diff --git a/libraries/plugins/peerplays_sidechain/bitcoin/bitcoin_script.cpp b/libraries/plugins/peerplays_sidechain/bitcoin/bitcoin_script.cpp
index 4f2f2e8a..8bc30949 100644
--- a/libraries/plugins/peerplays_sidechain/bitcoin/bitcoin_script.cpp
+++ b/libraries/plugins/peerplays_sidechain/bitcoin/bitcoin_script.cpp
@@ -12,14 +12,23 @@ script_builder& script_builder::operator<<( op opcode )
    return *this;
 }
 
-script_builder& script_builder::operator<<( uint8_t number )
+script_builder& script_builder::operator<<( uint32_t number )
 {
-   FC_ASSERT( 0 <= number && number <= 16 );
-
-   if ( number == 0 )
+   if ( number == 0 ) {
       script.push_back( static_cast<uint8_t>( op::_0 ) );
-   else
+   } else if ( number <= 16) {
       script.push_back( static_cast<uint8_t>( op::_1 ) + number - 1 );
+   } else {
+      while (number) {
+         script.push_back(number & 0xff);
+         number >>= 8;
+      }
+      // - If the most significant byte is >= 0x80 and the value is positive, push a
+      // new zero-byte to make the significant byte < 0x80 again. So,  the result can
+      // be 5 bytes max.
+      if (script.back() & 0x80)
+          script.push_back(0);
+   }
 
    return *this;
 }
diff --git a/libraries/plugins/peerplays_sidechain/include/graphene/peerplays_sidechain/bitcoin/bitcoin_script.hpp b/libraries/plugins/peerplays_sidechain/include/graphene/peerplays_sidechain/bitcoin/bitcoin_script.hpp
index b550823e..bd85bf7b 100644
--- a/libraries/plugins/peerplays_sidechain/include/graphene/peerplays_sidechain/bitcoin/bitcoin_script.hpp
+++ b/libraries/plugins/peerplays_sidechain/include/graphene/peerplays_sidechain/bitcoin/bitcoin_script.hpp
@@ -25,14 +25,20 @@ enum class op {
    _16 = 0x60,
 
    // control
+   IF = 0x63,
+   ENDIF = 0x68,
    RETURN = 0x6a,
 
    // stack ops
    DUP = 0x76,
+   SWAP = 0x7c,
 
    // bit logic
    EQUAL = 0x87,
    EQUALVERIFY = 0x88,
+   ADD = 0x93,
+   GREATERTHAN = 0xa0,
+   GREATERTHANOREQUAL = 0xa2,
 
    // crypto
    HASH160 = 0xa9,
@@ -46,7 +52,7 @@ public:
 
    script_builder& operator<<( op opcode );
 
-   script_builder& operator<<( uint8_t number );
+   script_builder& operator<<( uint32_t number );
 
    script_builder& operator<<( size_t size );