Golden Finance reports that the Layer 2 blockchain Optimism aims to help Ethereum users trade quickly and with low fees. Its technology is the basis for some of the biggest names in blockchain, but for years, Optimism has had a problem. Until now, a core feature has been missing from Optimism's security design: "fault proofs." On Monday, this long-promised technology finally landed on Optimism's mainnet. Fault proofs are designed to ensure the honesty of Layer-2 chains based on Optimism. They help prevent Layer-2 chain operators from passing inaccurate transaction data to Ethereum's Layer-1 transaction ledger and provide support for the "decentralized" withdrawal mechanism of Layer-2 chains.