# Base recovers from a 33-minute mainnet block-production halt

> The incident established a realized sequencer failover and provisioning failure capable of interrupting Base mainnet block production, deposits, and withdrawals. Base said it would change cluster admission behavior and testing.

- URL: https://riadefi.com/on-chain/2025-08-05-coinbase-bridge-base-mainnet-block-production-halt/
- Type: Market stress
- Stage: Postmortem
- Evidence: confirmed
- Materiality: material
- Event date: 2025-08-05
- Version: 1, published 2026-08-22 (first published 2026-08-22)
- Advisor-relevant: yes
- Affects: Base canonical bridge (protocol)

## What happened

Base's active sequencer fell behind, and an automated Conductor handoff selected a sequencer that was still being provisioned and could not produce blocks. Mainnet block production stopped for 33 minutes.

## What changed

The incident established a realized sequencer failover and provisioning failure capable of interrupting Base mainnet block production, deposits, and withdrawals. Base said it would change cluster admission behavior and testing.

## What did not change

Base reported full network recovery by 06:40 UTC. The postmortem did not report a bridge-contract exploit, asset loss, or chain reorganization.

## Confirmed

- Base mainnet block production stopped at approximately 06:07 UTC on August 5, 2025.
- The status incident identified deposits, withdrawals, block production, and Flashblocks as affected components.
- The team manually paused Conductor and transferred leadership to a healthy sequencer.
- Base reported full recovery after 33 minutes.

## Still open

- The status postmortem states planned infrastructure and testing improvements but does not prove when each corrective action was deployed.
- The receipt does not quantify transaction-level deposit or withdrawal delays after block production resumed.

## What it means for an advisor

- Review the coinbase-bridge memo's availability and withdrawal assumptions against a realized sequencer failover outage.
- Record that canonical bridge access can become temporarily unavailable during a Base sequencing halt even without a bridge-contract exploit.
- Verify whether current operational controls now prevent an unready sequencer from becoming leader.

## Sources

1. [Base Mainnet | Unsafe head delay](https://status.base.org/incidents/kdq3t8s13gfs) · Base · 2025-08-05


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Published by Ketju Research on RIADeFi (https://riadefi.com). Educational research for financial professionals; not investment, legal, tax, or compliance advice.