );
+
+      const auto& decode_bech32 = segwit_addr::decode( prefix, address );
+      
+      if( decode_bech32.first == -1 || decode_bech32.second.size() != size ) {
+         return false;
+      }
+
+      return true;
+   }
+   return false;
+}
+
+bool bitcoin_address::is_p2pk() const
+{
+   try {
+      bool prefix = !address.compare(0,2,"02") || !address.compare(0,2,"03");
+      if( address.size() == 66 && prefix ) {
+         parse_hex( address );
+         return true;
+      }
+   } catch( fc::exception e ) {
+      return false;
+   }
+   return false;
+}
+
+bool bitcoin_address::is_p2wpkh() const
+{
+   return check_segwit_address( size_segwit_address::P2WPKH );
+}
+
+bool bitcoin_address::is_p2wsh() const
+{
+   return check_segwit_address( size_segwit_address::P2WSH );
+}
+
+bool bitcoin_address::is_p2pkh() const
+{
+   try {
+      bytes hex_addr = fc::from_base58( address );
+      if( hex_addr.size() == 25 && ( static_cast<unsigned char>( hex_addr[0] ) == 0x00 ||
+                                     static_cast<unsigned char>( hex_addr[0] ) == 0x6f ) ) {
+         return true;
+      }
+      return false;
+   } catch( fc::exception e ) {
+      return false;
+   }
+}
+
+bool bitcoin_address::is_p2sh() const
+{
+   try {
+      bytes hex_addr = fc::from_base58( address );
+      if( hex_addr.size() == 25 && ( static_cast<unsigned char>( hex_addr[0] ) == 0x05 ||
+                                     static_cast<unsigned char>( hex_addr[0] ) == 0xc4 ) ) {
+         return true;
+      }
+      return false;
+   } catch( fc::exception e ) {
+      return false;
+   }
+}
+
+btc_multisig_address::btc_multisig_address( const size_t n_required, const accounts_keys& keys ) :
+   keys_required ( n_required ), witnesses_keys( keys )
+{
+   create_redeem_script();
+   create_address();
+   type = payment_type::P2SH;
+}
+
+size_t btc_multisig_address::count_intersection( const accounts_keys& keys ) const
+{
+   FC_ASSERT( keys.size() > 0 );
+   
+   int intersections_count = 0;
+   for( auto& key : keys ) {
+      auto witness_key = witnesses_keys.find( key.first );
+      if( witness_key == witnesses_keys.end() ) continue;
+      if( key.second == witness_key->second )
+         intersections_count++;
+   }
+   return intersections_count;
+}
+
+void btc_multisig_address::create_redeem_script()
+{
+   FC_ASSERT( keys_required > 0 );
+   FC_ASSERT( keys_required < witnesses_keys.size() );
+   redeem_script.clear();
+   redeem_script.push_back( op_num[keys_required - 1] );
+   for( const auto& key : witnesses_keys ) {
+      std::stringstream ss;
+      ss << std::hex << key.second.key_data.size();
+      auto key_size_hex = sidechain::parse_hex( ss.str() );
+      redeem_script.insert( redeem_script.end(), key_size_hex.begin(), key_size_hex.end() );
+      redeem_script.insert( redeem_script.end(), key.second.key_data.begin(), key.second.key_data.end() );
+   }
+   redeem_script.push_back( op_num[witnesses_keys.size() - 1] );
+   redeem_script.push_back( OP_CHECKMULTISIG );
+}
+
+void btc_multisig_address::create_address()
+{
+   FC_ASSERT( redeem_script.size() > 0 );
+   raw_address.clear();
+   fc::sha256 hash256 = fc::sha256::hash( redeem_script.data(), redeem_script.size() );
+   fc::ripemd160 hash160 = fc::ripemd160::hash( hash256.data(), hash256.data_size() );
+   bytes temp_addr_hash( sidechain::parse_hex( hash160.str() ) );
+
+   raw_address.push_back( OP_HASH160 );
+   std::stringstream ss;
+   ss << std::hex << temp_addr_hash.size();
+   auto address_size_hex = sidechain::parse_hex( ss.str() );
+   raw_address.insert( raw_address.end(), address_size_hex.begin(), address_size_hex.end() );
+   raw_address.insert( raw_address.end(), temp_addr_hash.begin(), temp_addr_hash.end() );
+   raw_address.push_back( OP_EQUAL );
+}
+
+btc_multisig_segwit_address::btc_multisig_segwit_address( const size_t n_required, const accounts_keys& keys ) :
+   btc_multisig_address( n_required, keys )
+{
+   create_witness_script();
+   create_segwit_address();
+   type = payment_type::P2SH;
+}
+
+bool btc_multisig_segwit_address::operator==( const btc_multisig_segwit_address& addr ) const
+{
+   if( address != addr.address || redeem_script != addr.redeem_script ||
+       witnesses_keys != addr.witnesses_keys || witness_script != addr.witness_script ||
+       raw_address != addr.raw_address )
+      return false;
+   return true;
+}
+
+std::vector<public_key_type> btc_multisig_segwit_address::get_keys() {
+   std::vector<public_key_type> keys;
+   for( const auto& k : witnesses_keys ) {
+      keys.push_back( k.second );
+   }
+   return keys;
+}
+
+void btc_multisig_segwit_address::create_witness_script()
+{
+   const auto redeem_sha256 = fc::sha256::hash( redeem_script.data(), redeem_script.size() );
+   witness_script.push_back( OP_0 );
+   witness_script.push_back( 0x20 ); // PUSH_32
+   witness_script.insert( witness_script.end(), redeem_sha256.data(), redeem_sha256.data() + redeem_sha256.data_size() );
+}
+
+void btc_multisig_segwit_address::create_segwit_address()
+{
+   fc::sha256 hash256 = fc::sha256::hash( witness_script.data(), witness_script.size() );
+   fc::ripemd160 hash160 = fc::ripemd160::hash( hash256.data(), hash256.data_size() );
+   
+   raw_address = bytes(hash160.data(), hash160.data() + hash160.data_size() );
+   address = fc::to_base58( get_address_bytes( raw_address ) );
+}
+
+bytes btc_multisig_segwit_address::get_address_bytes( const bytes& script_hash )
+{
+   bytes address_bytes( 1, TESTNET_SCRIPT ); // 1 byte version
+   address_bytes.insert( address_bytes.end(), script_hash.begin(), script_hash.end() );
+   fc::sha256 hash256 = fc::sha256::hash( fc::sha256::hash( address_bytes.data(), address_bytes.size() ) );
+   address_bytes.insert( address_bytes.end(), hash256.data(), hash256.data() + 4 ); // 4 byte checksum
+   
+   return address_bytes;
+}
+
+}

libraries/plugins/peerplays_sidechain/sidechain/bitcoin_script.cpp

@@ -0,0 +1,60 @@
+#include <sidechain/bitcoin_script.hpp>
+#include <sidechain/serialize.hpp>
+
+namespace sidechain {
+
+script_builder& script_builder::operator<<( op opcode )
+{
+   const auto op_byte = static_cast<uint8_t>( opcode );
+   if ( op_byte < 0 || op_byte > 0xff )
+      throw std::runtime_error( "script_builder::operator<<(OP): invalid opcode" );
+   script.push_back( op_byte );
+   return *this;
+}
+
+script_builder& script_builder::operator<<( uint8_t number )
+{
+   FC_ASSERT( 0 <= number && number <= 16 );
+
+   if ( number == 0 )
+      script.push_back( static_cast<uint8_t>( op::_0 ) );
+   else
+      script.push_back( static_cast<uint8_t>( op::_1 ) + number - 1 );
+
+   return *this;
+}
+
+script_builder& script_builder::operator<<( size_t size )
+{
+   sidechain::write_compact_size( script, size );
+   return *this;
+}
+
+script_builder& script_builder::operator<<( const bytes& sc ) {
+   sidechain::write_compact_size( script, sc.size() );
+   script.insert( script.end(), sc.begin(), sc.end() );
+   return *this;
+}
+
+script_builder& script_builder::operator<<( const fc::sha256& hash )
+{
+   sidechain::write_compact_size( script, hash.data_size() );
+   script.insert( script.end(), hash.data(), hash.data() + hash.data_size() );
+   return *this;
+}
+
+script_builder& script_builder::operator<<( const fc::ripemd160& hash )
+{
+   sidechain::write_compact_size( script, hash.data_size() );
+   script.insert( script.end(), hash.data(), hash.data() + hash.data_size() );
+   return *this;
+}
+
+script_builder& script_builder::operator<<( const fc::ecc::public_key_data& pubkey_data )
+{
+   sidechain::write_compact_size( script, pubkey_data.size() );
+   script.insert( script.end(), pubkey_data.begin(), pubkey_data.begin() + pubkey_data.size() );
+   return *this;
+}
+
+}

libraries/plugins/peerplays_sidechain/sidechain/bitcoin_transaction.cpp

@@ -0,0 +1,279 @@
+#include <sidechain/bitcoin_transaction.hpp>
+#include <fc/crypto/base58.hpp>
+#include <sidechain/bitcoin_script.hpp>
+#include <sidechain/serialize.hpp>
+
+namespace sidechain {
+
+bool out_point::operator==( const out_point& op ) const
+{
+   if( this->hash == op.hash &&
+       this->n == op.n )
+   {
+      return true;
+   }
+   return false;
+}
+
+bool tx_in::operator==( const tx_in& ti ) const
+{
+   if( this->prevout == ti.prevout &&
+       this->scriptSig == ti.scriptSig &&
+       this->nSequence == ti.nSequence )
+   {
+      return true;
+   }
+   return false;
+}
+
+bool tx_out::operator==( const tx_out& to ) const
+{
+   if( this->value == to.value &&
+       this->scriptPubKey == to.scriptPubKey )
+   {
+      return true;
+   }
+   return false;
+}
+
+bool tx_out::is_p2wsh() const
+{
+   if( scriptPubKey.size() == 34 && scriptPubKey[0] == static_cast<char>(0x00) && scriptPubKey[1] == static_cast<char>(0x20) ) {
+      return true;
+   }
+   return false;
+}
+
+bool tx_out::is_p2wpkh() const
+{
+   if( scriptPubKey.size() == 22 && scriptPubKey[0] == static_cast<char>(0x00) && scriptPubKey[1] == static_cast<char>(0x14) ) {
+      return true;
+   }
+   return false;
+}
+
+bool tx_out::is_p2pkh() const
+{
+   if( scriptPubKey.size() == 25 && scriptPubKey[0] == static_cast<char>(0x76) && scriptPubKey[1] == static_cast<char>(0xa9) &&
+      scriptPubKey[2] == static_cast<char>(0x14) && scriptPubKey[23] == static_cast<char>(0x88) && scriptPubKey[24] == static_cast<char>(0xac) ) {
+         return true;
+   }
+   return false;
+}
+
+bool tx_out::is_p2sh() const
+{
+   if( scriptPubKey.size() == 23 && scriptPubKey[0] == static_cast<char>(0xa9) &&
+      scriptPubKey[1] == static_cast<char>(0x14) && scriptPubKey[22] == static_cast<char>(0x87) ) {
+         return true;
+   }
+   return false;
+}
+
+bool tx_out::is_p2pk() const
+{
+   if( scriptPubKey.size() == 35 && scriptPubKey[0] == static_cast<char>(0x21) && scriptPubKey[34] == static_cast<char>(0xac) ) {
+      return true;
+   }
+   return false;
+}
+
+bytes tx_out::get_data_or_script() const
+{
+   if( is_p2pkh() ) {
+      return bytes( scriptPubKey.begin() + 3, scriptPubKey.begin() + 23 );
+   } else if( is_p2sh() || is_p2wpkh() ) {
+      return bytes( scriptPubKey.begin() + 2, scriptPubKey.begin() + 22 );
+   } else if( is_p2wsh() ) {
+      return bytes( scriptPubKey.begin() + 2, scriptPubKey.begin() + 34 );
+   } else if( is_p2pk() ) {
+      return bytes( scriptPubKey.begin() + 1, scriptPubKey.begin() + 34 );
+   }
+   return scriptPubKey;
+}
+
+bool bitcoin_transaction::operator!=( const bitcoin_transaction& bt ) const
+{
+   if( this->nVersion != bt.nVersion ||
+      this->vin != bt.vin ||
+      this->vout != bt.vout ||
+      this->nLockTime != bt.nLockTime )
+   {
+      return true;
+   }
+   return false;
+}
+
+fc::sha256 bitcoin_transaction::get_hash() const
+{
+   const auto bytes = pack( *this, true) ;
+   const auto hash = fc::sha256::hash( fc::sha256::hash(bytes.data(), bytes.size()) );
+   std::reverse( hash.data(), hash.data() + hash.data_size() );
+   return hash;
+}
+
+fc::sha256 bitcoin_transaction::get_txid() const
+{
+   const auto bytes = pack( *this, false );
+   const auto hash = fc::sha256::hash( fc::sha256::hash(bytes.data(), bytes.size()) );
+   std::reverse( hash.data(), hash.data() + hash.data_size() );
+   return hash;
+}
+
+size_t bitcoin_transaction::get_vsize() const
+{
+   static const auto witness_scale_factor = 4;
+
+   fc::datastream<size_t> no_wit_ds;
+   pack( no_wit_ds, *this, false );
+
+   fc::datastream<size_t> wit_ds;
+   pack( wit_ds, *this, true );
+
+   const size_t weight = no_wit_ds.tellp() * ( witness_scale_factor - 1 ) + wit_ds.tellp();
+   const size_t vsize = ( weight + witness_scale_factor - 1 ) / witness_scale_factor;
+
+   return vsize;
+}
+
+void bitcoin_transaction_builder::set_version( int32_t version )
+{
+    tx.nVersion = version;
+}
+
+void bitcoin_transaction_builder::set_locktime(uint32_t lock_time)
+{
+    tx.nLockTime = lock_time;
+}
+
+void bitcoin_transaction_builder::add_in( payment_type type, const fc::sha256& txid, uint32_t n_out, const bytes& script_code, bool front, uint32_t sequence )
+{
+   out_point prevout;
+   prevout.hash = txid;
+   prevout.n = n_out;
+
+   tx_in txin;
+   txin.prevout = prevout;
+   txin.nSequence = sequence;
+
+   add_in( type, txin, script_code, front );
+}
+
+void bitcoin_transaction_builder::add_in( payment_type type, tx_in txin, const bytes& script_code, bool front )
+{
+   switch ( type ) {
+      case payment_type::P2SH_WPKH:
+      case payment_type::P2SH_WSH:
+         FC_ASSERT( script_code != bytes() );
+         txin.scriptSig = script_code;
+         break;
+      default:{
+         if( txin.prevout.hash == fc::sha256("0000000000000000000000000000000000000000000000000000000000000000") ) { //coinbase
+            FC_ASSERT( script_code != bytes() );
+            txin.scriptSig = script_code;
+         }
+         break;
+      }
+   }
+
+   if( front ) {
+      tx.vin.insert( tx.vin.begin(), txin );
+   } else {
+      tx.vin.push_back( txin );
+   }
+}
+
+void bitcoin_transaction_builder::add_out( payment_type type, int64_t amount, const std::string& base58_address, bool front )
+{
+   // TODO: add checks
+   const auto address_bytes = fc::from_base58(base58_address);
+   add_out( type, amount, bytes( address_bytes.begin() + 1, address_bytes.begin() + 1 + 20 ), front );
+}
+
+void bitcoin_transaction_builder::add_out( payment_type type, int64_t amount, const fc::ecc::public_key_data& pubkey, bool front )
+{
+   FC_ASSERT( is_payment_to_pubkey( type ) ); 
+
+   if ( type == payment_type::P2PK ) {
+      const auto pubkey_bytes = bytes( pubkey.begin(), pubkey.begin() + pubkey.size() );
+      add_out( type, amount, pubkey_bytes, front );
+   } else {
+      const auto hash256 = fc::sha256::hash( pubkey.begin(), pubkey.size() );
+      const auto hash160 = fc::ripemd160::hash( hash256.data(), hash256.data_size() );
+      add_out( type, amount, bytes( hash160.data(), hash160.data() + hash160.data_size() ), front );
+   }
+}
+
+void bitcoin_transaction_builder::add_out( payment_type type, int64_t amount, const bytes& script_code, bool front )
+{
+   tx_out out;
+   out.value = amount;
+   out.scriptPubKey = get_script_pubkey( type, script_code );
+
+   if( front ) {
+      tx.vout.insert( tx.vout.begin(), out );
+   } else {
+      tx.vout.push_back( out );
+   }
+}
+
+void bitcoin_transaction_builder::add_out_all_type( const uint64_t& amount, const bitcoin_address& address, bool front )
+{
+   switch( address.get_type() ) {
+      case payment_type::P2PK: {
+         bytes raw_address( address.get_raw_address() );
+         fc::ecc::public_key_data public_key;
+         std::copy( raw_address.begin(), raw_address.end(), public_key.begin() );
+         add_out( address.get_type(), amount, public_key, front );
+         break;
+      }
+      case payment_type::P2PKH:
+      case payment_type::P2SH:
+      case payment_type::P2SH_WPKH:
+      case payment_type::P2SH_WSH: {
+         add_out( address.get_type(), amount, address.get_address(), front );
+         break;
+      }
+      case payment_type::P2WPKH:
+      case payment_type::P2WSH: {
+         add_out( address.get_type(), amount, address.get_raw_address(), front );
+         break;
+      }
+   }
+}
+
+inline bool bitcoin_transaction_builder::is_payment_to_pubkey( payment_type type ) 
+{
+   switch ( type ) {
+   case payment_type::P2PK:
+   case payment_type::P2PKH:
+   case payment_type::P2WPKH:
+   case payment_type::P2SH_WPKH:
+      return true;
+   default:
+      return false;
+   }
+}
+
+bytes bitcoin_transaction_builder::get_script_pubkey( payment_type type, const bytes& script_code )
+{
+    switch ( type ) {
+    case payment_type::NULLDATA:
+       return script_builder() << op::RETURN << script_code;
+    case payment_type::P2PK:
+       return script_builder() << script_code << op::CHECKSIG;
+    case payment_type::P2PKH:
+       return script_builder() << op::DUP << op::HASH160 << script_code << op::EQUALVERIFY << op::CHECKSIG;
+    case payment_type::P2SH:
+    case payment_type::P2SH_WPKH:
+    case payment_type::P2SH_WSH:
+       return script_builder() << op::HASH160 << script_code << op::EQUAL;
+    case payment_type::P2WPKH:
+    case payment_type::P2WSH:
+       return script_builder() << op::_0 << script_code;
+    default:
+       return script_code;
+    }
+}
+
+}

