Soft fork logic for BIP113

src/main.cpp

@@ -3276,12 +3276,18 @@ bool ContextualCheckBlock(const CBlock& block, CValidationState& state, CBlockIn
     const int nHeight = pindexPrev == NULL ? 0 : pindexPrev->nHeight + 1;
     const Consensus::Params& consensusParams = Params().GetConsensus();
 
-    // Check that all transactions are finalized
+    // Start enforcing BIP113 (Median Time Past) using versionbits logic.
-    BOOST_FOREACH(const CTransaction& tx, block.vtx) {
     int nLockTimeFlags = 0;
+    if (VersionBitsState(pindexPrev, consensusParams, Consensus::DEPLOYMENT_CSV, versionbitscache) == THRESHOLD_ACTIVE) {
+        nLockTimeFlags |= LOCKTIME_MEDIAN_TIME_PAST;
+    }
+
     int64_t nLockTimeCutoff = (nLockTimeFlags & LOCKTIME_MEDIAN_TIME_PAST)
                               ? pindexPrev->GetMedianTimePast()
                               : block.GetBlockTime();
+
+    // Check that all transactions are finalized
+    BOOST_FOREACH(const CTransaction& tx, block.vtx) {
         if (!IsFinalTx(tx, nHeight, nLockTimeCutoff)) {
             return state.DoS(10, false, REJECT_INVALID, "bad-txns-nonfinal", false, "non-final transaction");
         }