Base sets Nov 5 mainnet date for Denim 200ms blocks
Base's Denim upgrade activates on mainnet Thursday, November 5 at 18:00 UTC, cutting block times from 2 seconds to 200 milliseconds — a 10x speedup to five canonical blocks per second. The hard fork, already live on Sepolia, requires teams using Flashblocks to migrate to the new native block cadence ahead of activation.
In the run-up to the upgrade, Alchemy teased the activation on X — "Are you ready for @base Denim on Thursday?" — after previously amplifying the announcement and retweeting Silvia Vlachou's post detailing the rollout.
Sources
Alchemy
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