THE BLOCK · 2026-11-05 19:00 UTC

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

Base deployed its Denim upgrade on mainnet, replacing Flashblocks with canonical blocks produced every 200 milliseconds (5 per second). The upgrade introduces millisecond-resolution timestamps for smart contracts via BaseTime and updates B20 token transfer and compliance controls. This is Base's fourth independent network upgrade this year, following Azul, Beryl, and Cobalt.

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