Ethereum Layer-2 Base Resumes After Three-Hour Block Production Outage

Ethereum News

Base, the Ethereum layer-2 network backed by Coinbase, resumed normal block production on Thursday after a multi-hour disruption halted the chain. The network’s public status page recorded a stoppage of roughly three hours and 35 minutes on mainnet, during which new blocks stopped advancing and deposits and withdrawals were impeded. The team’s own incident timeline framed the core halt as closer to two hours before sequencing recovered. Base is one of the largest AltVM-adjacent scaling networks settling to Ethereum, so any sustained pause carries weight for the broader rollup ecosystem and the assets bridged onto it.

According to the team’s public incident updates, the first sign of trouble appeared at 16:03 UTC, when Base flagged that mainnet block production had turned “unhealthy.” On-chain status data showed new blocks ceased advancing after block number 47806542, leaving the chain frozen at a single height while engineers triaged. By 16:27 UTC the project confirmed user assets remained safe, and by 16:52 UTC it said it had isolated the fault and was pursuing multiple remediation paths. The episode temporarily froze transaction processing across one of Ethereum’s busiest altcoin settlement layers, underscoring how concentrated rollup throughput has become.

The team attributed the disruption to an invalid block that stalled subsequent block generation, creating a consensus condition in which incorrectly ordered blocks blocked the chain from progressing. By 17:51 UTC a fresh sequence of blocks resumed and internal nodes were syncing correctly; by 17:58 UTC block production was described as proceeding normally with ecosystem infrastructure re-synchronizing. Base has not yet disclosed whether the invalid block stemmed from a software bug or a deeper consensus-related fault, and the team said a full post-incident report would follow. That a single malformed block could arrest an entire appchain-style network highlights the fragility risk in sequencer-dependent designs.

Node operators across the ecosystem were advised to restart their Base nodes to restore synchronization. The team noted that nodes stuck after the affected block height should return to normal operation once restarted and resynced, and confirmed that internal nodes had already realigned. As of the 19:22 UTC update, Base described its sequencer and supporting systems as stable, with block production running normally. The guidance is a reminder that, unlike Ethereum mainnet’s permissionless validator set, today’s leading rollups still lean heavily on centralized sequencing, where a single operator’s recovery actions are decisive for the whole network’s liveness.

Notably, the disruption did not derail Base’s scheduled protocol work. The team confirmed the Beryl hard fork proceeded on schedule at 18:00 UTC, even as recovery efforts were finalizing. Executing a planned upgrade in the same window as an active incident is unusual, and signals the team’s confidence that the consensus fault had been contained rather than left latent. For users and developers, the takeaway is that the roadmap held: the network restored liveness and shipped its planned fork in the same session, though the coincidence of the two events will likely feature prominently in the forthcoming root-cause analysis.

This was not Base’s first such event. The network previously suffered an outage in August 2025, and the recurrence will sharpen scrutiny of its reliability as it scales. The team said it will continue monitoring network stability, run additional validation to prevent a repeat, and publish a detailed incident report. On-chain status records also showed that the halt impeded deposit and withdrawal flows during the affected window, a tangible user impact beyond stalled transactions. The episode adds to an ongoing industry debate over sequencer decentralization and fault tolerance as more value migrates onto Ethereum’s layer-2 stack.

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