[Base Network Outage Review: Two Consecutive Downtimes Caused by Sequencer Bug] BlockBeats News, June 28: According to official reports, the root cause of two consecutive outages on Coinbase's Layer 2 network, Base, last week has been identified as a software bug in the block construction logic of the Sequencer. The Base engineering team stated that after an invalid transaction failed to execute, the associated temporary state (Journal State) should have been cleared. However, due to a program defect, the old state was mistakenly retained, ultimately causing the Sequencer and validation nodes to fail in generating new blocks. On June 26, the Base mainnet experienced two block production interruptions as a result, with the first lasting 116 minutes and the second lasting 20 minutes. The team noted that although a patch was implemented to fix the Sequencer state update issue, a "race condition" occurred after the system reboot, preventing the Sequencer from resynchronizing in time and triggering the second outage. Additionally, certain infrastructure issues prolonged the overall recovery time. Base stated that it will strengthen protocol fuzz testing to improve its ability to detect vulnerabilities under abnormal input scenarios and optimize network recovery mechanisms to avoid future incidents requiring manual restarts of validation nodes. It is worth noting that this is not the first time Base has experienced failures due to Sequencer-related issues. Similar incidents occurred in September 2024 and August 2025, resulting in approximately 17 minutes and 30 minutes of network downtime, respectively. Currently, Base remains the second-largest Ethereum Layer 2 network by total value secured (TVS). [Original Link]