This upgrade, proposed by OP Labs, introduces a new L1 contract, the SuperchainConfig, along with improvements to the existing pause mechanism.The proposed upgrade takes the current incident response mechanism a step further, introducing a Superchain-wide pause mechanism that can enhance protection across multiple fronts, including the L1CrossDomainMessenger and withdrawals for ERC-20 and ERC-721 tokens, which are additional security critical code paths that protect user assets.

If this vote passes, the L1 contracts which support the OP Mainnet network will be upgraded to the versions of those contracts in the optimism repo at commit 856c08b (tagged as release candidate op-contracts/v1.2.0-rc.1).

This proposal is eligible for Voting Cycle #18: https://gov.optimism.io/t/upgrade-Request-4/7534