Written by: Liam Akiba Wright
Compiled by Chopper, Foresight News
Optimism is expanding its operations to run Ethereum-based Layer 2 networks for other brands. Unichain, Ethereum’s Layer 2 chain under Uniswap Labs, plans to entrust Optimism with production-grade sequencer operations, public node access, monitoring, and incident response using the OP Enterprise solution.
The testnet migration is scheduled for October 13, and the mainnet migration is set for October 29. This operational strategy was first proposed by Jing Wang in the Ink announcement: the project team is responsible for building applications and the ecosystem, while Optimism handles the underlying infrastructure operations. Additionally, Soneium’s collaboration in September aligns with the division of responsibilities outlined in Ink’s announcement in June, as both chains are built on the OP Stack.
For users, the impact extends beyond who handles failures. A unified service provider can offer professional protocol capabilities and coordinated operations, but it also introduces single-point dependency risks. When the service provider experiences an outage, users’ ability to submit transactions or withdraw funds depends on the contract design deployed on each chain.
Transition from technical support to full operational management
Unichain had previously established a partnership with OP Enterprise. According to an update on Optimism’s official website on July 31, Uniswap Labs was still independently operating Unichain, alongside the Mission Critical premium service package. In light of this October announcement, the change signifies an escalation of the partnership, with Optimism officially assuming operational responsibility for Unichain’s production environment.
Uniswap Labs stated that after the migration, the chain ID, contracts, asset balances, applications, and deployments of Uniswap v2, v3, and v4 remain unchanged. Unichain continues to be a Stage 1 scaling solution, retaining its permissionless fraud proof mechanism and original contract upgrade governance rights. Only the chain’s operator has changed; the chain itself and its upgrade rights remain the same.
On September 30, Soneium announced that it will receive support from the Optimism Foundation and OP Labs for deployment, sequencer operations, node infrastructure, upgrades, monitoring, and incident response. Soneium retains full control over its own development roadmap and engineering efforts, including ongoing development of the chain and tokenized IP products; the announcement did not specify a transition timeline.
Earlier, Ink adopted the same model. In the announcement, Jing Wang explained that the Ink Foundation could focus on ecosystem development, while Optimism would handle network operations and optimization. The original plan was to complete the migration by August, covering the mainnet, testnet sequencer, RPC, block explorer, monitoring, and incident response. Subsequent documentation clarified that Ink’s infrastructure is operated by the Optimism Foundation through OP Labs.
Behind managed operations lies a cost for reliability commitments.
OP Enterprise is a blockchain infrastructure hosting and technical services offering from Optimism. The documentation outlines two modes: In the self-hosted mode, customers operate their own infrastructure, managing sequencers and nodes, while Optimism provides only support and monitoring. In the fully managed mode, OP Labs operates the sequencer, batch transaction processor, state root proposal node, and chain infrastructure, and is responsible for security patch updates.
Each component has a distinct role: the sequencer handles transaction ordering, the batch processor submits transaction data to Ethereum, and the proposer node submits chain state proofs. By outsourcing these routine tasks, project teams can reduce internal coordination costs. While sequencing, data onboarding, and state submission are delegated to service providers, Ethereum settlement and proof verification contracts remain independent.
Soneium’s protocol guarantees a monthly 99.9% uptime with 24/7 emergency response. The Mission Critical Advanced Service Package claims up to 99.95% availability, with initial response within 15 minutes for major incidents and progress updates provided every 30 minutes. Unichain’s previous collaboration included this Advanced Service Package.
However, these are merely service commitments and do not guarantee an actual improvement in operational stability. The 15-minute timeframe applies only to initial response; fault resolution may take longer.
The advantage of this model is that the chain operator, protocol troubleshooting, and patch deployment are handled by the same organization. However, the cost is that multiple independent brand layer-2 chains are becoming increasingly reliant on a single entity for transaction ordering, operations, and issue resolution.
If the service provider’s overall process encounters an issue, multiple customer chains could be affected simultaneously. The announcement only mentions unified operations but does not disclose whether infrastructure such as cloud server regions or signing keys are shared, thus posing a potential risk of correlated technical failures—though no such incidents have occurred yet.
Transactions can still be forcibly submitted even if the sequencer goes down.
Under the custodial service, Ethereum itself provides a fallback solution. Current evaluations from L2BEAT show that Unichain, Soneium, and Ink all support forced transaction submission via Ethereum, with a maximum delay of up to 12 hours.
The OP Stack documentation describes how it works: users submit a deposit transaction to the portal contract on Ethereum. When the sequencing window ends, nodes can parse the block and include this transaction without relying on regular sequencer batches. A forced transaction can initiate a withdrawal.
This maintains a path to bypass the sequencer, allowing transactions to be included on-chain even if the sequencer goes offline or implements censorship. However, for funds to ultimately be credited to Ethereum, the withdrawal proposal and proof verification steps must still be completed, and these steps may still involve access restrictions.
L2BEAT rates Unichain and Ink as Stage 1. Any third party can submit a state root as long as they have sufficient funds. Users can bypass the original proposer node to withdraw funds by submitting a valid state root, proof, and meeting the withdrawal conditions.
Soneium has different permission dependencies. According to the L2BEAT assessment, its current design lacks an available on-chain dispute mechanism, and only whitelisted proposers can publish state roots. If all whitelisted proposers become inactive, user withdrawals will be frozen. The forced transaction inclusion feature can only write transactions to the chain but cannot compensate for the missing withdrawal proposal permissions.
L2BEAT maintains a seven-day proof maturity period for withdrawal assessments on all three chains. Unichain and Ink have additional settlement conditions: state root settlement requires at least 3.5 days, followed by another 3.5 days after settlement is complete. Proof submissions can occur before settlement, so the durations cannot be simply added together to determine a fixed withdrawal period. Although Soneium lacks an on-chain dispute process, it still experiences withdrawal delays.
Optimism taking over operations does not mean the contract upgrade permissions are gone.
Operational rights, contract upgrade rights, and asset custody belong to distinct and independent domains. Uniswap states that its governance structure remains unchanged. L2BEAT’s assessment shows that contract upgrades on all three chains require joint approval from the Foundation and the Security Council; routine upgrades proceed without delay, and no exit window is guaranteed for users prior to emergency upgrades.
In other words, even though Ethereum can act as a fallback to submit transactions when the sequencer fails, it does not guarantee that users can withdraw before malicious changes to the contract occur. Although Stage 1 retains an exit path independent of the operator, the project team still holds significant authority to upgrade the contract.
Unichain's promised native interoperability remains a future feature. The Soneium announcement explicitly states that interoperability is not currently supported. Ink announced in June that withdrawals could be completed in one day after the proof system launches, but L2BEAT's current assessment still retains a 7-day proof maturity period.
The next key milestones are the Unichain testnet migration (October 13) and the mainnet migration (October 29). After the migrations are completed, Optimism’s strategy will evolve from merely selling protocol support to operating a mature, production-grade Layer 2 chain. Network reliability will be validated by actual service performance, while user asset security continues to depend on the underlying transaction admission, state proposal, and contract upgrade rules of each chain.