Optimism Nears Interoperability with Upgrade 20 Approval
Optimism has approved Upgrade 20, a crucial step towards achieving Superchain interoperability. The Ethereum layer-2 network's governance completed voting on September 16, paving the way for the targeted September 17 contract upgrade on OP Sepolia, Ink Sepolia, Soneium Minato, and Unichain Sepolia.
The upgrade moves fault proofs from Output Root Dispute Games to Super Root Dispute Games, a necessary change for future interoperability. This alteration will enable Super Roots to represent multiple chains at the same timestamp, a critical component of cross-chain interactions.
While interoperability remains a future step, Upgrade 20 aims to avoid modifying the security layer again when it's activated. The release also bundles changes to Optimism's contracts manager and SystemConfig, including safeguards around upgrade sequencing and cleanup of legacy configuration functions.
Chain operators must update their fault-proof infrastructure in preparation for the L1 contract cutover, while bridge and withdrawal developers face related changes due to the transition from Output Root games to Super Root games. However, ordinary users do not need to take action, as previously submitted withdrawal proofs remain valid.