Base plans 200ms block times with Denim mainnet upgrade

Coinbase's layer-2 network is targeting November 2026 to move from two-second blocks to five canonical blocks every second Base, the layer-2 network incubated by Coinbase , is getting ready to produce a new block every 200 milliseconds on mainnet. That works out to five blocks per second, on a chain that currently produces one every two seconds. The change arrives through an upgrade called Denim , which is targeted for mainnet activation in November 2026. Under Denim, that figure jumps to 432,000 blocks daily. It is a tenfold increase in block output, achieved without adding a single extra hour to the day. Denim has already gone live on Base Sepolia, the network’s testnet, where it was activated on October 21, 2026.

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