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/bech32.hpp

@@ -0,0 +1,24 @@
+// Copyright (c) 2017 Pieter Wuille
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+// Bech32 is a string encoding format used in newer address types.
+// The output consists of a human-readable part (alphanumeric), a
+// separator character (1), and a base32 data section, the last
+// 6 characters of which are a checksum.
+//
+// For more information, see BIP 173.
+
+#include <stdint.h>
+#include <string>
+#include <vector>
+
+namespace sidechain { namespace bech32 {
+
+/** Encode a Bech32 string. Returns the empty string in case of failure. */
+std::string Encode(const std::string& hrp, const std::vector<uint8_t>& values);
+
+/** Decode a Bech32 string. Returns (hrp, data). Empty hrp means failure. */
+std::pair<std::string, std::vector<uint8_t>> Decode(const std::string& str);
+
+} } // namespace sidechain::bech32

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/bitcoin_address.hpp

@@ -0,0 +1,133 @@
+#pragma once
+
+#include <sidechain/types.hpp>
+#include <sidechain/utils.hpp>
+
+using namespace graphene::chain;
+
+namespace sidechain {
+
+const bytes op_num = {0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f}; // OP_1 - OP_15
+
+class bitcoin_address
+{
+
+public:
+
+   bitcoin_address() = default;
+
+   bitcoin_address( const std::string& addr ) : address( addr ), type( determine_type() ),
+      raw_address( determine_raw_address() ) {}
+
+   bool operator==( const bitcoin_address& btc_addr ) const;
+
+   payment_type get_type() const { return type; }
+
+   std::string get_address() const { return address; }
+
+   bytes get_raw_address() const { return raw_address; }
+
+   bytes get_script() const;
+
+private:
+
+   enum size_segwit_address { P2WSH = 32, P2WPKH = 20 };
+
+   payment_type determine_type();
+
+   bytes determine_raw_address();
+
+   bool check_segwit_address( const size_segwit_address& size ) const;
+
+   bool is_p2pk() const;
+
+   bool is_p2wpkh() const;
+
+   bool is_p2wsh() const;
+
+   bool is_p2pkh() const;
+
+   bool is_p2sh() const;
+
+public:
+
+   std::string address;
+
+   payment_type type;
+
+   bytes raw_address;
+
+};
+
+class btc_multisig_address : public bitcoin_address
+{
+
+public:
+
+   btc_multisig_address() = default;
+
+   btc_multisig_address( const size_t n_required, const accounts_keys& keys );
+
+   size_t count_intersection( const accounts_keys& keys ) const;
+
+   bytes get_redeem_script() const { return redeem_script; }
+
+private:
+
+   void create_redeem_script();
+
+   void create_address();
+
+public:
+
+   enum address_types { MAINNET_SCRIPT = 5, TESTNET_SCRIPT = 196 };
+
+   enum { OP_0 = 0x00, OP_EQUAL = 0x87, OP_HASH160 = 0xa9, OP_CHECKMULTISIG = 0xae };
+   
+   bytes redeem_script;
+
+   size_t keys_required = 0;
+
+   accounts_keys witnesses_keys;
+
+};
+
+// multisig segwit address (P2WSH)
+// https://0bin.net/paste/nfnSf0HcBqBUGDto#7zJMRUhGEBkyh-eASQPEwKfNHgQ4D5KrUJRsk8MTPSa
+class btc_multisig_segwit_address : public btc_multisig_address
+{
+
+public:
+
+   btc_multisig_segwit_address() = default;
+
+   btc_multisig_segwit_address( const size_t n_required, const accounts_keys& keys );
+
+   bool operator==( const btc_multisig_segwit_address& addr ) const;
+
+   bytes get_witness_script() const { return witness_script; }
+
+   std::vector<public_key_type> get_keys();
+
+private:
+
+   void create_witness_script();
+
+   void create_segwit_address();
+
+   bytes get_address_bytes( const bytes& script_hash );
+
+public:
+
+   bytes witness_script;
+
+};
+
+}
+
+FC_REFLECT( sidechain::bitcoin_address, (address)(type)(raw_address) );
+
+FC_REFLECT_DERIVED( sidechain::btc_multisig_address, (sidechain::bitcoin_address),
+   (redeem_script)(keys_required)(witnesses_keys) );
+
+FC_REFLECT_DERIVED( sidechain::btc_multisig_segwit_address, (sidechain::btc_multisig_address), (witness_script) );

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/bitcoin_script.hpp

@@ -0,0 +1,69 @@
+#pragma once
+
+#include <sidechain/types.hpp>
+
+namespace sidechain {
+
+enum class op {
+   // push value
+   _0 = 0x00,
+   _1 = 0x51,
+   _2 = 0x52,
+   _3 = 0x53,
+   _4 = 0x54,
+   _5 = 0x55,
+   _6 = 0x56,
+   _7 = 0x57,
+   _8 = 0x58,
+   _9 = 0x59,
+   _10 = 0x5a,
+   _11 = 0x5b,
+   _12 = 0x5c,
+   _13 = 0x5d,
+   _14 = 0x5e,
+   _15 = 0x5f,
+   _16 = 0x60,
+
+   // control
+   RETURN = 0x6a,
+
+   // stack ops
+   DUP = 0x76,
+
+   // bit logic
+   EQUAL = 0x87,
+   EQUALVERIFY = 0x88,
+
+   // crypto
+   HASH160 = 0xa9,
+   CHECKSIG = 0xac,
+   CHECKMULTISIG = 0xae,
+};
+
+class script_builder {
+
+public:
+
+   script_builder& operator<<( op opcode );
+
+   script_builder& operator<<( uint8_t number );
+
+   script_builder& operator<<( size_t size );
+
+   script_builder& operator<<( const bytes& sc );
+
+   script_builder& operator<<( const fc::sha256& hash );
+
+   script_builder& operator<<( const fc::ripemd160& hash );
+
+   script_builder& operator<<( const fc::ecc::public_key_data& pubkey_data );
+
+   operator bytes() const { return std::move( script ); }
+
+private:
+
+   bytes script;
+
+};
+
+}

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/bitcoin_transaction.hpp

@@ -0,0 +1,100 @@
+#pragma once
+#include <sidechain/bitcoin_address.hpp>
+
+namespace sidechain {
+
+struct out_point {
+   fc::sha256 hash;
+   uint32_t n = 0;
+   out_point() = default;
+   out_point( fc::sha256 _hash, uint32_t _n ) : hash( _hash ), n( _n ) {}
+   bool operator==( const out_point& op ) const;
+};
+
+struct tx_in {
+
+   bool operator==( const tx_in& ti ) const;
+
+   out_point prevout;
+   bytes scriptSig;
+   uint32_t nSequence = 0xffffffff;
+   std::vector<bytes> scriptWitness;
+};
+
+struct tx_out {
+   int64_t value = 0;
+   bytes scriptPubKey;
+
+   bool operator==( const tx_out& to ) const;
+
+   bool is_p2wsh() const;
+
+   bool is_p2wpkh() const;
+
+   bool is_p2pkh() const;
+
+   bool is_p2sh() const;
+
+   bool is_p2pk() const;
+
+   bytes get_data_or_script() const;
+};
+
+struct bitcoin_transaction {
+
+   bool operator!=( const bitcoin_transaction& bt ) const;
+
+   int32_t nVersion = 1;
+   std::vector<tx_in> vin;
+   std::vector<tx_out> vout;
+   uint32_t nLockTime = 0;
+
+   fc::sha256 get_hash() const;
+   fc::sha256 get_txid() const;
+   size_t get_vsize() const;
+};
+
+class bitcoin_transaction_builder
+{
+
+public:
+
+   bitcoin_transaction_builder() = default;
+
+   bitcoin_transaction_builder( const bitcoin_transaction _tx ) : tx( _tx ) {}
+
+   void set_version( int32_t version );
+
+   void set_locktime( uint32_t lock_time );
+
+   void add_in( payment_type type, const fc::sha256& txid, uint32_t n_out,
+      const bytes& script_code, bool front = false, uint32_t sequence = 0xffffffff );
+   
+   void add_in( payment_type type, tx_in txin, const bytes& script_code, bool front = false );
+
+   void add_out( payment_type type, int64_t amount, const std::string& base58_address, bool front = false );
+
+   void add_out( payment_type type, int64_t amount, const fc::ecc::public_key_data& pubkey, bool front = false );
+
+   void add_out( payment_type type, int64_t amount, const bytes& script_code, bool front = false );
+
+   void add_out_all_type( const uint64_t& amount, const bitcoin_address& address, bool front = false );
+
+   bitcoin_transaction get_transaction() const { return tx; }
+
+private:
+
+   inline bool is_payment_to_pubkey( payment_type type );
+
+   bytes get_script_pubkey( payment_type type, const bytes& script_code );
+
+   bitcoin_transaction tx;
+
+};
+
+}
+
+FC_REFLECT( sidechain::out_point, (hash)(n) )
+FC_REFLECT( sidechain::tx_in, (prevout)(scriptSig)(nSequence)(scriptWitness) )
+FC_REFLECT( sidechain::tx_out, (value)(scriptPubKey) )
+FC_REFLECT( sidechain::bitcoin_transaction, (nVersion)(vin)(vout)(nLockTime) )

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/bitcoin_transaction_confirmations.hpp

@@ -0,0 +1,61 @@
+#pragma once
+
+#include <boost/multi_index_container.hpp>
+#include <boost/multi_index/member.hpp>
+#include <boost/multi_index/ordered_index.hpp>
+
+#include <sidechain/thread_safe_index.hpp>
+#include <fc/crypto/sha256.hpp>
+
+#include <graphene/chain/protocol/types.hpp>
+
+using boost::multi_index_container;
+using namespace boost::multi_index;
+
+namespace graphene { namespace chain { class database; } }
+
+namespace sidechain {
+
+struct bitcoin_transaction_confirmations
+{
+   bitcoin_transaction_confirmations() = default;
+
+   bitcoin_transaction_confirmations( const fc::sha256& trx_id, const std::set<fc::sha256>& vins ) :
+      id( count_id_tx_conf++ ), transaction_id( trx_id ), valid_vins( vins ) {}
+
+   struct comparer {
+      bool operator()( const bitcoin_transaction_confirmations& lhs, const bitcoin_transaction_confirmations& rhs ) const {
+         if( lhs.is_confirmed_and_not_used() != rhs.is_confirmed_and_not_used() )
+            return lhs.is_confirmed_and_not_used() < rhs.is_confirmed_and_not_used();
+         return lhs.id < rhs.id;
+      }
+   };
+
+   static uint64_t count_id_tx_conf;
+   uint64_t id;
+
+   bool is_confirmed_and_not_used() const { return !used && confirmed; }
+   bool is_missing_and_not_used() const { return !used && missing; }
+
+   fc::sha256 transaction_id;
+   std::set<fc::sha256> valid_vins;
+
+   uint64_t count_block = 0;
+   bool confirmed = false;
+   bool missing = false;
+   bool used = false;
+};
+
+struct by_hash;
+struct by_confirmed_and_not_used;
+struct by_missing_and_not_used;
+
+using btc_tx_confirmations_index = boost::multi_index_container<bitcoin_transaction_confirmations,
+   indexed_by<
+      ordered_unique<tag<by_hash>, member<bitcoin_transaction_confirmations, fc::sha256, &bitcoin_transaction_confirmations::transaction_id>>,
+      ordered_non_unique<tag<by_confirmed_and_not_used>, identity< bitcoin_transaction_confirmations >, bitcoin_transaction_confirmations::comparer >,
+      ordered_non_unique<tag<by_missing_and_not_used>, identity< bitcoin_transaction_confirmations >, bitcoin_transaction_confirmations::comparer >
+   >
+>;
+
+}

