Starknet outage incident report: State conflict between execution layer and proof layer caused approximately 18 minutes of on-chain activity rollback

The Ethereum L2 network Starknet released an analysis report on the short-term mainnet outage that occurred this Monday, stating that the cause of the incident was the inconsistency between the execution layer (blockifier) and the proof layer: under specific cross-function calls and rollback combinations, the execution layer incorrectly recorded a state write that had been rolled back, leading to abnormal transaction execution. The related transactions did not receive L1 finality confirmation. This incident triggered a block reorganization, with approximately 18 minutes of on-chain activity being rolled back.

This is the second major interruption since 2025, following a September incident where a sequencer vulnerability caused an outage of over 5 hours and rolled back about 1 hour of on-chain activity.