The Base layer-2 network runs a single sequencer, which means one bug can stop everything. It is a centralized blockchain component that decides the order of transactions and has been responsible for outages on other layer-2 chains, including Arbitrum, OP Mainnet and zkSync Era.
On Thursday and Friday, Base mainnet experienced two block production outages, the first incident lasted 116 minutes and the second lasted 20 minutes.
There was a complete halt of new layer-2 blocks, and the sequencer and validator nodes could not progress past the invalid block until sequencing was restored.
The team fixed the outages by applying a patch to the sequencers to ensure the journal state was properly updated during execution.
However, mitigation took longer than expected “due to infrastructure conditions unrelated to the original bug,” they said.
There was also a “race condition” after the system reset, which prevented the sequencers from catching up, causing the second outage.
Related: Coinbase's Base resumes block production after 2-hour outage
Going forward, the Base engineering team plans to improve protocol “fuzz testing,” which involves bombarding the system with large volumes of random, malformed, or unexpected inputs to find bugs, and building “graceful recovery” so that validator nodes don’t need manual restarts during future incidents.
Not the first outage for Base
It is not the first sequencer-related outage for Base, which stopped producing blocks for 17 minutes in September 2024 and for around half an hour in August 2025.
Base is the second-largest layer-2 network by total value secured, which is just under $11 billion, according to L2beat.
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