- Starknet suffered a temporary mainnet outage tied to a state mismatch between its execution and proving layers.
- The bug involved the blockifier remembering a reverted state write, producing an incorrect execution that the proving layer detected.
- The proving layer prevented the faulty transactions from reaching L1 finality, triggering a block reorganization that rolled back 18 minutes of activity.
- The team pledged increased testing and code audits after the incident.
- This was the second major 2025 disruption; a September upgrade caused a multi-hour outage and about one hour of rolled-back activity.
The team behind Starknet, an Ethereum layer‑2 scaling network, reported a temporary mainnet downtime on Monday, January 5, 2026, caused by a state discrepancy between the execution layer and the proving layer, according to the report. The mismatch occurred during a specific combination of cross-function calls and reverts that led the execution layer to record an incorrect state write.
The post-mortem explains that the execution tool known as the blockifier “remembered a state-writing that happened within a function that was reverted, causing an incorrect transaction execution,” the report said. The network’s proving layer correctly flagged the inconsistency and stopped the faulty transactions from reaching L1 finality, preventing the error from being committed to the ledger.
Operators executed a block reorganization to resolve the discrepancy, reverting about 18 minutes of network activity. The team reported that mainnet functionality has returned to normal and said it will strengthen testing and perform code audits to reduce the risk of similar errors.
This incident follows an earlier disruption in 2025 after a major protocol upgrade called Grinta. A post-mortem for the September outage found a sequencer bug stopped block production for over five hours and required two chain reorganizations, forcing roughly one hour of activity to be rolled back, as detailed in the September report and illustrated in the network uptime data on Starknet’s status page.
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