Base's Denim Upgrade Brings 200ms Blocks to Mainnet on Nov. 5th
BanklessWilliam M. Peaster
Base's fourth solo upgrade retires Flashblocks and moves to five blocks a second, with a catch for any app that counts blocks as time. Base’s blocks are about to get 10x shorter. Per its latest node release, the Coinbase-incubated L2 will activate its Denim hard fork on Thursday, Nov. 5th at 18:00 UTC, trading its 2-second block time for five full blocks each second. Real blocks, not previews: Each 200ms slot will be a full block, with a block number, hash, and receipts of its own. That makes Flashblocks, the 200ms preconfirmation layer Base has layered over its 2-second blocks since July 2025, obsolete, so Denim switches it off. Apps still reading Flashblocks streams or the “pending” tag need to move to standard block feeds first.
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