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/input_withdrawal_info.hpp

@@ -0,0 +1,114 @@
+#pragma once
+
+#include <boost/multi_index_container.hpp>
+#include <boost/multi_index/member.hpp>
+#include <boost/multi_index/ordered_index.hpp>
+
+#include <sidechain/types.hpp>
+#include <sidechain/thread_safe_index.hpp>
+#include <fc/crypto/sha256.hpp>
+
+#include <graphene/chain/info_for_vout_object.hpp>
+#include <graphene/chain/protocol/types.hpp>
+
+using boost::multi_index_container;
+using namespace boost::multi_index;
+
+namespace graphene { namespace chain { class database; } }
+
+namespace sidechain {
+
+struct info_for_vin
+{
+   info_for_vin() = default;
+
+   info_for_vin( const prev_out& _out, const std::string& _address, bytes _script = bytes(), bool _resend = false );
+
+   bool operator!=( const info_for_vin& obj ) const;
+
+   struct comparer {
+      bool operator() ( const info_for_vin& lhs, const info_for_vin& rhs ) const;
+   };
+
+   static uint64_t count_id_info_for_vin;
+   uint64_t id;
+
+   fc::sha256 identifier;
+
+   prev_out out;
+   std::string address;
+   bytes script;
+
+   bool used = false;
+   bool resend = false;
+};
+
+struct by_id;
+struct by_identifier;
+struct by_id_resend_not_used;
+
+using info_for_vin_index = boost::multi_index_container<info_for_vin,
+   indexed_by<
+      ordered_unique<tag<by_id>, member<info_for_vin, uint64_t, &info_for_vin::id>>,
+      ordered_unique<tag<by_identifier>, member<info_for_vin, fc::sha256, &info_for_vin::identifier>>,
+      ordered_non_unique<tag<by_id_resend_not_used>, identity< info_for_vin >, info_for_vin::comparer >
+   >
+>;
+
+class input_withdrawal_info
+{
+
+public:
+   input_withdrawal_info( graphene::chain::database& _db ) : db( _db ) {}
+
+
+   std::vector<sidechain::bytes> get_redeem_scripts( const std::vector<info_for_vin>& info_vins );
+
+   std::vector<uint64_t> get_amounts( const std::vector<info_for_vin>& info_vins );
+
+
+   fc::optional<info_for_vin> get_info_for_pw_vin();
+
+
+   void insert_info_for_vin( const prev_out& out, const std::string& address, bytes script = bytes(), bool resend = false );
+
+   void modify_info_for_vin( const info_for_vin& obj, const std::function<void( info_for_vin& e )>& func );
+
+   void mark_as_used_vin( const info_for_vin& obj );
+
+   void mark_as_unused_vin( const info_for_vin& obj );
+
+   void remove_info_for_vin( const info_for_vin& obj );
+
+   fc::optional<info_for_vin> find_info_for_vin( fc::sha256 identifier );
+
+   size_t size_info_for_vins() { return info_for_vins.size(); }
+
+   std::vector<info_for_vin> get_info_for_vins();
+
+
+   void insert_info_for_vout( const graphene::chain::account_id_type& payer, const std::string& data, const uint64_t& amount );
+
+   void mark_as_used_vout( const graphene::chain::info_for_vout_object& obj );
+
+   void mark_as_unused_vout( const graphene::chain::info_for_vout_object& obj );
+
+   void remove_info_for_vout( const info_for_vout& obj );
+
+   fc::optional<graphene::chain::info_for_vout_object> find_info_for_vout( graphene::chain::info_for_vout_id_type id );
+
+   size_t size_info_for_vouts();
+
+   std::vector<info_for_vout> get_info_for_vouts();
+
+private:
+
+   graphene::chain::database& db;
+
+   thread_safe_index<info_for_vin_index> info_for_vins;
+
+};
+
+}
+
+FC_REFLECT( sidechain::info_for_vin, (identifier)(out)(address)(script)(used)(resend) )

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/primary_wallet_vout_manager.hpp

@@ -0,0 +1,46 @@
+#pragma once
+
+#include <graphene/chain/protocol/types.hpp>
+#include <sidechain/types.hpp>
+#include <fc/crypto/sha256.hpp>
+
+namespace graphene { namespace chain { class database; } }
+
+using graphene::chain::primary_wallet_vout_object;
+using graphene::chain::primary_wallet_vout_id_type;
+
+namespace sidechain {
+
+class primary_wallet_vout_manager
+{
+
+public:
+   primary_wallet_vout_manager( graphene::chain::database& _db ) : db( _db ) {}
+
+   bool is_max_vouts() const;
+
+   fc::optional< primary_wallet_vout_object > get_latest_unused_vout() const;
+
+   fc::optional< primary_wallet_vout_object > get_vout( fc::sha256 hash_id ) const;
+   
+   void create_new_vout( const sidechain::prev_out& out );
+
+   void delete_vouts_after( fc::sha256 hash_id );
+
+   void confirm_vout( fc::sha256 hash_id );
+
+   void mark_as_used_vout( fc::sha256 hash_id );
+
+   void mark_as_unused_vout( fc::sha256 hash_id );
+
+private:
+
+   fc::sha256 create_hash_id( const std::string& hash_tx, const uint32_t& n_vout, const uint64_t& id ) const;
+
+   fc::optional< primary_wallet_vout_id_type > get_vout_id( fc::sha256 hash_id ) const;
+
+   graphene::chain::database& db;
+
+};
+
+}

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/segwit_addr.hpp

@@ -0,0 +1,34 @@
+/* Copyright (c) 2017 Pieter Wuille
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <vector>
+#include <string>
+
+namespace sidechain { namespace segwit_addr {
+
+/** Decode a SegWit address. Returns (witver, witprog). witver = -1 means failure. */
+std::pair<int, std::vector<uint8_t> > decode(const std::string& hrp, const std::string& addr);
+
+/** Encode a SegWit address. Empty string means failure. */
+std::string encode(const std::string& hrp, int witver, const std::vector<uint8_t>& witprog);
+
+} }

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/serialize.hpp

@@ -0,0 +1,360 @@
+#pragma once
+
+#include <sidechain/types.hpp>
+#include <sidechain/bitcoin_transaction.hpp>
+
+namespace sidechain {
+
+inline void write_compact_size( bytes& vec, size_t size )
+{
+   bytes sb;
+   sb.reserve( 2 );
+   if ( size < 253 ) {
+      sb.insert( sb.end(), static_cast<uint8_t>( size ) );
+   } else if ( size <= std::numeric_limits<unsigned short>::max() ) {
+      uint16_t tmp = htole16( static_cast<uint16_t>( size ) );
+      sb.insert( sb.end(), static_cast<uint8_t>( 253 ) );
+      sb.insert( sb.end(), reinterpret_cast<const char*>( tmp ), reinterpret_cast<const char*>( tmp ) + sizeof( tmp ) );
+   } else if ( size <= std::numeric_limits<unsigned int>::max() ) {
+      uint32_t tmp = htole32( static_cast<uint32_t>( size ) );
+      sb.insert( sb.end(), static_cast<uint8_t>( 254 ) );
+      sb.insert( sb.end(), reinterpret_cast<const char*>( tmp ), reinterpret_cast<const char*>( tmp ) + sizeof( tmp ) );
+   } else {
+      uint64_t tmp = htole64( static_cast<uint64_t>( size ) );
+      sb.insert( sb.end(), static_cast<uint8_t>( 255 ) );
+      sb.insert( sb.end(), reinterpret_cast<const char*>( tmp ), reinterpret_cast<const char*>( tmp ) + sizeof( tmp ) );
+   }
+   vec.insert( vec.end(), sb.begin(), sb.end() );
+}
+
+template<typename Stream>
+inline void pack_compact_size(Stream& s, size_t size)
+{
+   if ( size < 253 ) {
+      fc::raw::pack( s, static_cast<uint8_t>( size ) );
+   } else if ( size <= std::numeric_limits<unsigned short>::max() ) {
+      fc::raw::pack( s, static_cast<uint8_t>( 253 ) );
+      fc::raw::pack( s, htole16( static_cast<uint16_t>( size ) ) );
+   } else if ( size <= std::numeric_limits<unsigned int>::max() ) {
+      fc::raw::pack( s, static_cast<uint8_t>( 254 ) );
+      fc::raw::pack( s, htole32(static_cast<uint32_t>( size ) ) );
+   } else {
+      fc::raw::pack( s, static_cast<uint8_t>( 255 ) );
+      fc::raw::pack( s, htole64( static_cast<uint64_t>( size ) ) );
+   }
+}
+
+template<typename Stream>
+inline uint64_t unpack_compact_size( Stream& s )
+{
+   uint8_t size;
+   uint64_t size_ret;
+
+   fc::raw::unpack( s, size );
+
+   if (size < 253) {
+      size_ret = size;
+   } else if ( size == 253 ) {
+      uint16_t tmp;
+      fc::raw::unpack( s, tmp );
+      size_ret = le16toh( tmp );
+      if ( size_ret < 253 )
+         FC_THROW_EXCEPTION( fc::parse_error_exception, "non-canonical unpack_compact_size()" );
+   } else if ( size == 254 ) {
+      uint32_t tmp;
+      fc::raw::unpack( s, tmp );
+      size_ret = le32toh( tmp );
+      if ( size_ret < 0x10000u )
+         FC_THROW_EXCEPTION( fc::parse_error_exception, "non-canonical unpack_compact_size()" );
+   } else {
+      uint32_t tmp;
+      fc::raw::unpack( s, tmp );
+      size_ret = le64toh( tmp );
+      if ( size_ret < 0x100000000ULL )
+         FC_THROW_EXCEPTION( fc::parse_error_exception, "non-canonical unpack_compact_size()" );
+   }
+
+   if ( size_ret > 0x08000000 )
+      FC_THROW_EXCEPTION( fc::parse_error_exception, "unpack_compact_size(): size too large" );
+
+   return size_ret;
+}
+
+template<typename Stream>
+inline void pack( Stream& s, const std::vector<char>& v )
+{
+   pack_compact_size( s, v.size() );
+   if ( !v.empty() )
+      s.write( v.data(), v.size() );
+}
+
+template<typename Stream>
+inline void unpack( Stream& s, std::vector<char>& v )
+{
+   const auto size = unpack_compact_size( s );
+   v.resize( size );
+   if ( size )
+      s.read( v.data(), size );
+}
+
+template<typename Stream, typename T>
+inline void pack( Stream& s, const T& val )
+{
+   fc::raw::pack( s, val );
+}
+
+template<typename Stream, typename T>
+inline void unpack( Stream& s, T& val )
+{
+   fc::raw::unpack( s, val );
+}
+
+template<typename Stream>
+inline void pack( Stream& s, const out_point& op )
+{
+   fc::sha256 reversed( op.hash );
+   std::reverse( reversed.data(), reversed.data() + reversed.data_size() );
+   s.write( reversed.data(), reversed.data_size() );
+   pack( s, op.n );
+}
+
+template<typename Stream>
+inline void unpack( Stream& s, out_point& op )
+{
+   uint64_t hash_size = op.hash.data_size();
+   std::unique_ptr<char[]> hash_data( new char[hash_size] );
+   s.read( hash_data.get(), hash_size );
+   std::reverse( hash_data.get(), hash_data.get() + hash_size );
+
+   op.hash = fc::sha256( hash_data.get(), hash_size );
+   unpack( s, op.n );
+}
+
+template<typename Stream>
+inline void pack( Stream& s, const tx_in& in )
+{
+   pack( s, in.prevout );
+   pack( s, in.scriptSig );
+   pack( s, in.nSequence );
+}
+
+template<typename Stream>
+inline void unpack( Stream& s, tx_in& in )
+{
+   unpack( s, in.prevout );
+   unpack( s, in.scriptSig );
+   unpack( s, in.nSequence );
+}
+
+template<typename Stream>
+inline void pack( Stream& s, const tx_out& out )
+{
+   pack( s, out.value );
+   pack( s, out.scriptPubKey );
+}
+
+template<typename Stream>
+inline void unpack( Stream& s, tx_out& out )
+{
+   unpack( s, out.value );
+   unpack( s, out.scriptPubKey );
+}
+
+template<typename Stream>
+inline void pack( Stream& s, const bitcoin_transaction& tx, bool with_witness = true )
+{
+   uint8_t flags = 0;
+
+   if ( with_witness ) {
+      for ( const auto& in : tx.vin ) {
+         if ( !in.scriptWitness.empty() ) {
+            flags |= 1;
+            break;
+         }
+      }
+   }
+
+   pack( s, tx.nVersion );
+
+   if ( flags ) {
+      pack_compact_size( s, 0 );
+      pack( s, flags );
+   }
+
+   pack_compact_size( s, tx.vin.size() );
+   for ( const auto& in : tx.vin )
+      pack( s, in );
+
+   pack_compact_size( s, tx.vout.size() );
+   for ( const auto& out : tx.vout )
+      pack( s, out );
+
+   if ( flags & 1 ) {
+      for ( const auto in : tx.vin ) {
+         pack_compact_size( s, in.scriptWitness.size() );
+         for ( const auto& sc : in.scriptWitness )
+            pack( s, sc );
+      }
+   }
+
+   pack( s, tx.nLockTime );
+}
+
+template<typename Stream>
+inline void unpack( Stream& s, bitcoin_transaction& tx )
+{
+   uint8_t flags = 0;
+
+   unpack( s, tx.nVersion );
+
+   auto vin_size = unpack_compact_size( s );
+   if ( vin_size == 0 ) {
+      unpack( s, flags );
+      vin_size = unpack_compact_size( s );
+   }
+
+   tx.vin.reserve( vin_size );
+   for ( size_t i = 0; i < vin_size; i++ ) {
+      tx_in in;
+      unpack( s, in );
+      tx.vin.push_back( in );
+   }
+
+   const auto vout_size = unpack_compact_size( s );
+   tx.vout.reserve( vout_size );
+   for ( size_t i = 0; i < vout_size; i++ ) {
+      tx_out out;
+      unpack( s, out );
+      tx.vout.push_back( out );
+   }
+
+   if ( flags & 1 ) {
+      for ( auto& in : tx.vin ) {
+         uint64_t stack_size = unpack_compact_size( s );
+         in.scriptWitness.reserve( stack_size );
+         for ( uint64_t i = 0; i < stack_size; i++ ) {
+            std::vector<char> script;
+            unpack( s, script );
+            in.scriptWitness.push_back( script );
+         }
+      }
+   }
+
+   unpack( s, tx.nLockTime );
+}
+
+inline std::vector<char> pack( const bitcoin_transaction& v, bool with_witness = true )
+{
+   fc::datastream<size_t> ps;
+   pack( ps, v, with_witness );
+   std::vector<char> vec( ps.tellp() );
+
+   if( !vec.empty() ) {
+      fc::datastream<char*>  ds( vec.data(), size_t( vec.size() ) );
+      pack( ds, v, with_witness );
+   }
+   return vec;
+}
+
+inline bitcoin_transaction unpack( const std::vector<char>& s )
+{ try  {
+   bitcoin_transaction tmp;
+   if( !s.empty() ) {
+      fc::datastream<const char*>  ds( s.data(), size_t( s.size() ) );
+      unpack(ds, tmp);
+   }
+   return tmp;
+} FC_RETHROW_EXCEPTIONS( warn, "error unpacking ${type}", ("type","transaction" ) ) }
+
+template<typename Stream>
+inline void pack_tx_signature( Stream& s, const std::vector<char>& scriptPubKey, const bitcoin_transaction& tx, unsigned int in_index, int hash_type )
+{
+   pack( s, tx.nVersion );
+
+   pack_compact_size( s, tx.vin.size() );
+   for ( size_t i = 0; i < tx.vin.size(); i++ ) {
+      const auto& in = tx.vin[i];
+      pack( s, in.prevout );
+      if ( i == in_index )
+         pack( s, scriptPubKey );
+      else
+         pack_compact_size( s, 0 ); // Blank signature
+      pack( s, in.nSequence );
+   }
+
+   pack_compact_size( s, tx.vout.size() );
+   for ( const auto& out : tx.vout )
+      pack( s, out );
+
+   pack( s, tx.nLockTime );
+   pack( s, hash_type );
+}
+
+template<typename Stream>
+inline void pack_tx_witness_signature( Stream& s, const std::vector<char>& scriptCode, const bitcoin_transaction& tx, unsigned int in_index, int64_t amount, int hash_type )
+{
+
+   fc::sha256 hash_prevouts;
+   fc::sha256 hash_sequence;
+   fc::sha256 hash_output;
+
+   {
+      fc::datastream<size_t> ps;
+      for ( const auto in : tx.vin )
+         pack( ps, in.prevout );
+
+      std::vector<char> vec( ps.tellp() );
+      if ( vec.size() ) {
+         fc::datastream<char*> ds( vec.data(), size_t( vec.size() ) );
+         for ( const auto in : tx.vin )
+            pack( ds, in.prevout );
+      }
+
+      hash_prevouts = fc::sha256::hash( fc::sha256::hash( vec.data(), vec.size() ) );
+   }
+
+   {
+      fc::datastream<size_t> ps;
+      for ( const auto in : tx.vin )
+         pack( ps, in.nSequence );
+
+      std::vector<char> vec( ps.tellp() );
+      if ( vec.size() ) {
+         fc::datastream<char*> ds( vec.data(), size_t( vec.size() ) );
+         for ( const auto in : tx.vin )
+            pack( ds, in.nSequence );
+      }
+
+      hash_sequence = fc::sha256::hash( fc::sha256::hash( vec.data(), vec.size() ) );
+   };
+
+   {
+      fc::datastream<size_t> ps;
+      for ( const auto out : tx.vout )
+         pack( ps, out );
+
+      std::vector<char> vec( ps.tellp() );
+      if ( vec.size() ) {
+         fc::datastream<char*> ds( vec.data(), size_t( vec.size() ) );
+         for ( const auto out : tx.vout )
+            pack( ds, out );
+      }
+
+      hash_output = fc::sha256::hash( fc::sha256::hash( vec.data(), vec.size() ) );
+   }
+
+   pack( s, tx.nVersion );
+   pack( s, hash_prevouts );
+   pack( s, hash_sequence );
+
+   pack( s, tx.vin[in_index].prevout );
+   pack( s, scriptCode );
+   pack( s, amount );
+   pack( s, tx.vin[in_index].nSequence );
+
+   pack( s, hash_output );
+   pack( s, tx.nLockTime );
+   pack( s, hash_type );
+}
+
+}

