Add HAC option -ac_minopreturnfee to change OP_RETURN fee per tx, regardless of tx size, default is 1 coin

src/miner.cpp

@@ -118,6 +118,7 @@ public:
 
 extern int8_t ASSETCHAINS_ADAPTIVEPOW;
 extern uint32_t ASSETCHAINS_RANDOMX;
+extern uint32_t ASSETCHAINS_MINOPRETURNFEE;
 extern bool fRandomXDebug;
 extern std::string devtax_scriptpub_for_height(uint32_t nHeight);
 
@@ -521,6 +522,11 @@ CBlockTemplate* CreateNewBlock(CPubKey _pk,const CScript& _scriptPubKeyIn, int32
             // Opret spam limits
             CAmount opretMinFee = 1 * COIN;
 
+            // Set with -ac_minopreturnfee
+            if (ASSETCHAINS_MINOPRETURNFEE > 0) {
+               opretMinFee = ASSETCHAINS_MINOPRETURNFEE;
+            }
+
             {
                 bool fSpamTx = false;
                 unsigned int nTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);