This upgrade is proposed in response to security vulnerabilities identified during a series of third-party security audits by Spearbit, Cantina, and Code4rena. None of the vulnerabilities have been exploited, and user assets are not and were never at risk. The upgrade includes both a set of smart contract upgrades to fix the vulnerabilities identified in the audit as well as an L2 hardfork to improve the stability and performance of the fault proof system. In addition, we propose extending the capabilities of the Guardian and DeputyGuardian to set the anchor state for the fault proof system in order to prevent referencing invalid anchor states. Aside from implementing these fixes, the primary impact of this upgrade would be to reset user withdrawals at the planned time, similar to the initial Fault Proof upgrade.

Granite is code complete in the optimism monorepo at commit a81de910dc2fd9b2f67ee946466f2de70d62611a and op-geth at commit 0f5b9dcfd2ac66f6fd8faae526b1549721f5f392.

This proposal is eligible for Voting Cycle #26: https://gov.optimism.io/t/upgrade-proposal-10-granite-network-upgrade/8733

If passed in the Token House, it will proceed to a veto period in the Citizens’ House.