Replay Protection
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 side of a chain split is invalid or harmless on the other side. It can be built into consensus rules, transaction formats, signature hashing, address formats, or wallet coin-splitting workflows.
Good replay protection reduces accidental loss and makes exchanges, wallets, and merchants safer during forks. If protection is weak or absent, users may need to wait for wallet guidance before spending coins that exist on both chains.
Related terms
3 linkedExplore connected entries beyond the alphabetical index.
Replay Attack
→When a valid transaction from one chain is maliciously or accidentally broadcast and accepted on another chain after a fork.
Chain Split
→A permanent divergence into two or more incompatible blockchain histories.
Fork
→A fork is a blockchain divergence caused by competing blocks, software changes, or incompatible consensus rules.
All terms and definitions may update as the Cryptionary improves.
