The mainnet disruptions lasted about 116 minutes and 20 minutes, with both incidents traced to a block-building flaw in the sequencer.
Base said the same sequencer (system that orders transactions) block-building bug was behind its mainnet outages on June 25 and June 26. The disruptions lasted about 116 minutes and 20 minutes, respectively. The issue allowed stale blocks to affect sequencing, pointing to a repeated fault in the network component responsible for assembling and ordering transactions before they are posted onchain.