parameterize the mandatory coinbase

contrib/devtools/check-doc.py

@@ -23,7 +23,7 @@ REGEX_DOC = re.compile(r'HelpMessageOpt\(\"(\-[^\"=]+?)(?:=|\")')
 # list unsupported, deprecated and duplicate args as they need no documentation
 SET_DOC_OPTIONAL = set(['-rpcssl', '-benchmark', '-h', '-help', '-socks', '-tor', '-debugnet', '-whitelistalwaysrelay', '-prematurewitness', '-walletprematurewitness', '-promiscuousmempoolflags', '-blockminsize'])
 
-SET_DOC_OPTIONAL.update(['-con_fpowallowmindifficultyblocks', '-con_fpownoretargeting', '-con_nsubsidyhalvinginterval', '-con_bip34height', '-con_bip65height', '-con_bip66height', '-con_npowtargettimespan', '-con_npowtargetspacing', '-con_nrulechangeactivationthreshold', '-con_nminerconfirmationwindow', '-con_powlimit', '-con_parentpowlimit', '-con_bip34hash', '-con_nminimumchainwork', '-con_defaultassumevalid', '-parentgenesisblockhash', '-ndefaultport', '-npruneafterheight', '-fdefaultconsistencychecks', '-frequirestandard', '-fmineblocksondemand', '-mainchainrpccookiefile', '-testnet', '-ct_bits', '-ct_exponent', '-anyonecanspendaremine', '-fminingrequirespeers', '-fmineblocksondemand'])
+SET_DOC_OPTIONAL.update(['-con_fpowallowmindifficultyblocks', '-con_fpownoretargeting', '-con_nsubsidyhalvinginterval', '-con_bip34height', '-con_bip65height', '-con_bip66height', '-con_npowtargettimespan', '-con_npowtargetspacing', '-con_nrulechangeactivationthreshold', '-con_nminerconfirmationwindow', '-con_powlimit', '-con_parentpowlimit', '-con_bip34hash', '-con_nminimumchainwork', '-con_defaultassumevalid', '-parentgenesisblockhash', '-ndefaultport', '-npruneafterheight', '-fdefaultconsistencychecks', '-frequirestandard', '-fmineblocksondemand', '-mainchainrpccookiefile', '-testnet', '-ct_bits', '-ct_exponent', '-anyonecanspendaremine', '-fminingrequirespeers', '-fmineblocksondemand', '-con_mandatorycoinbase'])
 
 def main():
   used = check_output(CMD_GREP_ARGS, shell=True)

src/chainparams.cpp

@@ -130,6 +130,7 @@ protected:
         // By default assume that the signatures in ancestors of this block are valid.
         consensus.defaultAssumeValid = uint256S(GetArg("-con_defaultassumevalid", "0x00"));
         consensus.pegin_min_depth = GetArg("-peginconfirmationdepth", DEFAULT_PEGIN_CONFIRMATION_DEPTH);
+        consensus.mandatory_coinbase_destination = StrHexToScriptWithDefault(GetArg("-con_mandatorycoinbase", ""), CScript()); // Blank script allows any coinbase destination
         // bitcoin regtest is the parent chain by default
         parentGenesisBlockHash = uint256S(GetArg("-parentgenesisblockhash", "0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206"));
 
@@ -177,7 +178,6 @@ public:
         consensus.hashGenesisBlock = genesis.GetHash();
 
 
-        scriptCoinbaseDestination = CScript(); // Allow any coinbase destination
 
         vFixedSeeds.clear(); //!< Regtest mode doesn't have any fixed seeds.
         vSeeds.clear();      //!< Regtest mode doesn't have any DNS seeds.

src/chainparams.h

@@ -89,7 +89,6 @@ public:
     const ChainTxData& TxData() const { return chainTxData; }
     void UpdateBIP9Parameters(Consensus::DeploymentPos d, int64_t nStartTime, int64_t nTimeout);
     /** All coinbase outputs (after genesis) must be to this destination */
-    const CScript& CoinbaseDestination() const { return scriptCoinbaseDestination; }
     bool anyonecanspend_aremine;
 protected:
     CChainParams() = delete;
@@ -111,7 +110,6 @@ protected:
     bool fMineBlocksOnDemand;
     CCheckpointData checkpointData;
     ChainTxData chainTxData;
-    CScript scriptCoinbaseDestination;
 };
 
 /**

src/consensus/params.h

@@ -70,6 +70,7 @@ struct Params {
     CAsset pegged_asset;
     uint256 defaultAssumeValid;
     uint32_t pegin_min_depth;
+    CScript mandatory_coinbase_destination;
 };
 } // namespace Consensus
 

src/rpc/mining.cpp

@@ -120,7 +120,7 @@ UniValue generate(const JSONRPCRequest& request)
 
     LOCK(cs_main);
 
-    CScript coinbaseDest(Params().CoinbaseDestination());
+    CScript coinbaseDest(Params().GetConsensus().mandatory_coinbase_destination);
     if (coinbaseDest == CScript()) {
         coinbaseDest = CScript() << OP_TRUE;
 #ifdef ENABLE_WALLET
@@ -172,7 +172,7 @@ UniValue getnewblockhex(const JSONRPCRequest& request)
             + HelpExampleCli("getnewblockhex", "")
         );
 
-    CScript feeDestinationScript = Params().CoinbaseDestination();
+    CScript feeDestinationScript = Params().GetConsensus().mandatory_coinbase_destination;
     if (feeDestinationScript == CScript()) feeDestinationScript = CScript() << OP_TRUE;
     std::unique_ptr<CBlockTemplate> pblocktemplate(BlockAssembler(Params()).CreateNewBlock(feeDestinationScript));
     if (!pblocktemplate.get())

src/validation.cpp

@@ -2580,10 +2580,12 @@ bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pin
         return error("%s: Consensus::CheckBlock: %s", __func__, FormatStateMessage(state));
 
     // Check that all non-zero coinbase outputs pay to the required destination
-    BOOST_FOREACH(const CTxOut& txout, block.vtx[0]->vout) {
+    if (chainparams.GetConsensus().mandatory_coinbase_destination != CScript()) {
-        if (chainparams.CoinbaseDestination() != CScript() && txout.scriptPubKey != chainparams.CoinbaseDestination() && !(txout.nValue.IsExplicit() && txout.nValue.GetAmount() == 0))
+        BOOST_FOREACH(const CTxOut& txout, block.vtx[0]->vout) {
-            return state.DoS(100, error("ConnectBlock(): Coinbase outputs didnt match required scriptPubKey"),
+            if (txout.scriptPubKey != chainparams.GetConsensus().mandatory_coinbase_destination && !(txout.nValue.IsExplicit() && txout.nValue.GetAmount() == 0))
-                             REJECT_INVALID, "bad-coinbase-txos");
+                return state.DoS(100, error("ConnectBlock(): Coinbase outputs didnt match required scriptPubKey"),
+                                 REJECT_INVALID, "bad-coinbase-txos");
+        }
     }
 
     bool fScriptChecks = true;