Protocol or wallet techniques that prevent transactions from one chain being valid on another after a split.
Replay protection ensures that a transaction valid on one chain cannot be accepted on another. This can be implemented at the protocol level (e.g., different sighash rules or opcodes) or handled by wallets via coin-splitting and chain-specific metadata.
"Following a hard fork, the chain may adopt unique signature hashing rules so signatures from one chain are invalid on the other, preventing replays."
All terms and definitions may update as the Cryptionary improves.