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/sidechain_condensing_tx.hpp

@@ -0,0 +1,52 @@
+#pragma once
+#include <sidechain/input_withdrawal_info.hpp>
+#include <sidechain/bitcoin_transaction.hpp>
+
+using namespace sidechain;
+
+namespace sidechain {
+
+class sidechain_condensing_tx
+{
+
+public:
+
+   sidechain_condensing_tx( const std::vector<info_for_vin>& vin_info, const std::vector<info_for_vout>& vout_info );
+
+   void create_pw_vin( const info_for_vin& vin_info, bool front = true );
+   
+   void create_pw_vout( const uint64_t amount, const bytes& wit_script_out, bool front = true );
+
+   void create_vouts_for_witness_fee( const accounts_keys& witness_active_keys, bool front = true );
+
+   static uint64_t get_estimate_tx_size(  bitcoin_transaction tx, size_t number_witness  );
+
+   void subtract_fee( const uint64_t& fee, const uint16_t& witnesses_percentage );
+
+   bitcoin_transaction get_transaction() const { return tb.get_transaction(); }
+
+   uint64_t get_amount_vins() { return amount_vins; }
+
+   uint64_t get_amount_transfer_to_bitcoin() { return amount_transfer_to_bitcoin; }
+
+private:
+
+   void create_vins_for_condensing_tx( const std::vector<info_for_vin>& vin_info );
+
+   void create_vouts_for_condensing_tx( const std::vector<info_for_vout>& vout_info );
+
+   uint32_t count_transfer_vin = 0;
+   
+   uint32_t count_transfer_vout = 0;
+   
+   uint32_t count_witness_vout = 0;
+
+   uint64_t amount_vins = 0;
+
+   uint64_t amount_transfer_to_bitcoin = 0;
+
+   bitcoin_transaction_builder tb;
+
+};
+
+}

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/sidechain_parameters.hpp

@@ -0,0 +1,30 @@
+#pragma once
+#include <graphene/chain/protocol/types.hpp>
+
+
+namespace sidechain {
+
+   struct sidechain_parameters_extension {
+      uint8_t  maximum_condensing_tx_vins          = SIDECHAIN_DEFAULT_MAX_CONDENSING_TX_VINS;
+      uint8_t  maximum_condensing_tx_vouts         = SIDECHAIN_DEFAULT_MAX_CONDENSING_TX_VOUTS;
+      uint8_t  maximum_unconfirmed_vouts           = SIDECHAIN_DEFAULT_MAX_UNCONFIRMED_VOUTS;
+      uint16_t percent_payment_to_witnesses        = SIDECHAIN_DEFAULT_PERCENT_PAYMENT_TO_WITNESSES;
+      uint8_t  multisig_sigs_num                   = SIDECHAIN_DEFAULT_NUMBER_SIG_MULTISIG;
+      uint8_t  confirmations_num                   = SIDECHAIN_DEFAULT_NUMBER_OF_CONFIRMATIONS;
+
+      graphene::chain::account_id_type managing_account;
+      graphene::chain::asset_id_type asset_id;
+   };
+
+}
+
+FC_REFLECT( sidechain::sidechain_parameters_extension, 
+            (maximum_condensing_tx_vins)
+            (maximum_condensing_tx_vouts)
+            (maximum_unconfirmed_vouts)
+            (percent_payment_to_witnesses)
+            (multisig_sigs_num)
+            (confirmations_num)
+            (managing_account)
+            (asset_id)
+)

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/sidechain_proposal_checker.hpp

@@ -0,0 +1,52 @@
+#pragma once
+#include <sidechain/types.hpp>
+#include <sidechain/input_withdrawal_info.hpp>
+#include <graphene/chain/protocol/bitcoin_transaction.hpp>
+#include <graphene/chain/protocol/operations.hpp>
+
+namespace graphene { namespace chain { class database; } };
+
+namespace sidechain {
+
+class sidechain_proposal_checker
+{
+
+public:
+
+   sidechain_proposal_checker( graphene::chain::database& _db ) : db(_db) {}
+
+   bool check_bitcoin_transaction_send_operation( const bitcoin_transaction_send_operation& op );
+
+   bool check_reuse( const graphene::chain::operation& op );
+   
+   bool check_witness_opportunity_to_approve( const witness_object& current_witness, const proposal_object& proposal );
+
+   bool check_witnesses_keys( const witness_object& current_witness, const proposal_object& proposal );
+
+   bool check_bitcoin_transaction_revert_operation( const bitcoin_transaction_revert_operation& op );
+
+private:
+
+   bool check_info_for_pw_vin( const info_for_vin& info_for_vin );
+
+   bool check_info_for_vins( const std::vector<info_for_vin>& info_for_vins );
+
+   bool check_info_for_vouts( const std::vector<info_for_vout_id_type>& info_for_vout_ids );
+
+   bool check_transaction( const bitcoin_transaction_send_operation& btc_trx_op );
+
+   bool check_reuse_pw_vin( const fc::sha256& pw_vin );
+
+   bool check_reuse_user_vins( const std::vector<fc::sha256>& user_vin_identifiers );
+
+   bool check_reuse_vouts( const std::vector<info_for_vout_id_type>& user_vout_ids );
+
+   std::set<fc::sha256> pw_vin_ident;
+   std::set<fc::sha256> user_vin_ident;
+   std::set<info_for_vout_id_type> vout_ids;
+
+   graphene::chain::database& db;
+
+};
+
+}

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/sign_bitcoin_transaction.hpp

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <sidechain/types.hpp>
+#include <sidechain/input_withdrawal_info.hpp>
+#include <secp256k1.h>
+
+namespace sidechain {
+
+class bitcoin_transaction;
+
+fc::sha256 get_signature_hash( const bitcoin_transaction& tx, const bytes& scriptPubKey, int64_t amount,
+                               size_t in_index, int hash_type, bool is_witness );
+
+std::vector<char> privkey_sign( const bytes& privkey, const fc::sha256 &hash, const secp256k1_context_t* context_sign = nullptr );
+
+std::vector<bytes> sign_witness_transaction_part( const bitcoin_transaction& tx, const std::vector<bytes>& redeem_scripts,
+                                                  const std::vector<uint64_t>& amounts, const bytes& privkey,
+                                                  const secp256k1_context_t* context_sign = nullptr, int hash_type = 1 );
+
+void sign_witness_transaction_finalize( bitcoin_transaction& tx, const std::vector<bytes>& redeem_scripts );
+
+bool verify_sig( const bytes& sig, const bytes& pubkey, const bytes& msg, const secp256k1_context_t* context );
+
+std::vector<std::vector<bytes>> sort_sigs( const bitcoin_transaction& tx, const std::vector<bytes>& redeem_scripts,
+                                           const std::vector<uint64_t>& amounts, const secp256k1_context_t* context );
+
+}

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/thread_safe_index.hpp

@@ -0,0 +1,82 @@
+#pragma once
+
+#include <mutex>
+#include <fc/optional.hpp>
+
+namespace sidechain {
+
+template<class T1>
+class thread_safe_index
+{
+
+public:
+
+   using iterator = typename T1::iterator;
+
+   std::pair<iterator,bool> insert( const typename T1::value_type& value ) {
+      std::lock_guard<std::recursive_mutex> locker( lock );
+      return data.insert( value );
+   }
+
+   template<class T2, typename Key>
+   bool modify( const Key _key, const std::function<void( typename T1::value_type& e)>& func ) {
+      std::lock_guard<std::recursive_mutex> locker( lock );
+      const auto option = find_iterator<T2>( _key );
+      if( !option )
+         return false;
+      data.modify( data.iterator_to( **option ), [&func]( typename T1::value_type& obj ) { func( obj ); } );
+      return true;
+   }
+
+   template<class T2, typename Key>
+   bool remove( const Key _key ) {
+      std::lock_guard<std::recursive_mutex> locker( lock );
+      const auto option = find_iterator<T2>( _key );
+      if( !option )
+         return false;
+      data.erase( data.iterator_to( **option ) );
+      return true;
+   }
+
+   size_t size() {
+      std::lock_guard<std::recursive_mutex> locker( lock );
+      return data.size();
+   }
+
+   template<class T2, typename Key>
+   fc::optional<typename T1::value_type> find( const Key _key ) {
+      std::lock_guard<std::recursive_mutex> locker( lock );
+      auto& index = data.template get<T2>();
+      auto it = index.find( _key );
+      if( it != index.end() ) {
+         return fc::optional<typename T1::value_type>(*it);
+      }
+      return fc::optional<typename T1::value_type>();
+   }
+
+   template<class T2>
+   void safe_for(std::function<void(typename T1::template index<T2>::type::iterator itr1, 
+                                    typename T1::template index<T2>::type::iterator itr2)> func) {
+       std::lock_guard<std::recursive_mutex> locker( lock );
+       auto& index = data.template get<T2>();
+       func(index.begin(), index.end());
+   }
+
+private:
+
+   template<class T2, typename Key>
+   fc::optional<typename T1::template index<T2>::type::iterator> find_iterator( const Key _key ) {
+      auto& index = data.template get<T2>();
+      auto it = index.find( _key );
+      if( it == index.end() )
+         return fc::optional<typename T1::template index<T2>::type::iterator>();
+      return it;
+   }
+
+   std::recursive_mutex lock;
+   
+   T1 data;
+
+};
+
+}

