Support Segwit2X rollback protection

bitcoinclassic · Aug 14, 2017 · b6b2763 · b6b2763
1 parent c6051ce
commit b6b2763
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/main.cpp b/src/main.cpp
@@ -3113,6 +3113,12 @@ bool ContextualCheckBlock(const CBlock& block, CValidationState& state, CBlockIn
             }
         }
     }
+    else if (nHeight == 494784 && Params().NetworkIDString() == CBaseChainParams::MAIN) {
+        // if this is the SegWit2X initial block, it needs to be larger than 1MB
+        if (::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION) <= MAX_LEGACY_BLOCK_SIZE)
+            return state.DoS(100, false, REJECT_INVALID, "bad-blk-length-toosmall", false, "size limits failed");
+    }
+
     const std::uint32_t blockSizeAcceptLimit = Policy::blockSizeAcceptLimit();
     if (block.vtx.size() > blockSizeAcceptLimit || blockSize > blockSizeAcceptLimit) {
         const float punishment = (blockSize - blockSizeAcceptLimit) / (float) blockSizeAcceptLimit;