Base mainnet stalls for nearly two hours after invalid block freezes sequencer

Coinbase’s Base mainnet stopped producing new blocks for nearly two hours on June 25, 2026 after an invalid block froze the network’s sequencer. Engineers first flagged unhealthy block production at 16:03 UTC and traced the issue to block #47,806,542 by 16:52 UTC. Sequencing resumed at 17:51 UTC and blockbuilding was confirmed healthy at 17:58 UTC, according to Base’s incident update.