Replay Attack
Security● Common
An attack where a valid transaction on one blockchain is rebroadcast on another chain sharing the same transaction format. Occurs after contentious hard forks if replay protection isn't implemented. Victim accidentally sends on both chains.
Technical Notes
Example: BCH fork from BTC initially lacked replay protection. Defense: chain-specific transaction formats, SIGHASH flags, different address formats. Not applicable within Bitcoin (single chain). Relevant when interacting with forked chains.
Metadata
Visibility: Public
Created:1/3/2026by System