Unichain - Unichain Mainnet: Post-Fusaka Safe Head Stall – Incident details

Unichain Mainnet erroneously posted the same batch transaction at two different nonces. This triggered a corner case in the consensus layer client that made it impossible for the L2 Safe Head to progress. OP Labs has a fix available: us-docker.pkg.dev/oplabs-tools-artifacts/images/op-node:v1.16.3. Please upgrade your consensus layer clients on Unichain to use this image until OP Labs provides a newer release.

We have identified that the root cause of the safe head stall on Unichain Mainnet is due to a bug in how op-node handles fetching blobs. All nodes operators will need to update their op-node tous-docker.pkg.dev/oplabs-tools-artifacts/images/op-node:e1db990da90a845e1943b1dc20f59e18099db538

After working with OP Labs, we have identified both an issue in our batch submission and in the consensus client handling of such a case. We are trying to roll out a new version of the consensus client that fixes this issue.