Unichain plans to complete the mainnet migration on October 29, with Optimism fully responsible for the online production environment operation.

Written by: Liam Akiba Wright

Translated by: Chopper, Foresight News

Optimism is expanding its business, operating Ethereum-based Layer 2 networks for other brands. Uniswap Labs' Ethereum Layer 2 chain Unichain plans to delegate the operation of the production environment's sequencer, public node access, monitoring, and emergency response to Optimism, using the OP Enterprise solution.

The testnet migration for this plan is scheduled for October 13, and the mainnet migration is set for October 29. This operational strategy was first proposed by Jing Wang in an Ink announcement: the project team is responsible for building applications and ecosystems, while Optimism handles underlying infrastructure maintenance. Furthermore, the collaboration achieved by Soneium in September aligns with the division of responsibilities announced by Ink in June, with both chains built on OP Stack.

For users, the implications are not just about who handles failures. A unified service provider can deliver professional protocol capabilities and coordinated operations, but this also brings the risk of single point dependency. When the service provider experiences failures, whether users can submit transactions or retrieve funds depends on the contract design deployed by each chain.

Shifting from Technical Support to Full Operation

Unichain had previously established a partnership with OP Enterprise. An update on the Optimism website dated July 31 shows that Uniswap Labs was still operating Unichain independently at that time and was using the Mission Critical premium service package. In light of this October announcement, this change signifies that the collaboration is being upgraded from technical support to Optimism officially taking over Unichain's production environment operations.

Uniswap Labs has stated that after the migration, the chain ID, contracts, asset balances, applications, as well as Uniswap v2, v3, and v4 deployment content will remain unchanged. Unichain still belongs to Stage 1 scaling solution, retaining a permissionless fault-proof mechanism and original contract upgrade governance rights. Only the operator of the chain is changing, while the chain itself and upgrade rights remain unaffected.

Soneium announced on September 30 that support for deployment, sequencer operations, node infrastructure, upgrades, monitoring, and event response will be provided by Optimism Foundation and OP Labs. Soneium retains its development roadmap and engineering R&D work, including continual development of the chain itself and tokenized IP products, although the announcement did not specify the switch time.

An earlier implementation, Ink, adopted the same model. Jing Wang's announcement indicated that the Ink Foundation could focus on ecological construction, with Optimism responsible for network operation and optimization. The migration was originally planned to be completed in August, covering mainnet, testnet sequencers, RPC, block explorers, monitoring, and emergency response. Subsequent documentation explained that the Ink infrastructure is operated by the Optimism Foundation through OP Labs.

Behind Operational Custodianship, Reliability Commitments Come at a Cost

OP Enterprise is a blockchain infrastructure custodianship and technical service product launched by Optimism. The documentation outlines two modes: the self-hosted mode where clients manage the infrastructure themselves and control the sequencer and nodes, with Optimism providing only support and monitoring; and the fully managed mode where OP Labs operates the sequencer, batch transaction processor, state root proposal nodes, and chain infrastructure, responsible for security patch updates.

Each component has different responsibilities. The sequencer is responsible for transaction ordering, the batch transaction processor submits transaction data to Ethereum, and the proposal node submits chain state proofs. Project teams can outsource these routine tasks, which can reduce internal coordination costs. Ordering, data on-chain, and state submissions are entrusted to service providers, but Ethereum's settlement and proof verification contracts remain independent.

Soneium's protocol commits to a 99.9% uptime with 7×24-hour emergency response. The Mission Critical premium service package claims an availability of up to 99.95%, with an initial response to major incidents within 15 minutes and updates every 30 minutes. Unichain previously included this premium service package in its collaboration.

However, these are merely service commitments and do not guarantee that actual operational stability will necessarily improve. The 15 minutes is merely the initial response time; fixing faults could take longer.

The advantage of this model is that the chain's operator, protocol issue investigation, and patch deployment are streamlined through the same organization. However, the cost is that multiple independent Layer 2 chains become more reliant on the same institution for transaction ordering, operations, and fault resolution.

If the service provider's overall process encounters issues, multiple customer chains may be affected simultaneously. The announcement only states unified operations but does not disclose whether cloud server regions, signing keys, and other infrastructures are shared, thus there exists a potential risk for associated technical failures, which has not yet occurred.

Transactions Can Still be Force Submitted Even When Sequencer is Down

Under custodial services, Ethereum itself provides a fallback solution. Current L2BEAT assessments show that Unichain, Soneium, and Ink all support force submitting transactions through Ethereum, with a maximum delay of up to 12 hours.

The OP Stack documentation describes how this works: users submit deposit transactions to the portal contract of the chain on Ethereum. When the ordering window period ends, nodes can parse blocks and include these transactions without relying on the regular sequencer batch. Force submitted transactions can initiate withdrawals.

This preserves a pathway to bypass the sequencer; even if the sequencer goes offline or is subjected to scrutiny, transactions can still go on-chain. However, the final arrival of funds to Ethereum still needs to complete the withdrawal proposals and proof verifications, and this step may still have permission restrictions.

L2BEAT evaluates Unichain and Ink as Stage 1. As long as the submitter has sufficient funds, any third party can submit a state root. As long as a valid state root and proof are submitted and withdrawal conditions are met, users can bypass the original proposal node to complete withdrawals.

Soneium, however, has different permission dependencies. L2BEAT assessments show that its current scheme lacks available on-chain dispute mechanisms, and only whitelist proposal makers can post state roots. Once the whitelist proposal maker fails, user withdrawals will be frozen. The force on-chain transaction feature can only write transactions into the chain but cannot make up for the missing withdrawal proposal permissions.

L2BEAT retains a seven-day proof maturation period for the withdrawal evaluations of the three chains. Unichain and Ink also have additional settlement conditions: state root settlements require at least 3.5 days, followed by another 3.5 days after settlement completion. Proof submissions can occur earlier than settlements so the duration should not simply be added together to determine a fixed withdrawal cycle. Soneium, while lacking on-chain dispute processes, also faces withdrawal delays.

Optimism Taking Over Operations Does Not Mean Contract Upgrade Privileges Disappear

Production operation rights, contract upgrade rights, and asset custodianship are independent categories. Uniswap states that its governance structure remains unchanged. L2BEAT assessments indicate that contract upgrades for all three chains require approval from both the foundation and the security council; regular upgrades do not face delays, nor do they guarantee an exit window for users before emergency upgrades.

This means that even if Ethereum can serve as a fallback for transaction submissions when the sequencer fails, it does not assure users can complete withdrawals before malicious changes to the contracts occur. Stage 1 retains an exit path that does not depend on the operator, but the project team still has substantial contract upgrade privileges.

The native interoperability promised by Unichain remains a future function. Soneium's announcement clearly states that interoperability is not currently supported. Ink's announcement in June mentioned that one-day withdrawals could be achieved after the proof system goes live, but the current L2BEAT evaluation still retains a seven-day proof maturation period.

The next important milestones are the Unichain testnet migration (October 13) and mainnet migration (October 29). After the migrations are implemented, Optimism's strategy will shift from merely selling protocol support to operating a mature production-grade Layer 2 chain. Network reliability will be tested by actual service performance, while the safeguarding of user assets still depends on the underlying transaction access, state proposal, and contract upgrade rules of each chain.