Overview
- Base halted block production after an invalid block was sequenced on Thursday, June 25, causing roughly a two‑hour outage that stopped transactions, deposits, and withdrawals on the network.
- A second, similar sequencing halt occurred on Friday, June 26, which forced the team to postpone the B20 Activation Registry even though the broader Beryl upgrade was completed later that evening.
- Base engineers report they isolated and patched the root cause, told ecosystem node operators to restart nodes to resynchronize, and repeatedly said user funds were never at risk.
- Some ecosystem services reported continued deposit and withdrawal degradations for up to about 48 hours as operators restarted and resynced infrastructure after sequencing resumed.
- The incidents highlight a structural risk: Base uses a single Coinbase‑operated sequencer that can become a single point of failure, renewing calls for technical changes or greater sequencer decentralization as Base pursues tokenization and institutional use cases.