ChainCatcher message, according to The Block report, OP Labs announced that the Fault Proof has been released on the OP Sepolia testnet. It stated: "Open-source, fully functional Fault Proof is now live on OP Sepolia. Through permissionless verification, anyone can participate in the system without an allowlist."
Fault Proofs serve as a security mechanism for Ethereum L2 networks, allowing users to challenge potentially fraudulent or incorrect transactions. They are crucial for ensuring that off-chain transaction processing remains tamper-proof.