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/types.hpp

@@ -0,0 +1,60 @@
+#pragma once
+
+#include <map>
+#include <vector>
+#include <string>
+#include <fc/reflect/reflect.hpp>
+
+#include <graphene/chain/protocol/types.hpp>
+
+namespace sidechain {
+
+class bitcoin_transaction;
+
+using bytes = std::vector<char>;
+using accounts_keys = std::map< graphene::chain::account_id_type, graphene::chain::public_key_type >;
+using info_for_vout = graphene::chain::info_for_vout_object;
+using full_btc_transaction = std::pair<bitcoin_transaction, uint64_t>;
+
+enum class payment_type
+{
+   NULLDATA,
+   P2PK,
+   P2PKH,
+   P2SH,
+   P2WPKH,
+   P2WSH,
+   P2SH_WPKH,
+   P2SH_WSH
+};
+
+enum class sidechain_proposal_type
+{
+   ISSUE_BTC,
+   SEND_BTC_TRANSACTION,
+   REVERT_BTC_TRANSACTION
+};
+
+struct prev_out
+{
+   bool operator!=( const prev_out& obj ) const
+   {
+      if( this->hash_tx != obj.hash_tx ||
+          this->n_vout != obj.n_vout ||
+          this->amount != obj.amount )
+      {
+         return true;
+      }
+      return false;
+   }
+
+   std::string hash_tx;
+   uint32_t n_vout;
+   uint64_t amount;
+};
+
+}
+
+FC_REFLECT_ENUM( sidechain::payment_type, (NULLDATA)(P2PK)(P2PKH)(P2SH)(P2WPKH)(P2WSH)(P2SH_WPKH)(P2SH_WSH) );
+FC_REFLECT_ENUM( sidechain::sidechain_proposal_type, (ISSUE_BTC)(SEND_BTC_TRANSACTION)(REVERT_BTC_TRANSACTION) );
+FC_REFLECT( sidechain::prev_out, (hash_tx)(n_vout)(amount) );

libraries/plugins/peerplays_sidechain/sidechain/include/sidechain/utils.hpp

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <sidechain/types.hpp>
+#include <fc/crypto/hex.hpp>
+#include <fc/crypto/elliptic.hpp>
+
+namespace sidechain {
+
+bytes parse_hex( const std::string& str );
+
+std::vector<bytes> get_pubkey_from_redeemScript( bytes script );
+
+bytes public_key_data_to_bytes( const fc::ecc::public_key_data& key );
+
+}

libraries/plugins/peerplays_sidechain/sidechain/input_withdrawal_info.cpp

@@ -0,0 +1,207 @@
+#include <sidechain/input_withdrawal_info.hpp>
+#include <graphene/chain/database.hpp>
+#include <graphene/chain/primary_wallet_vout_object.hpp>
+#include <graphene/chain/bitcoin_address_object.hpp>
+#include <sidechain/bitcoin_transaction_confirmations.hpp>
+
+namespace sidechain {
+
+uint64_t info_for_vin::count_id_info_for_vin = 0;
+uint64_t bitcoin_transaction_confirmations::count_id_tx_conf = 0;
+
+info_for_vin::info_for_vin( const prev_out& _out, const std::string& _address, bytes _script, bool _resend ) :
+   id( count_id_info_for_vin++ ), out( _out ), address( _address ), script( _script ), resend( _resend )
+{
+   identifier = fc::sha256::hash( out.hash_tx + std::to_string( out.n_vout ) );
+}
+
+bool info_for_vin::operator!=( const info_for_vin& obj ) const
+{
+   if( this->identifier != obj.identifier ||
+       this->out.hash_tx != obj.out.hash_tx ||
+       this->out.n_vout != obj.out.n_vout ||
+       this->out.amount != obj.out.amount ||
+       this->address != obj.address ||
+       this->script != obj.script )
+   {
+      return true;
+   }
+   return false;
+}
+
+bool info_for_vin::comparer::operator() ( const info_for_vin& lhs, const info_for_vin& rhs ) const
+{
+   if( lhs.used != rhs.used ) {
+      return lhs.used < rhs.used;
+   } else if ( lhs.resend != rhs.resend ) {
+      return lhs.resend > rhs.resend;
+   }
+   return lhs.id < rhs.id;
+}
+
+std::vector<bytes> input_withdrawal_info::get_redeem_scripts( const std::vector<info_for_vin>& info_vins )
+{
+   std::vector<bytes> redeem_scripts;
+   const auto& bitcoin_address_idx = db.get_index_type<bitcoin_address_index>().indices().get< by_address >();
+   for( const auto& v : info_vins ) {
+      const auto& pbtc_address = bitcoin_address_idx.find( v.address );
+      redeem_scripts.push_back( pbtc_address->address.get_redeem_script() );
+   }
+   return redeem_scripts;
+}
+
+std::vector<uint64_t> input_withdrawal_info::get_amounts( const std::vector<info_for_vin>& info_vins )
+{
+   std::vector<uint64_t> amounts;
+   for( const auto& v : info_vins ) {
+      amounts.push_back( v.out.amount );
+   }
+   return amounts;
+}
+
+fc::optional<info_for_vin> input_withdrawal_info::get_info_for_pw_vin()
+{
+   fc::optional< primary_wallet_vout_object > vout = db.pw_vout_manager.get_latest_unused_vout();
+   if( !vout.valid() || db.pw_vout_manager.is_max_vouts() ) {
+      return fc::optional<info_for_vin>();
+   }
+
+   const auto& pw_address = db.get_latest_PW().address;
+
+   info_for_vin vin;
+   vin.identifier = vout->hash_id;
+   vin.out = vout->vout;
+   vin.address = pw_address.get_address();
+   vin.script = pw_address.get_witness_script();
+
+   return vin;
+}
+
+void input_withdrawal_info::insert_info_for_vin( const prev_out& out, const std::string& address, bytes script, bool resend )
+{
+   info_for_vins.insert( info_for_vin( out, address, script, resend ) );
+}
+
+void input_withdrawal_info::modify_info_for_vin( const info_for_vin& obj, const std::function<void( info_for_vin& e )>& func )
+{
+   info_for_vins.modify<by_identifier>( obj.identifier, func );
+}
+
+void input_withdrawal_info::mark_as_used_vin( const info_for_vin& obj )
+{
+   info_for_vins.modify<by_identifier>( obj.identifier, [&]( info_for_vin& o ) {
+      o.used = true;
+   });
+}
+
+void input_withdrawal_info::mark_as_unused_vin( const info_for_vin& obj )
+{
+   info_for_vins.modify<by_identifier>( obj.identifier, [&]( info_for_vin& o ) {
+      o.used = false;
+   });
+}
+
+void input_withdrawal_info::remove_info_for_vin( const info_for_vin& obj )
+{
+   info_for_vins.remove<by_identifier>( obj.identifier );
+}
+
+fc::optional<info_for_vin> input_withdrawal_info::find_info_for_vin( fc::sha256 identifier )
+{ 
+   return info_for_vins.find<by_identifier>( identifier );
+}
+
+std::vector<info_for_vin> input_withdrawal_info::get_info_for_vins()
+{
+   std::vector<info_for_vin> result;
+   const auto max_vins = db.get_sidechain_params().maximum_condensing_tx_vins;
+
+   info_for_vins.safe_for<by_id_resend_not_used>( [&]( info_for_vin_index::index<by_id_resend_not_used>::type::iterator itr_b,
+                                                       info_for_vin_index::index<by_id_resend_not_used>::type::iterator itr_e )
+   {
+      for( size_t i = 0; itr_b != itr_e && i < max_vins && !itr_b->used; i++ ) {
+         info_for_vin vin;
+         vin.identifier = itr_b->identifier;
+         vin.out.hash_tx = itr_b->out.hash_tx;
+         vin.out.n_vout = itr_b->out.n_vout;
+         vin.out.amount = itr_b->out.amount;
+         vin.address = itr_b->address;
+         vin.script = itr_b->script;
+         
+         result.push_back( vin );
+         ++itr_b;
+      }
+   } );
+
+   return result;
+}
+
+void input_withdrawal_info::insert_info_for_vout( const graphene::chain::account_id_type& payer, const std::string& data, const uint64_t& amount )
+{
+   db.create<graphene::chain::info_for_vout_object>([&](graphene::chain::info_for_vout_object& obj) {
+      obj.payer = payer;
+      obj.address = bitcoin_address( data );
+      obj.amount = amount;
+   });
+}
+
+void input_withdrawal_info::mark_as_used_vout( const graphene::chain::info_for_vout_object& obj )
+{
+   const auto& info_for_vout_idx = db.get_index_type<graphene::chain::info_for_vout_index>().indices().get< graphene::chain::by_id >();
+   auto itr = info_for_vout_idx.find( obj.id );
+
+   db.modify<graphene::chain::info_for_vout_object>( *itr, [&]( graphene::chain::info_for_vout_object& o ) {
+      o.used = true;
+   });
+}
+
+void input_withdrawal_info::mark_as_unused_vout( const graphene::chain::info_for_vout_object& obj )
+{
+   const auto& info_for_vout_idx = db.get_index_type<graphene::chain::info_for_vout_index>().indices().get< graphene::chain::by_id >();
+   auto itr = info_for_vout_idx.find( obj.id );
+
+   db.modify<graphene::chain::info_for_vout_object>( *itr, [&]( graphene::chain::info_for_vout_object& o ) {
+      o.used = false;
+   });
+}
+
+void input_withdrawal_info::remove_info_for_vout( const info_for_vout& obj )
+{
+   const auto& info_for_vout_idx = db.get_index_type<graphene::chain::info_for_vout_index>().indices().get< graphene::chain::by_id >();
+   auto itr = info_for_vout_idx.find( obj.id );
+   db.remove( *itr );
+}
+
+fc::optional<graphene::chain::info_for_vout_object> input_withdrawal_info::find_info_for_vout( graphene::chain::info_for_vout_id_type id )
+{
+   const auto& info_for_vout_idx = db.get_index_type<graphene::chain::info_for_vout_index>().indices().get< graphene::chain::by_id >();
+   auto itr = info_for_vout_idx.find( id );
+   if( itr != info_for_vout_idx.end() )
+      return fc::optional<graphene::chain::info_for_vout_object>( *itr );
+   return fc::optional<graphene::chain::info_for_vout_object>();
+}
+
+size_t input_withdrawal_info::size_info_for_vouts()
+{
+   const auto& info_for_vout_idx = db.get_index_type<graphene::chain::info_for_vout_index>().indices().get< graphene::chain::by_id >();
+   return info_for_vout_idx.size();
+}
+
+std::vector<info_for_vout> input_withdrawal_info::get_info_for_vouts()
+{
+   std::vector<info_for_vout> result;
+
+   const auto& info_for_vout_idx = db.get_index_type<graphene::chain::info_for_vout_index>().indices().get< graphene::chain::by_id_and_not_used >();
+   const auto max_vouts = db.get_sidechain_params().maximum_condensing_tx_vouts;
+
+   auto itr = info_for_vout_idx.begin();
+   for(size_t i = 0; i < max_vouts && itr != info_for_vout_idx.end() && !itr->used; i++) {
+
+      result.push_back( *itr );
+      ++itr;
+   }
+
+   return result;
+}
+
+}

libraries/plugins/peerplays_sidechain/sidechain/network/CMakeLists.txt

@@ -0,0 +1,7 @@
+file( GLOB HEADERS "include/sidechain/network/*.hpp" )
+file( GLOB SOURCES "*.cpp" )
+
+add_library( sidechain_network STATIC ${SOURCES} ${HEADERS} )
+
+target_link_libraries( sidechain_network PUBLIC graphene_chain fc zmq  )
+target_include_directories( sidechain_network PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include" )

libraries/plugins/peerplays_sidechain/sidechain/network/bitcoin_rpc_client.cpp

@@ -0,0 +1,140 @@
+#include <sidechain/network/bitcoin_rpc_client.hpp>
+
+#include <sstream>
+
+#include <fc/network/ip.hpp>
+
+#include <boost/property_tree/ptree.hpp>
+#include <boost/property_tree/json_parser.hpp>
+
+namespace sidechain {
+
+bitcoin_rpc_client::bitcoin_rpc_client( std::string _ip, uint32_t _rpc, std::string _user, std::string _password ):
+                      ip( _ip ), rpc_port( _rpc ), user( _user ), password( _password ) 
+{
+   authorization.key = "Authorization";
+   authorization.val = "Basic " + fc::base64_encode( user + ":" + password );
+}
+
+std::string bitcoin_rpc_client::receive_full_block( const std::string& block_hash )
+{
+   fc::http::connection conn;
+   conn.connect_to( fc::ip::endpoint( fc::ip::address( ip ), rpc_port ) );
+
+   const auto url = "http://" + ip + ":" + std::to_string( rpc_port ) + "/rest/block/" + block_hash + ".json";
+
+   const auto reply = conn.request( "GET", url );
+   if ( reply.status != 200 )
+      return "";
+
+   ilog( "Receive Bitcoin block: ${hash}", ( "hash", block_hash ) );
+   return std::string( reply.body.begin(), reply.body.end() );
+}
+
+int32_t bitcoin_rpc_client::receive_confirmations_tx( const std::string& tx_hash )
+{
+   const auto body = std::string("{\"jsonrpc\": \"1.0\", \"id\":\"curltest\", \"method\": \"getrawtransaction\", \"params\": [") +
+                      std::string("\"") + tx_hash + std::string("\"") + ", " + "true" + std::string("] }");
+
+   const auto reply = send_post_request( body );
+
+   if ( reply.status != 200 )
+      return 0;
+
+   const auto result = std::string( reply.body.begin(), reply.body.end() );
+   
+   std::stringstream ss( result );
+   boost::property_tree::ptree tx;
+   boost::property_tree::read_json( ss, tx );
+
+   if( tx.count( "result" ) ) {
+      if( tx.get_child( "result" ).count( "confirmations" ) ) {
+         return tx.get_child( "result" ).get_child( "confirmations" ).get_value<int64_t>();
+      }
+   }
+   return 0;
+
+}
+
+bool bitcoin_rpc_client::receive_mempool_entry_tx( const std::string& tx_hash )
+{
+   const auto body = std::string("{\"jsonrpc\": \"1.0\", \"id\":\"curltest\", \"method\": \"getmempoolentry\", \"params\": [") +
+                      std::string("\"") + tx_hash + std::string("\"") + std::string("] }");
+
+   const auto reply = send_post_request( body );
+
+   if ( reply.status != 200 )
+        return false;
+
+    return true;
+}
+
+uint64_t bitcoin_rpc_client::receive_estimated_fee()
+{
+   static const auto confirmation_target_blocks = 6;
+
+   const auto body = std::string("{\"jsonrpc\": \"1.0\", \"id\":\"estimated_feerate\", \"method\": \"estimatesmartfee\", \"params\": [") +
+                     std::to_string(confirmation_target_blocks) + std::string("] }");
+
+   const auto reply = send_post_request( body );
+
+   if( reply.status != 200 )
+      return 0;
+
+   std::stringstream ss( std::string( reply.body.begin(), reply.body.end() ) );
+   boost::property_tree::ptree json;
+   boost::property_tree::read_json( ss, json );
+
+   if( json.count( "result" ) )
+      if ( json.get_child( "result" ).count( "feerate" ) ) {
+         auto feerate_str = json.get_child( "result" ).get_child( "feerate" ).get_value<std::string>();
+         feerate_str.erase( std::remove( feerate_str.begin(), feerate_str.end(), '.' ), feerate_str.end() );
+         return std::stoll( feerate_str );
+      }
+   return 0;
+}
+
+void bitcoin_rpc_client::send_btc_tx( const std::string& tx_hex )
+{
+   const auto body = std::string("{\"jsonrpc\": \"1.0\", \"id\":\"send_tx\", \"method\": \"sendrawtransaction\", \"params\": [") +
+                     std::string("\"") + tx_hex + std::string("\"") + std::string("] }");
+
+   const auto reply = send_post_request( body );
+
+   if( reply.body.empty() )
+      return;
+
+   std::string reply_str( reply.body.begin(), reply.body.end() );
+
+   std::stringstream ss(reply_str);
+   boost::property_tree::ptree json;
+   boost::property_tree::read_json( ss, json );
+
+   if( reply.status == 200 ) {
+      idump(( tx_hex ));
+      return;
+   } else if( json.count( "error" ) && !json.get_child( "error" ).empty() ) {
+      const auto error_code = json.get_child( "error" ).get_child( "code" ).get_value<int>();
+      if( error_code == -27 ) // transaction already in block chain
+         return;
+
+      wlog( "BTC tx is not sent! Reply: ${msg}", ("msg", reply_str) );
+   }
+}
+
+bool bitcoin_rpc_client::connection_is_not_defined() const
+{
+   return ip.empty() || rpc_port == 0 || user.empty() || password.empty();
+}
+
+fc::http::reply bitcoin_rpc_client::send_post_request( std::string body )
+{
+   fc::http::connection conn;
+   conn.connect_to( fc::ip::endpoint( fc::ip::address( ip ), rpc_port ) );
+
+   const auto url = "http://" + ip + ":" + std::to_string( rpc_port );
+
+   return conn.request( "POST", url, body, fc::http::headers{authorization} );
+}
+
+}

libraries/plugins/peerplays_sidechain/sidechain/network/include/sidechain/network/bitcoin_rpc_client.hpp

