# L2 Interop Working Group - Call #6 **April 2nd, 2025** - [Recording](https://youtu.be/FFdTIfLu4YI) - [Calendar invite for future calls](https://docs.google.com/forms/d/e/1FAIpQLSfMFEJmyVgjLuiipgxprEkiQXwwK3F_PfGbWvU8ZmV6e_ka0A/viewform) ### [Agenda](https://github.com/ethereum/pm/issues/1404) 1. 7811 walkthrough from Reown [Luka] 1. ZuBerlin Interop event [Chris] 1. Resource Locks [OneBalance] 1. Message Passing [Espresso] 1. Open Intents Framework [OpenZeppelin] 1. Interoperable addresses + interoperable wallet [Wonderland] 1. Interop Marketplace [Georgios, Hashi] ## Call Notes *condensed notes below – watch the recording (above) for full discussion* ### TL;DR - ERC-7811 walkthrough and demo [Luka, Reown] - Today, when dapps interact with wallets they have to get assets on their own - 7811 introduces a new RPC call, wallet_getAssets, for wallets to declare to the dapp what assets are owned by the user across all chains - Why useful: allows wallets to aggregate balances across chains (e.g. if I have some USDC on Arbitrum and some USDC on Optimism), and wallet can automatically handle bridge/swaps to provide a more seamless UX - Read more about 7811 in the [whitepaper here](https://github.com/reown-com/whitepaper-walletkit-erc7811/blob/main/Whitepaper-Reown-WalletKit-ERC-7811-Towards-a-United-Onchain-UX.pdf) - ZuBerlin Interop Event [Chris] - ZuBerlin.city: interop track June 15-16 in Berlin - DM @chrishg on TG for more info - Resource Locks [Stephane, OneBalance] - Overview of resource locks, and how they fit into ongoing intents work - With intent-based bridge: solver take on source chain finality risk - With resource locks: the lock provider removes double spend and finality risk - Account based locks vs escrow-based locks - Doesn't play nice with 7702, but 7701 can solve the problem by adding native AA - Message Passing Updates [Ellie, Espresso] - After considering a few different options, the group is moving forward with using ERC-7786. Will see what changes need to be made to meet the desired properties defined by the group. Currently working on user-friendly gas abstraction protocol. - Open Intents Framework (OIF) [Pedro, OpenZeppelin] - OpenZeppelin is in the process of finalizing a roadmap for the OIF 2.0, in collaboration with Hyperlane, Bootnode, Across, LIFI, and others. - Similar to what ERC20 unlocked for DeFi, we believe the OIF can do similar for interop and intents (rebalancing, settlement, and many other things). - Interoperable addresses + interoperable wallet [Titi, Wonderland] - Working with EF and others on "interoperable wallet" proof-of-concept (testnet only) - Integrating chain-specific addresses aka interoperable addresses - Milestone 1: trust-minimized crosschain txs. Milestone 2: private txs. - Interop Marketplace [Georgios, Hashi] - Comprehensive resource for all new chains to get seamlessly onboarded onto relevant interop providers. Helps with matchmaking for chains, interop providers, bridges, and solvers. Still early, but reach out to Georgios for more info.