OPTIMISM FOUNDATION DISABLES PERMISSIONLESS FRAUD PROOFS, PLANS HARD FORK FOLLOWING SECURITY AUDITS

Summary from the TLDR Crypto newsletter

Optimism rolled back its fraud proof system to a permissioned fallback mechanism after community-driven audits found multiple vulnerabilities. Two months ago, it reached Stage 1 rollup decentralization when anyone could contest L2 transactions on the mainnet. A proposed network upgrade, including a hard fork named "Granite," is set for September 10, aiming to enhance security without compromising user assets.