Optimism to Enable Native Interoperability Between Unichain and OP Mainnet, Starting with ETH Transfers

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ETH news: Optimism and Unichain plan to enable native interoperability between Unichain and OP Mainnet, supporting direct ETH transfers at the protocol layer. The update will not use third-party bridges and requires governance approval. Upgrades 20 and 21 provide the underlying infrastructure but do not yet activate the feature. The first phase excludes ERC-20 tokens, unified balances, and cross-chain app execution.

ME News reports that on October 22 (UTC+8), the Optimism Foundation and the Unichain Foundation plan to launch native interoperability features on mainnet, with Unichain and OP Mainnet forming the first set of interoperable chains. This feature will verify cross-chain messages at the protocol level, eliminating reliance on independent third-party cross-chain bridge validators. The initial phase will focus on enabling native ETH transfers between the two chains, with future expansions planned to include token support, application integrations, and additional chains.
The plan still requires technical preparation and governance approval. Upgrades 20 and 21 will establish the infrastructure for interoperability but will not directly enable cross-chain interoperability; specific enabling arrangements will be submitted via a separate governance proposal. The initial phase does not include support for general ERC-20 transfers, unified balances across both chains, liquidity pools, or atomic execution of arbitrary cross-chain application workflows. (Source: Foresight News)

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