Summary
TLDR: OP Stack’s latest fault-proof system is being tested on OP Sepolia before mainnet launch. Fault proofs are used to verify transaction legitimacy on optimistic rollups. Optimistic rollups assume transactions are valid unless proven otherwise. Optimism currently relies on a seven-day challenge window for fraud detection. The fault-proof system includes a fault-proof program, virtual machine, and dispute game protocol. The system focuses on accurate bond incentives for honest challengers. The latest testnet launch introduces permissionless validation for withdrawals without involving trusted third parties.
Key Points
1. OP Stack’s latest fault-proof system has landed on OP Sepolia, the final testing sphere before mainnet.
2. Fault proofs, otherwise known as fraud proofs, are used to determine the legitimacy of a transaction on an optimistic rollup before it is recorded in the state of the base blockchain layer.
3. Unlike zero-knowledge rollups, where a transaction is instantly proven to be accurate or inaccurate, optimistic rollups are optimistic by nature, and they assume all transactions are valid unless proven otherwise.