According to TechFlow, the Optimism Foundation announced the suspension of the permissionless fraud proof mechanism and restored the network to a permissioned state. This decision stems from the discovery of multiple security vulnerabilities by the community audit. Despite the discovery of high-severity issues, user assets were not affected.

To avoid potential instability, the permission fallback mechanism has been activated. Optimism plans to upgrade the network at 0:01 am Beijing time on September 11, codenamed "Granite", including multiple updates including L2 hard fork. OP Labs has conducted a security review of the changes and believes that the risk is low.