When solving cross-chain interoperability, the biggest challenge is treating the state of another chain as a trusted input. Lagrange's work in LSC (State Committees) acts as an intermediary layer of 'light consensus + provable state': each LSC consists of a group of client nodes that have staked an equivalent of 32 ETH on EigenLayer, with the task of witnessing and signing block finality and state after the DA confirmation of the corresponding optimistic rollup, subsequently providing usable state proof inputs for downstream provers. The underlying layer is the economic security model of AVS, while the upper layer is a verifiable state source aimed at developers.
In May 2024, the project team announced the integration of LSC with Arbitrum: this is equivalent to handing over a 'fast, trust-minimized' access interface to Arbitrum's state to developers. The state (account balances, Merkle branches, event sets, etc.) that was originally dependent on cross-chain oracles or trusted bridges can now be imported in a verifiable form through the path LSC → Prover → target chain contract. For applications requiring atomic settlement and cross-chain governance, this completes the shortcomings of 'slow synchronization, weak evidence.'
Why not just run 'light clients everywhere'? In reality, the complexity of implementing and maintaining cross VM and cross DA is extremely high, and there is a lot of repetitive work. The value of LSC lies in packaging AVS accountability and multi-client implementation together, exposing only the process of 'taking state—fetching proof—contract acceptance' to the application. Moreover, LSC can be chained with the aforementioned Prover Network: with LSC providing the witness and inputs, and Prover generating proofs in parallel, the end-to-end sunk time is shortened.
From an ecological perspective, this opens a secure path for cross Rollup atomic swaps, cross-chain reputation and points, and cross-chain governance. The integration case of Arbitrum is just the starting point; as more L2/L3 connections are established, 'multi-chain applications will experience state and proof like single-chain.' Public materials position the role of LSC very directly: 'providing verifiable state access after the batch processing of the target rollup is finalized,' which complements rather than replaces 'bridges' or 'message buses.'
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