Base deploys Denim upgrade on mainnet, replacing Flashblocks with 200ms block times

Base's fourth independent mainnet upgrade, Denim, is now live, producing a full canonical block every 200 milliseconds, or five per second, the Coinbase-incubated Layer 2 said. The upgrade retires Flashblocks and changes the pending block tag, with the protocol enforcing the 200ms interval rather than relying on the sequencer's clock; apps using Flashblocks must migrate to canonical block subscriptions. Denim introduces BaseTime, giving smart contracts millisecond-resolution Unix timestamps, plus new B20 token protections and compliance controls. It follows Azul, Beryl, and Cobalt, Base's earlier 2026 upgrades.

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