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <string>
+#include <fc/network/http/connection.hpp>
+
+namespace sidechain {
+
+class bitcoin_rpc_client
+{
+
+public:
+
+   bitcoin_rpc_client( std::string _ip, uint32_t _rpc, std::string _user, std::string _password) ;
+
+   std::string receive_full_block( const std::string& block_hash );
+
+   int32_t receive_confirmations_tx( const std::string& tx_hash );
+
+   bool receive_mempool_entry_tx( const std::string& tx_hash );
+
+   uint64_t receive_estimated_fee();
+
+   void send_btc_tx( const std::string& tx_hex );
+
+   bool connection_is_not_defined() const;
+
+private:
+
+   fc::http::reply send_post_request( std::string body );
+
+   std::string ip;
+   uint32_t rpc_port;
+   std::string user;
+   std::string password;
+
+   fc::http::header authorization;
+
+};
+
+}

libraries/plugins/peerplays_sidechain/sidechain/network/include/sidechain/network/sidechain_net_manager.hpp

@@ -0,0 +1,52 @@
+#pragma once
+
+#include <sidechain/network/zmq_listener.hpp>
+#include <sidechain/network/bitcoin_rpc_client.hpp>
+#include <graphene/chain/database.hpp>
+
+namespace sidechain {
+
+class sidechain_net_manager 
+{
+
+public:
+
+   sidechain_net_manager() {};
+
+   sidechain_net_manager( graphene::chain::database* _db, std::string _ip, 
+                         uint32_t _zmq, uint32_t _rpc, std::string _user, std::string _password );
+
+   ~sidechain_net_manager() { db = nullptr; }
+
+   void initialize_manager( graphene::chain::database* _db, std::string _ip, 
+                           uint32_t _zmq, uint32_t _rpc, std::string _user, std::string _password );
+
+   void update_tx_infos( const std::string& block_hash );
+
+   void update_tx_approvals();
+
+   void update_estimated_fee();
+
+   void send_btc_tx( const sidechain::bitcoin_transaction& trx );
+
+   bool connection_is_not_defined() const;
+
+private:
+
+   void handle_block( const std::string& block_hash );
+
+   std::vector<info_for_vin> extract_info_from_block( const std::string& _block );
+
+   void update_transaction_status( std::vector<fc::sha256> trx_for_check );
+
+   std::set<fc::sha256> get_valid_vins( const std::string tx_hash );
+
+   inline uint64_t parse_amount(std::string raw);
+
+   std::unique_ptr<zmq_listener> listener;
+   std::unique_ptr<bitcoin_rpc_client> bitcoin_client;
+   graphene::chain::database* db;
+
+};
+
+}

libraries/plugins/peerplays_sidechain/sidechain/network/include/sidechain/network/zmq_listener.hpp

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include <fc/signals.hpp>
+
+#include <zmq.hpp>
+
+namespace sidechain {
+
+class zmq_listener
+{
+
+public:
+
+   zmq_listener( std::string _ip, uint32_t _zmq );
+
+   bool connection_is_not_defined() const { return zmq_port == 0; }
+
+   fc::signal<void( const std::string& )> block_received;
+
+private:
+
+   void handle_zmq();
+   std::vector<zmq::message_t> receive_multipart();
+
+   std::string ip;
+   uint32_t zmq_port;
+
+   zmq::context_t ctx;
+   zmq::socket_t socket;
+};
+
+}

libraries/plugins/peerplays_sidechain/sidechain/network/sidechain_net_manager.cpp

@@ -0,0 +1,202 @@
+#include <sidechain/network/sidechain_net_manager.hpp>
+#include <sidechain/serialize.hpp>
+#include <sidechain/sidechain_parameters.hpp>
+
+#include <fc/network/http/connection.hpp>
+#include <fc/network/ip.hpp>
+
+#include <thread>
+
+#include <boost/property_tree/ptree.hpp>
+#include <boost/property_tree/json_parser.hpp>
+
+#include <graphene/chain/bitcoin_address_object.hpp>
+
+namespace sidechain {
+
+sidechain_net_manager::sidechain_net_manager( graphene::chain::database* _db, std::string _ip, 
+                                             uint32_t _zmq, uint32_t _rpc, std::string _user, std::string _password )
+{
+   initialize_manager(_db, _ip, _zmq, _rpc, _user, _password );
+}
+
+void sidechain_net_manager::initialize_manager( graphene::chain::database* _db, std::string _ip, 
+                                             uint32_t _zmq, uint32_t _rpc, std::string _user, std::string _password )
+{
+   fc::http::connection conn;
+   try {
+      conn.connect_to( fc::ip::endpoint( fc::ip::address( _ip ), _rpc ) );
+   } catch ( fc::exception e ) {
+      elog( "No BTC node running at ${ip} or wrong rpc port: ${port}", ("ip", _ip) ("port", _rpc) );
+      FC_ASSERT( false );
+   }
+
+   listener = std::unique_ptr<zmq_listener>( new zmq_listener( _ip, _zmq ) );
+   bitcoin_client = std::unique_ptr<bitcoin_rpc_client>( new bitcoin_rpc_client( _ip, _rpc, _user, _password ) );
+   db = _db;
+
+   listener->block_received.connect([this]( const std::string& block_hash ) {
+      std::thread( &sidechain_net_manager::handle_block, this, block_hash ).detach();
+   } );
+
+   db->send_btc_tx.connect([this]( const sidechain::bitcoin_transaction& trx ) {
+      std::thread( &sidechain_net_manager::send_btc_tx, this, trx ).detach();
+   } );
+}
+
+void sidechain_net_manager::update_tx_infos( const std::string& block_hash )
+{
+   std::string block = bitcoin_client->receive_full_block( block_hash );
+   if( block != "" ) {
+      const auto& vins = extract_info_from_block( block );
+      const auto& addr_idx = db->get_index_type<bitcoin_address_index>().indices().get<by_address>();
+      for( const auto& v : vins ) {
+         const auto& addr_itr = addr_idx.find( v.address );
+         FC_ASSERT( addr_itr != addr_idx.end() );
+         db->i_w_info.insert_info_for_vin( prev_out{ v.out.hash_tx, v.out.n_vout, v.out.amount }, v.address, addr_itr->address.get_witness_script() );
+      }
+   }
+}
+
+void sidechain_net_manager::update_tx_approvals()
+{
+   std::vector<fc::sha256> trx_for_check;
+   const auto& confirmations_num = db->get_sidechain_params().confirmations_num;
+
+   db->bitcoin_confirmations.safe_for<by_hash>([&]( btc_tx_confirmations_index::iterator itr_b, btc_tx_confirmations_index::iterator itr_e ){
+      for(auto iter = itr_b; iter != itr_e; iter++) {
+         db->bitcoin_confirmations.modify<by_hash>( iter->transaction_id, [&]( bitcoin_transaction_confirmations& obj ) {
+            obj.count_block++;
+         });
+
+         if( iter->count_block == confirmations_num ) {
+            trx_for_check.push_back( iter->transaction_id );
+         }
+      }
+   });
+
+   update_transaction_status( trx_for_check );
+
+}
+
+void sidechain_net_manager::update_estimated_fee()
+{
+   db->estimated_feerate = bitcoin_client->receive_estimated_fee();
+}
+
+void sidechain_net_manager::send_btc_tx( const sidechain::bitcoin_transaction& trx )
+{
+   std::set<fc::sha256> valid_vins;
+   for( const auto& v : trx.vin ) {
+      valid_vins.insert( v.prevout.hash );
+   }
+   db->bitcoin_confirmations.insert( bitcoin_transaction_confirmations( trx.get_txid(), valid_vins ) );
+
+   FC_ASSERT( !bitcoin_client->connection_is_not_defined() );
+   const auto tx_hex = fc::to_hex( pack( trx ) );
+
+   bitcoin_client->send_btc_tx( tx_hex );
+}
+
+bool sidechain_net_manager::connection_is_not_defined() const
+{
+   return listener->connection_is_not_defined() && bitcoin_client->connection_is_not_defined();
+}
+
+void sidechain_net_manager::handle_block( const std::string& block_hash )
+{
+   update_tx_approvals();
+   update_estimated_fee();
+   update_tx_infos( block_hash );
+}
+
+std::vector<info_for_vin> sidechain_net_manager::extract_info_from_block( const std::string& _block )
+{
+   std::stringstream ss( _block );
+   boost::property_tree::ptree block;
+   boost::property_tree::read_json( ss, block );
+
+   std::vector<info_for_vin> result;
+
+   const auto& addr_idx = db->get_index_type<bitcoin_address_index>().indices().get<by_address>();
+
+   for (const auto& tx_child : block.get_child("tx")) {
+      const auto& tx = tx_child.second;
+
+      for ( const auto& o : tx.get_child("vout") ) {
+         const auto script = o.second.get_child("scriptPubKey");
+
+         if( !script.count("addresses") ) continue;
+
+         for (const auto& addr : script.get_child("addresses")) { // in which cases there can be more addresses?
+            const auto address_base58 = addr.second.get_value<std::string>();
+
+            if( !addr_idx.count( address_base58 ) ) continue;
+
+            info_for_vin vin;
+            vin.out.hash_tx = tx.get_child("txid").get_value<std::string>();
+            vin.out.amount = parse_amount( o.second.get_child( "value" ).get_value<std::string>() );
+            vin.out.n_vout = o.second.get_child( "n" ).get_value<uint32_t>();
+            vin.address = address_base58;
+            result.push_back( vin );
+         }
+      }
+   }
+
+   return result;
+}
+
+std::set<fc::sha256> sidechain_net_manager::get_valid_vins( const std::string tx_hash )
+{
+   const auto& confirmations_obj = db->bitcoin_confirmations.find<sidechain::by_hash>( fc::sha256( tx_hash ) );
+   FC_ASSERT( confirmations_obj.valid() );
+
+   std::set<fc::sha256> valid_vins;
+   for( const auto& v : confirmations_obj->valid_vins ) {
+      auto confirmations = bitcoin_client->receive_confirmations_tx( v.str() );
+      if( confirmations == 0 ) {
+         continue;
+      }
+      valid_vins.insert( v );
+   }
+   return valid_vins;
+}
+
+void sidechain_net_manager::update_transaction_status( std::vector<fc::sha256> trx_for_check )
+{
+   const auto& confirmations_num = db->get_sidechain_params().confirmations_num;
+
+   for( const auto& trx : trx_for_check ) {
+      auto confirmations = bitcoin_client->receive_confirmations_tx( trx.str() );
+      db->bitcoin_confirmations.modify<by_hash>( trx, [&]( bitcoin_transaction_confirmations& obj ) {
+         obj.count_block = confirmations;
+      });
+
+      if( confirmations >= confirmations_num ) {
+         db->bitcoin_confirmations.modify<by_hash>( trx, [&]( bitcoin_transaction_confirmations& obj ) {
+            obj.confirmed = true;
+         });
+
+      } else if( confirmations == 0 ) {
+         auto is_in_mempool =  bitcoin_client->receive_mempool_entry_tx( trx.str() );
+
+         std::set<fc::sha256> valid_vins;
+         if( !is_in_mempool ) {
+            valid_vins = get_valid_vins( trx.str() );
+         }
+
+         db->bitcoin_confirmations.modify<by_hash>( trx, [&]( bitcoin_transaction_confirmations& obj ) {
+            obj.missing = !is_in_mempool;
+            obj.valid_vins = valid_vins;
+         });
+      }
+   }
+}
+
+// Removes dot from amount output: "50.00000000"
+inline uint64_t sidechain_net_manager::parse_amount(std::string raw) {
+    raw.erase(std::remove(raw.begin(), raw.end(), '.'), raw.end());
+    return std::stoll(raw);
+}
+
+}

libraries/plugins/peerplays_sidechain/sidechain/network/zmq_listener.cpp

@@ -0,0 +1,45 @@
+#include <sidechain/network/zmq_listener.hpp>
+#include <boost/algorithm/hex.hpp>
+#include <thread>
+
+namespace sidechain {
+
+zmq_listener::zmq_listener( std::string _ip, uint32_t _zmq ): ip( _ip ), zmq_port( _zmq ), ctx( 1 ), socket( ctx, ZMQ_SUB )
+{
+   std::thread( &zmq_listener::handle_zmq, this ).detach();
+}
+
+std::vector<zmq::message_t> zmq_listener::receive_multipart()
+{
+   std::vector<zmq::message_t> msgs;
+
+   int32_t more;
+   size_t more_size = sizeof( more );
+   while ( true ) {
+      zmq::message_t msg;
+      socket.recv( &msg, 0 );
+      socket.getsockopt( ZMQ_RCVMORE, &more, &more_size );
+
+      if ( !more )
+         break;
+      msgs.push_back( std::move(msg) );
+   }
+
+   return msgs;
+}
+
+void zmq_listener::handle_zmq()
+{
+   socket.setsockopt( ZMQ_SUBSCRIBE, "hashblock", 0 );
+   socket.connect( "tcp://" + ip + ":" + std::to_string( zmq_port ) );
+
+   while ( true ) {
+      auto msg = receive_multipart();
+      const auto header = std::string( static_cast<char*>( msg[0].data() ), msg[0].size() );
+      const auto hash = boost::algorithm::hex( std::string( static_cast<char*>( msg[1].data() ), msg[1].size() ) );
+
+      block_received( hash );
+   }
+}
+
+}

