Optimism reversed back
2 months ago, Optimism transitioned from Permissioned Fraud Proof to Permissionless Fraud Proof.
Permissioned Fraud Proof is a trusted proposer from the Optimism network which handles as the only one able to contest transactions. Meanwhile, Permissionless Fraud Proofs is an open Fault Proof mechanism that allows all users in Optimism to contest potentially fraudulent or incorrect transactions on this layer-2 network. However, after community-driven audits identified some bugs at varying levels of severity in the Permissionless Fraud system, this month (August) the Optimism Foundation reverted the Permissionless Fraud Proof to Permissioned Fraud Proof.
This will bring a hard fork to Optimism as they change the contract and bring a new homework to bring the Permissionless Fraud Proof back soon to enhance decentralization network.
