Optimism - All Sepolia OP-Stack chains: intermittent safe head stalls caused by L1 Sepolia Pectra deposit issue – Incident details

L1 Sepolia testnet has been updated and is stable again.

For any L1 execution-engine replicas, please update to the releases in the previous status-update, if not already updated.

Batch-submission and syncing of L2 testnets should be stable now that the L1 testnet is stable again.

L1 Sepolia Testnet is expected to update in 1 hour, at 2 PM UTC, to new L1 Execution-Layer Client releases.

It is strongly recommended to update to these releases on Sepolia testnet.

No action is needed on other L1 networks.

Geth: https://github.com/ethereum/go-ethereum/releases/tag/v1.15.5

Nethermind: https://github.com/NethermindEth/nethermind/releases/tag/1.31.4

Reth: https://github.com/paradigmxyz/reth/releases/tag/v1.2.2

Erigon: https://github.com/erigontech/erigon/releases/tag/v3.0.0-rc2

Sepolia L1 nodes that do not update are expected to fall out of sync, which may prevent batch-submission and stops L2 nodes from syncing.

The L1 Execution-layer clients are testing and soon publishing releases that fix the identified L1 issue. Official L1 client release communications will follow.

L1 Go-ethereum already has a ready release: https://github.com/ethereum/go-ethereum/releases/tag/v1.15.5

L1 testnet node operators are strongly recommended to upgrade to these releases.

The beacon-chain validators of the L1 Sepolia network are expected to deploy the fix in coordination around 2 PM UTC.

After L1 node upgrades and the 2PM UTC deployment the L2 batch-submission issue is expected to resolve.