libraries/plugins/peerplays_sidechain/sidechain/primary_wallet_vout_manager.cpp

@@ -0,0 +1,136 @@
+#include <sidechain/primary_wallet_vout_manager.hpp>
+#include <graphene/chain/database.hpp>
+#include <graphene/chain/primary_wallet_vout_object.hpp>
+#include <graphene/chain/config.hpp>
+
+
+namespace sidechain {
+
+bool primary_wallet_vout_manager::is_max_vouts() const
+{
+   const auto& PW_vout_idx = db.get_index_type<graphene::chain::primary_wallet_vout_index>().indices().get< graphene::chain::by_id >();
+   return !( ( PW_vout_idx.size() - 1 ) <= db.get_sidechain_params().maximum_unconfirmed_vouts );
+}
+
+fc::optional< primary_wallet_vout_object > primary_wallet_vout_manager::get_latest_unused_vout() const
+{
+   const auto& PW_vout_idx = db.get_index_type<graphene::chain::primary_wallet_vout_index>().indices().get< graphene::chain::by_id >();
+   auto itr = PW_vout_idx.end();
+   FC_ASSERT( itr != PW_vout_idx.begin() );
+
+   itr--;
+   if( itr->used )
+      return fc::optional< primary_wallet_vout_object >();
+   return fc::optional< primary_wallet_vout_object > (*itr);
+}
+
+fc::optional< primary_wallet_vout_object > primary_wallet_vout_manager::get_vout( fc::sha256 hash_id ) const
+{
+   const auto& PW_vout_by_hash_id = db.get_index_type<graphene::chain::primary_wallet_vout_index>().indices().get< graphene::chain::by_hash_id >();
+   const auto& itr_hash_id = PW_vout_by_hash_id.find( hash_id );
+   if( itr_hash_id == PW_vout_by_hash_id.end() )
+      return fc::optional< primary_wallet_vout_object >();
+   return fc::optional< primary_wallet_vout_object >( *itr_hash_id );
+}
+
+void primary_wallet_vout_manager::create_new_vout( const sidechain::prev_out& out )
+{
+   const auto& next_pw_id = db.get_index_type<graphene::chain::primary_wallet_vout_index>().get_next_id().instance();
+   db.create<primary_wallet_vout_object>([&]( primary_wallet_vout_object& obj ) {
+      obj.vout = out;
+      obj.hash_id = create_hash_id( out.hash_tx, out.n_vout, next_pw_id );
+      obj.confirmed = false;
+      obj.used = false;
+   });
+}
+
+void primary_wallet_vout_manager::delete_vouts_after( fc::sha256 hash_id )
+{
+   const auto& PW_vout_by_id = db.get_index_type<graphene::chain::primary_wallet_vout_index>().indices().get< graphene::chain::by_id >();
+   auto vout_id = get_vout_id( hash_id );
+   if( !vout_id.valid() )
+      return;
+
+   auto itr = PW_vout_by_id.find( *vout_id );
+   itr++;
+
+   while( itr != PW_vout_by_id.end() )
+   {
+      auto temp = itr;
+      itr++;
+      db.remove( *temp );
+   }
+}
+
+void primary_wallet_vout_manager::confirm_vout( fc::sha256 hash_id )
+{
+   const auto& PW_vout_by_id = db.get_index_type<graphene::chain::primary_wallet_vout_index>().indices().get< graphene::chain::by_id >();
+   auto vout_id = get_vout_id( hash_id );
+   FC_ASSERT( vout_id.valid() );
+
+   auto itr = PW_vout_by_id.find( *vout_id );
+
+   db.modify(*itr, [&]( primary_wallet_vout_object& PW_vout ) {
+      PW_vout.confirmed = true;
+   });
+
+   if( itr != PW_vout_by_id.begin() ){
+      itr--;
+      FC_ASSERT( itr->confirmed == true );
+      db.remove(*itr);
+   }
+}
+
+void primary_wallet_vout_manager::mark_as_used_vout( fc::sha256 hash_id )
+{
+   const auto& PW_vout_by_id = db.get_index_type<graphene::chain::primary_wallet_vout_index>().indices().get< graphene::chain::by_id >();
+   auto vout_id = get_vout_id( hash_id );
+   FC_ASSERT( vout_id.valid() );
+
+   auto itr = PW_vout_by_id.find( *vout_id );
+
+   db.modify(*itr, [&]( primary_wallet_vout_object& PW_vout ) {
+      PW_vout.used = true;
+   });
+
+   if( itr != PW_vout_by_id.begin() ){
+      itr--;
+      FC_ASSERT( itr->used == true );
+   }
+}
+
+void primary_wallet_vout_manager::mark_as_unused_vout( fc::sha256 hash_id )
+{
+   const auto& PW_vout_by_id = db.get_index_type<graphene::chain::primary_wallet_vout_index>().indices().get< graphene::chain::by_id >();
+   auto vout_id = get_vout_id( hash_id );
+   FC_ASSERT( vout_id.valid() );
+
+   auto itr = PW_vout_by_id.find( *vout_id );
+
+   db.modify(*itr, [&]( primary_wallet_vout_object& PW_vout ) {
+      PW_vout.used = false;
+   });
+}
+
+fc::optional< graphene::chain::primary_wallet_vout_id_type > primary_wallet_vout_manager::get_vout_id( fc::sha256 hash_id ) const
+{
+   const auto& PW_vout_by_hash_id = db.get_index_type<graphene::chain::primary_wallet_vout_index>().indices().get< graphene::chain::by_hash_id >();
+   const auto& itr_hash_id = PW_vout_by_hash_id.find( hash_id );
+   if( itr_hash_id == PW_vout_by_hash_id.end() )
+      return fc::optional< graphene::chain::primary_wallet_vout_id_type >();
+   return fc::optional< graphene::chain::primary_wallet_vout_id_type >( itr_hash_id->get_id() );
+}
+
+fc::sha256 primary_wallet_vout_manager::create_hash_id( const std::string& hash_tx, const uint32_t& n_vout, const uint64_t& id ) const
+{
+   std::stringstream ss;
+   ss << std::hex << id;
+   std::string id_hex = std::string( 16 - ss.str().size(), '0' ) + ss.str();
+
+   std::string hash_str = fc::sha256::hash( hash_tx + std::to_string( n_vout ) ).str();
+   std::string final_hash_id = std::string( hash_str.begin(), hash_str.begin() + 48 ) + id_hex;
+
+   return fc::sha256( final_hash_id );
+}
+
+}

libraries/plugins/peerplays_sidechain/sidechain/segwit_addr.cpp

@@ -0,0 +1,81 @@
+/* Copyright (c) 2017 Pieter Wuille
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <sidechain/segwit_addr.hpp>
+#include <sidechain/bech32.hpp>
+
+namespace
+{
+
+typedef std::vector<uint8_t> data;
+
+/** Convert from one power-of-2 number base to another. */
+template<int frombits, int tobits, bool pad>
+bool convertbits(data& out, const data& in) {
+    int acc = 0;
+    int bits = 0;
+    const int maxv = (1 << tobits) - 1;
+    const int max_acc = (1 << (frombits + tobits - 1)) - 1;
+    for (size_t i = 0; i < in.size(); ++i) {
+        int value = in[i];
+        acc = ((acc << frombits) | value) & max_acc;
+        bits += frombits;
+        while (bits >= tobits) {
+            bits -= tobits;
+            out.push_back((acc >> bits) & maxv);
+        }
+    }
+    if (pad) {
+        if (bits) out.push_back((acc << (tobits - bits)) & maxv);
+    } else if (bits >= frombits || ((acc << (tobits - bits)) & maxv)) {
+        return false;
+    }
+    return true;
+}
+
+}
+
+namespace sidechain { namespace segwit_addr {
+
+/** Decode a SegWit address. */
+std::pair<int, data> decode(const std::string& hrp, const std::string& addr) {
+    std::pair<std::string, data> dec = sidechain::bech32::Decode(addr);
+    if (dec.first != hrp || dec.second.size() < 1) return std::make_pair(-1, data());
+    data conv;
+    if (!convertbits<5, 8, false>(conv, data(dec.second.begin() + 1, dec.second.end())) ||
+        conv.size() < 2 || conv.size() > 40 || dec.second[0] > 16 || (dec.second[0] == 0 &&
+        conv.size() != 20 && conv.size() != 32)) {
+        return std::make_pair(-1, data());
+    }
+    return std::make_pair(dec.second[0], conv);
+}
+
+/** Encode a SegWit address. */
+std::string encode(const std::string& hrp, int witver, const data& witprog) {
+    data enc;
+    enc.push_back(witver);
+    convertbits<8, 5, true>(enc, witprog);
+    std::string ret = sidechain::bech32::Encode(hrp, enc);
+    if (decode(hrp, ret).first == -1) return "";
+    return ret;
+}
+
+} }

libraries/plugins/peerplays_sidechain/sidechain/sidechain_condensing_tx.cpp

@@ -0,0 +1,107 @@
+#include <sidechain/sidechain_condensing_tx.hpp>
+
+namespace sidechain {
+
+sidechain_condensing_tx::sidechain_condensing_tx( const std::vector<info_for_vin>& vin_info, const std::vector<info_for_vout>& vout_info )
+{
+   create_vins_for_condensing_tx( vin_info );
+   create_vouts_for_condensing_tx( vout_info );
+}
+
+void sidechain_condensing_tx::create_pw_vin( const info_for_vin& vin_info, bool front )
+{
+   bytes witness_script_temp = {0x22};
+   witness_script_temp.insert( witness_script_temp.end(), vin_info.script.begin(), vin_info.script.end() );
+   tb.add_in( payment_type::P2WSH, fc::sha256( vin_info.out.hash_tx ), vin_info.out.n_vout, witness_script_temp, front );
+
+   amount_vins += vin_info.out.amount;
+}
+
+void sidechain_condensing_tx::create_pw_vout( const uint64_t amount, const bytes& wit_script_out, bool front )
+{
+   tb.add_out( payment_type::P2WSH, amount, bytes(wit_script_out.begin() + 2, wit_script_out.end()), front );
+}
+
+void sidechain_condensing_tx::create_vins_for_condensing_tx( const std::vector<info_for_vin>& vin_info )
+{
+   for( const auto& info : vin_info ) {
+      bytes witness_script_temp = {0x22};
+      witness_script_temp.insert( witness_script_temp.end(), info.script.begin(), info.script.end() );
+      tb.add_in( payment_type::P2SH_WSH, fc::sha256( info.out.hash_tx ), info.out.n_vout, witness_script_temp );
+      amount_vins += info.out.amount;
+      count_transfer_vin++;
+   }
+}
+
+void sidechain_condensing_tx::create_vouts_for_condensing_tx( const std::vector<info_for_vout>& vout_info )
+{
+   for( const auto& info : vout_info ) {
+      tb.add_out_all_type( info.amount, info.address );
+      amount_transfer_to_bitcoin += info.amount;
+      count_transfer_vout++;
+   }
+}
+
+void sidechain_condensing_tx::create_vouts_for_witness_fee( const accounts_keys& witness_active_keys, bool front )
+{
+   for( auto& key : witness_active_keys ) {
+      tb.add_out( payment_type::P2PK, 0, key.second, front );
+      count_witness_vout++;
+   }
+}
+
+uint64_t sidechain_condensing_tx::get_estimate_tx_size( bitcoin_transaction tx, size_t number_witness )
+{
+   bytes temp_sig(72, 0x00);
+   bytes temp_key(34, 0x00);
+   bytes temp_script(3, 0x00);
+   for(size_t i = 0; i < number_witness; i++) {
+      temp_script.insert(temp_script.begin() + 1, temp_key.begin(), temp_key.end());
+   }
+
+   std::vector<bytes> temp_scriptWitness = { {},{temp_sig},{temp_sig},{temp_sig},{temp_sig},{temp_sig},{temp_script} };
+   for( auto& vin : tx.vin ) {
+      vin.scriptWitness = temp_scriptWitness;
+   }
+
+   return tx.get_vsize();
+}
+
+void sidechain_condensing_tx::subtract_fee( const uint64_t& fee, const uint16_t& witnesses_percentage )
+{
+   bitcoin_transaction tx = get_transaction();
+
+   uint64_t fee_size = fee / ( count_transfer_vin + count_transfer_vout );
+   if( fee % ( count_transfer_vin + count_transfer_vout ) != 0 ) {
+      fee_size += 1;
+   }
+
+   bool is_pw_vin = tx.vout.size() > ( count_witness_vout + count_transfer_vout );
+   if( is_pw_vin ) {
+      tx.vout[0].value = tx.vout[0].value - fee_size * count_transfer_vin;
+   }
+
+   uint64_t fee_witnesses = 0;
+   size_t offset = is_pw_vin ? 1 + count_witness_vout : count_witness_vout;
+   for( ; offset < tx.vout.size(); offset++ ) {
+      uint64_t amount_without_fee_size = tx.vout[offset].value - fee_size;
+      uint64_t amount_fee_witness = ( amount_without_fee_size * witnesses_percentage ) / GRAPHENE_100_PERCENT;
+      tx.vout[offset].value = amount_without_fee_size;
+      tx.vout[offset].value -= amount_fee_witness;
+      fee_witnesses += amount_fee_witness;
+   }
+
+   if( count_witness_vout > 0 ) {
+      uint64_t fee_witness = fee_witnesses / count_witness_vout;
+      size_t limit = is_pw_vin ? 1 + count_witness_vout : count_witness_vout;
+      size_t offset = is_pw_vin ? 1 : 0;
+      FC_ASSERT( fee_witness > 0 );
+      for( ; offset < limit; offset++ ) {
+         tx.vout[offset].value += fee_witness;
+      }
+   }
+
+   tb = std::move( bitcoin_transaction_builder( tx ) );
+}
+
+}

