Fraud Proof

Mechanism

A fraud proof is a cryptographic mechanism used in optimistic rollup systems to ensure the integrity of off-chain transaction processing. When a rollup operator proposes a new state root to the mainnet, there is a challenge period during which anyone can submit a fraud proof if they detect an invalid state transition. This proof cryptographically demonstrates the operator’s fraudulent behavior, leading to the invalidation of the erroneous state and potential penalties for the operator. It acts as a security check.