Optimism approved Upgrade 20 on September 16, moving four OP Stack testnets to Super Root dispute games in preparation for Superchain interoperability launch. This update transitions the fault-proof system from Output Root to Super Root, now using timestamps instead of block numbers to represent contested state. The testnets OP Sepolia, Ink Sepolia, Soneium Minato, and Unichain Sepolia are scheduled for a contract upgrade on September 17. Mainnet activation is targeted for September 24, contingent on a clean seven-day test period. This evolution represents a prerequisite for cross-chain interoperability, enabling Super Roots to represent multiple chains at the same timestamp.
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