The Base mainnet will undergo the Optimism Superchain U16A upgrade on October 8
Sep 30, 2025 11:37:53
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ChainCatcher message, Base Build on the X platform indicates that the Base mainnet will undergo the Optimism Superchain U16A upgrade from 1:00 to 3:00 Beijing time on October 8. This will temporarily invalidate pending withdrawals from the Base mainnet to Ethereum L1, while deposits and on-chain activities will continue as usual. Users should ensure that all pending withdrawal transactions are completed before 1:00 on October 8.
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