protocol
Base's fourth mainnet hardfork moves the L2 to five canonical blocks per second and replaces the Flashblocks preconfirmation layer. Apps relying on block counts see timelocks shrink 10x.
protocol
Base's third mainnet upgrade lands validity transactions, composite allow/blocklist policies, ERC-8056 schedule multipliers, and a seizeWithMemo function for B20-standard tokens.
infrastructure
A consensus bug sequenced an invalid block, halting Base's single sequencer for ~2 hours. Sequencing restored by 17:51 UTC; Beryl mainnet upgrade still set for 18:00 UTC.