The Optimism Foundation reverts to permissioned fraud proofs following security vulnerabilities

After community-driven audits uncovered security vulnerabilities involving two contracts, the Optimism Foundation reverted its network to its permissioned state. A representative of Optimism contributor OP Labs and protocol engineer Mofi Taiwo proposed a " Granite " hard fork for September 10th to fix the vulnerabilities. source: https://www.cryptopolitan.com/optimism-reverts-to-permissioned-fraud-proof/