Flashblocks had operated on Base since July 2025 to stream partial transaction preconfirmations every 200 milliseconds between two-second blocks

From the articleBase's Denim Upgrade Brings 200ms Blocks to Mainnet on Nov. 5th on BanklessAlso in Base Now Makes a Block Every 0.2 Seconds After Its Denim Upgrade - Unchained, Base activates Denim upgrade, cutting block times tenfold to speed up trading and payments
Opening sign-in…