libraries/plugins/peerplays_sidechain/sidechain/sidechain_proposal_checker.cpp

@@ -0,0 +1,214 @@
+#include <sidechain/sidechain_proposal_checker.hpp>
+#include <sidechain/sidechain_condensing_tx.hpp>
+
+#include <graphene/chain/database.hpp>
+#include <graphene/chain/primary_wallet_vout_object.hpp>
+#include <graphene/chain/bitcoin_address_object.hpp>
+#include <graphene/chain/proposal_object.hpp>
+#include <graphene/chain/bitcoin_transaction_object.hpp>
+#include <graphene/chain/info_for_used_vin_object.hpp>
+
+namespace sidechain {
+
+bool sidechain_proposal_checker::check_bitcoin_transaction_send_operation( const bitcoin_transaction_send_operation& op )
+{
+   bool info_for_pw_vin = check_info_for_pw_vin( op.pw_vin );
+   bool info_for_vins = check_info_for_vins( op.vins );
+   bool info_for_vouts = check_info_for_vouts( op.vouts );
+   bool transaction = check_transaction( op );
+
+   return info_for_pw_vin && info_for_vins && info_for_vouts && transaction;
+}
+
+bool sidechain_proposal_checker::check_reuse_pw_vin( const fc::sha256& pw_vin )
+{
+   const auto& pw_vin_status = pw_vin_ident.insert( pw_vin );
+   if( !pw_vin_status.second ) {
+      return false;
+   }
+   return true;
+}
+
+bool sidechain_proposal_checker::check_reuse_user_vins( const std::vector<fc::sha256>& user_vin_identifiers )
+{
+   for( const auto& vin : user_vin_identifiers ) {
+      const auto& user_vin_status = user_vin_ident.insert( vin );
+      if( !user_vin_status.second ) {
+         return false;
+      }
+   }
+   return true;
+}
+
+bool sidechain_proposal_checker::check_reuse_vouts( const std::vector<info_for_vout_id_type>& user_vout_ids )
+{
+   for( const auto& vout : user_vout_ids ) {
+      const auto& user_vout_status = vout_ids.insert( vout );
+      if( !user_vout_status.second ) {
+         return false;
+      }
+   }
+   return true;
+}
+
+bool sidechain_proposal_checker::check_reuse( const operation& op )
+{
+   fc::sha256 pw_vin_identifier;
+   std::vector<fc::sha256> user_vin_identifiers;
+   std::vector<info_for_vout_id_type> user_vout_ids;
+
+   auto get_bto_tx_info = [ & ]( fc::sha256 trx_id ) {
+      const auto& bto_itr_idx = db.get_index_type<bitcoin_transaction_index>().indices().get<graphene::chain::by_transaction_id>();
+      const auto& bto_itr = bto_itr_idx.find( trx_id );
+      if( bto_itr == bto_itr_idx.end() ) {
+         return false;
+      }
+      pw_vin_identifier = bto_itr->pw_vin;
+      user_vout_ids = bto_itr->vouts;
+      user_vin_identifiers = bto_itr->vins;
+
+      return true;
+   };
+
+   if( op.which() == operation::tag<bitcoin_transaction_send_operation>::value ) {
+      bitcoin_transaction_send_operation btc_tx_send_op = op.get<bitcoin_transaction_send_operation>();
+      pw_vin_identifier = btc_tx_send_op.pw_vin.identifier;
+      user_vout_ids = btc_tx_send_op.vouts;
+      for( const auto& vin : btc_tx_send_op.vins ) {
+         user_vin_identifiers.push_back( vin.identifier );
+      }
+   } else if ( op.which() == operation::tag<bitcoin_issue_operation>::value ) {
+      bitcoin_issue_operation btc_issue_op = op.get<bitcoin_issue_operation>();
+      for( const auto& id : btc_issue_op.transaction_ids ) {
+         if ( !get_bto_tx_info( id ) )
+            return false;
+      }
+   } else if ( op.which() == operation::tag<bitcoin_transaction_revert_operation>::value ) {
+      bitcoin_transaction_revert_operation btc_tx_revert_op = op.get<bitcoin_transaction_revert_operation>();
+      for( auto trx_info: btc_tx_revert_op.transactions_info ) {
+         if ( !get_bto_tx_info( trx_info.transaction_id ) )
+            return false;
+      }
+   }
+
+   return check_reuse_pw_vin( pw_vin_identifier ) &&
+          check_reuse_user_vins( user_vin_identifiers ) &&
+          check_reuse_vouts( user_vout_ids );
+}
+
+bool sidechain_proposal_checker::check_info_for_pw_vin( const info_for_vin& info_for_vin )
+{
+   const auto& prevout = db.pw_vout_manager.get_vout( info_for_vin.identifier );
+   const auto& pw_address = db.get_latest_PW().address;
+   if( !prevout.valid() || info_for_vin.out != prevout->vout ||
+       info_for_vin.address != pw_address.get_address() || info_for_vin.script != pw_address.get_witness_script() ) {
+      return false;
+   }
+   return true;
+}
+
+bool sidechain_proposal_checker::check_info_for_vins( const std::vector<info_for_vin>& info_for_vins )
+{
+   for( const auto& vin : info_for_vins ) {
+      const auto& v = db.i_w_info.find_info_for_vin( vin.identifier );
+      if( !v.valid() || *v != vin ) {
+         return false;
+      }
+   }
+   return true;
+}
+
+bool sidechain_proposal_checker::check_info_for_vouts( const std::vector<info_for_vout_id_type>& info_for_vout_ids )
+{
+   const auto& info_for_vout_idx = db.get_index_type<info_for_vout_index>().indices().get<graphene::chain::by_id>();
+   for( const auto& id : info_for_vout_ids ) {
+      const auto& itr = info_for_vout_idx.find( id );
+      if( itr == info_for_vout_idx.end() ) {
+         return false;
+      }
+   }
+   return true;
+}
+
+bool sidechain_proposal_checker::check_transaction( const bitcoin_transaction_send_operation& btc_trx_op )
+{
+   std::vector<info_for_vout> info_vouts;
+   const auto& info_for_vout_idx = db.get_index_type<info_for_vout_index>().indices().get<graphene::chain::by_id>();
+   for( const auto& vout_id : btc_trx_op.vouts ) {
+      const auto& vout_itr = info_for_vout_idx.find( vout_id );
+      if( vout_itr == info_for_vout_idx.end() ) {
+         return false;
+      }
+      info_vouts.push_back( *vout_itr );
+   }
+
+   const auto& temp_full_tx = db.create_btc_transaction( btc_trx_op.vins, info_vouts, btc_trx_op.pw_vin );
+
+   if( temp_full_tx.first != btc_trx_op.transaction || temp_full_tx.second != btc_trx_op.fee_for_size ) {
+      return false;
+   }
+
+   return true;
+}
+
+bool sidechain_proposal_checker::check_witness_opportunity_to_approve( const witness_object& current_witness, const proposal_object& proposal )
+{
+   auto is_active_witness = [ & ]() {
+      return db.get_global_properties().active_witnesses.find( current_witness.id ) != db.get_global_properties().active_witnesses.end();
+   };
+
+   // Checks can witness approve this proposal or not
+   auto does_the_witness_have_authority = [ & ]() {
+      const auto& accounts_index = db.get_index_type<account_index>().indices().get<graphene::chain::by_id>();
+      auto account_pBTC_issuer = accounts_index.find( db.get_sidechain_account_id() );
+
+      return account_pBTC_issuer->owner.account_auths.count( current_witness.witness_account ) &&
+             !proposal.available_active_approvals.count( current_witness.witness_account );
+   };
+
+   return is_active_witness() && does_the_witness_have_authority();
+}
+
+bool sidechain_proposal_checker::check_witnesses_keys( const witness_object& current_witness, const proposal_object& proposal ) 
+{
+   bitcoin_transaction_send_operation op = proposal.proposed_transaction.operations.back().get<bitcoin_transaction_send_operation>();
+
+   auto vins = op.vins;
+   if( op.pw_vin.identifier.str().compare( 0, 48, SIDECHAIN_NULL_VIN_IDENTIFIER ) != 0 ) {
+      vins.insert( vins.begin(), op.pw_vin );
+   }
+
+   const auto& bitcoin_address_idx = db.get_index_type<bitcoin_address_index>().indices().get< by_address >();
+   
+   for ( const auto& info_vins : vins ) {
+      const auto& address_itr = bitcoin_address_idx.find( info_vins.address );
+      if ( address_itr != bitcoin_address_idx.end() ) {
+         const auto& witness_key = current_witness.signing_key;
+         const auto& witnesses_keys = address_itr->address.witnesses_keys;
+         const auto& witnesses_keys_itr = witnesses_keys.find( current_witness.witness_account );
+         if ( witnesses_keys_itr == witnesses_keys.end() || witnesses_keys_itr->second != witness_key ) {
+            return false;
+         }
+      }
+   }
+
+   return true;
+}
+
+bool sidechain_proposal_checker::check_bitcoin_transaction_revert_operation( const bitcoin_transaction_revert_operation& op )
+{
+   const auto& btc_trx_idx = db.get_index_type<bitcoin_transaction_index>().indices().get<by_transaction_id>();
+
+   for( auto trx_info: op.transactions_info )
+   {
+      auto value = db.bitcoin_confirmations.find<sidechain::by_hash>( trx_info.transaction_id );
+      if( !value.valid() ||
+          btc_trx_idx.find( value->transaction_id ) == btc_trx_idx.end() ||
+          trx_info != revert_trx_info( value->transaction_id, value->valid_vins ) )
+         return false;
+   }
+
+   return !op.transactions_info.empty();
+}
+
+}

libraries/plugins/peerplays_sidechain/sidechain/sign_bitcoin_transaction.cpp

@@ -0,0 +1,125 @@
+#include <sidechain/sign_bitcoin_transaction.hpp>
+#include <sidechain/serialize.hpp>
+
+namespace sidechain {
+
+fc::sha256 get_signature_hash( const bitcoin_transaction& tx, const bytes& scriptCode, int64_t amount,
+                               size_t in_index, int hash_type, bool is_witness )
+{
+   fc::datastream<size_t> ps;
+   if ( is_witness )
+      pack_tx_witness_signature( ps, scriptCode, tx, in_index, amount, hash_type );
+   else
+      pack_tx_signature( ps, scriptCode, tx, in_index, hash_type );
+
+   std::vector<char> vec( ps.tellp() );
+   if ( !vec.empty() ) {
+      fc::datastream<char*> ds( vec.data(), vec.size() );
+      if ( is_witness )
+         pack_tx_witness_signature( ds, scriptCode, tx, in_index, amount, hash_type );
+      else
+         pack_tx_signature( ds, scriptCode, tx, in_index, hash_type );
+   }
+
+   return fc::sha256::hash( fc::sha256::hash( vec.data(), vec.size() ) );
+}
+
+std::vector<char> privkey_sign( const bytes& privkey, const fc::sha256 &hash, const secp256k1_context_t* context_sign )
+{
+   bytes sig;
+   sig.resize( 72 );
+   int sig_len = sig.size();
+
+   FC_ASSERT( secp256k1_ecdsa_sign(
+      context_sign,
+      reinterpret_cast<unsigned char*>( hash.data() ),
+      reinterpret_cast<unsigned char*>( sig.data() ),
+      &sig_len,
+      reinterpret_cast<const unsigned char*>( privkey.data() ),
+      secp256k1_nonce_function_rfc6979,
+      nullptr ) ); // TODO: replace assert with exception
+
+   sig.resize( sig_len );
+
+   return sig;
+}
+
+std::vector<bytes> sign_witness_transaction_part( const bitcoin_transaction& tx, const std::vector<bytes>& redeem_scripts,
+                                                  const std::vector<uint64_t>& amounts, const bytes& privkey,
+                                                  const secp256k1_context_t* context_sign, int hash_type )
+{
+   FC_ASSERT( tx.vin.size() == redeem_scripts.size() && tx.vin.size() == amounts.size() );
+   FC_ASSERT( !privkey.empty() );
+    
+   std::vector< bytes > signatures;
+   for( size_t i = 0; i < tx.vin.size(); i++ ) {
+      const auto sighash = get_signature_hash( tx, redeem_scripts[i], static_cast<int64_t>( amounts[i] ), i, hash_type, true );
+      auto sig = privkey_sign( privkey, sighash, context_sign );
+      sig.push_back( static_cast<uint8_t>( hash_type ) );
+
+      signatures.push_back( sig );
+   }
+   return signatures;
+}
+
+void sign_witness_transaction_finalize( bitcoin_transaction& tx, const std::vector<bytes>& redeem_scripts )
+{
+   FC_ASSERT( tx.vin.size() == redeem_scripts.size() );
+    
+   for( size_t i = 0; i < tx.vin.size(); i++ ) {
+      tx.vin[i].scriptWitness.insert( tx.vin[i].scriptWitness.begin(), bytes() ); // Bitcoin workaround CHECKMULTISIG bug
+      tx.vin[i].scriptWitness.push_back( redeem_scripts[i] );
+   }
+}
+
+bool verify_sig( const bytes& sig, const bytes& pubkey, const bytes& msg, const secp256k1_context_t* context )
+{
+   std::vector<unsigned char> sig_temp( sig.begin(), sig.end() );
+   std::vector<unsigned char> pubkey_temp( pubkey.begin(), pubkey.end() );
+   std::vector<unsigned char> msg_temp( msg.begin(), msg.end() );
+
+   int result = secp256k1_ecdsa_verify( context, msg_temp.data(), sig_temp.data(), sig_temp.size(), pubkey_temp.data(), pubkey_temp.size() );
+   return result == 1;
+}
+
+std::vector<std::vector<bytes>> sort_sigs( const bitcoin_transaction& tx, const std::vector<bytes>& redeem_scripts,
+                                           const std::vector<uint64_t>& amounts, const secp256k1_context_t* context )
+{
+   FC_ASSERT( redeem_scripts.size() == amounts.size() );
+
+   using data = std::pair<size_t, bytes>;
+   struct comp {
+      bool operator() (const data& lhs, const data& rhs) const { return lhs.first < rhs.first; }
+   };
+
+   std::vector<std::vector<bytes>> new_stacks;
+
+   for( size_t i = 0; i < redeem_scripts.size(); i++ ) {
+      const std::vector<bytes>& keys = get_pubkey_from_redeemScript( redeem_scripts[i] );
+      const auto& sighash = get_signature_hash( tx, redeem_scripts[i], static_cast<int64_t>( amounts[i] ), i, 1, true ).str();
+      bytes sighash_temp( parse_hex( sighash ) );
+
+      std::vector<bytes> stack( tx.vin[i].scriptWitness );
+      std::vector<bool> marker( tx.vin[i].scriptWitness.size(), false );
+      std::set<data, comp> sigs;
+
+      for( size_t j = 0; j < keys.size(); j++ ) {     
+          for( size_t l = 0; l < stack.size(); l++ ) {
+             if( !verify_sig( stack[l], keys[j], sighash_temp, context ) || marker[l] )
+                continue;
+             sigs.insert(std::make_pair(j, stack[l]));
+             marker[l] = true;
+             break;
+          }
+      }
+
+      std::vector<bytes> temp_sig;
+      for( auto s : sigs ) {
+         temp_sig.push_back( s.second );
+      }
+      new_stacks.push_back( temp_sig );
+   }
+   return new_stacks;
+}
+
+}

libraries/plugins/peerplays_sidechain/sidechain/utils.cpp

@@ -0,0 +1,35 @@
+#include <sidechain/utils.hpp>
+
+namespace sidechain {
+
+bytes parse_hex( const std::string& str )
+{
+    bytes vec( str.size() / 2 );
+    fc::from_hex( str, vec.data(), vec.size() );
+    return vec;
+}
+
+std::vector<bytes> get_pubkey_from_redeemScript( bytes script )
+{
+   FC_ASSERT( script.size() >= 37 );
+
+   script.erase( script.begin() );
+   script.erase( script.end() - 2, script.end() );
+
+   std::vector<bytes> result;
+   uint64_t count = script.size() / 34;
+   for( size_t i = 0; i < count; i++ ) {
+      result.push_back( bytes( script.begin() + (34 * i) + 1, script.begin() + (34 * (i + 1)) ) );
+   }
+   return result;
+}
+
+bytes public_key_data_to_bytes( const fc::ecc::public_key_data& key )
+{
+    bytes result;
+    result.resize( key.size() );
+    std::copy( key.begin(), key.end(), result.begin() );
+    return result;
+}
+
+}

programs/witness_node/CMakeLists.txt

@@ -11,7 +11,7 @@ endif()
 
 # We have to link against graphene_debug_witness because deficiency in our API infrastructure doesn't allow plugins to be fully abstracted #246
 target_link_libraries( witness_node
-                       PRIVATE graphene_app graphene_account_history graphene_affiliate_stats graphene_market_history graphene_witness graphene_chain graphene_debug_witness graphene_bookie graphene_egenesis_full fc peerplays_sidechain ${CMAKE_DL_LIBS} ${PLATFORM_SPECIFIC_LIBS} )
+                       PRIVATE graphene_app graphene_account_history graphene_affiliate_stats graphene_market_history graphene_witness graphene_chain graphene_debug_witness graphene_bookie graphene_egenesis_full fc peerplays_sidechain sidechain_network ${CMAKE_DL_LIBS} ${PLATFORM_SPECIFIC_LIBS} )
 # also add dependencies to graphene_generate_genesis graphene_generate_uia_sharedrop_genesis if you want those plugins
 
 install( TARGETS