Key Takeaways Dashjr said Aug. 18 that Bitcoin, which he calls “Spamcoin,” should handle replay protection. BIP-110 peaked at 2.53% miner support before its minority chain stalled Aug. 8. Bitcoin Knots plans a new sighash, but RDTS replay protection would remain opt-in. The issue matters because Luke Dashjr and other BIP-110 supporters are discussing a hard fork that would replace the minority chain’s SHA-256d mining algorithm with BLAKE2b. Such a move would permanently create a whole new design, but the two networks would still share their transaction history from before the split. What Exactly Is a Replay Attack? Imagine someone …