# L2 Interop Working Group - Call #5 **March 19, 2025** - [Recording](https://youtu.be/QoT_yyuKXBg) - [Calendar invite for future calls](https://docs.google.com/forms/d/e/1FAIpQLSfMFEJmyVgjLuiipgxprEkiQXwwK3F_PfGbWvU8ZmV6e_ka0A/viewform) ### [Agenda](https://github.com/ethereum/pm/issues/1367) 1. [Interopolis](https://x.com/Interopolis/status/1902038440876642510) [Sprinter] 1. Interoperable addresses [skele] 1. Open Intents Framework updates [Josh] 1. Interop roadmap discussion [Josh] 1. OIF x Espresso Hackathon [Jill] 1. [7755 updates](https://github.com/ethereum/RIPs/pull/43) [Jack] 1. 7683 Demo from Omni [Zodomo] ## Call Notes *condensed notes below – recommend watching the recording (above) for full discussion* ### TL;DR - Reminder: "solving interop" = there is no meaningful difference to users between using a single chain and using many chains - near-term goal: fast, easy, trust-minimized movement of assets across any chain - Interopolis: - new interop event in Greece at the end of May. Focused on moving forward the most important components of L2 interop. No panels, no noise :) - ERC-7828 - "interoperable addresses" (formerly chain-specific addresses) - 7828 going through a revamp, but same goal – let users input something like [email protected] into the "send" field and have the wallet handle the rest - resolution-agnostic approach (specific address format TBD), but we need a deterministic link between what the user sees and the actual chain that it links to - next steps: consolidate feedback, finalize the spec, and start working on a wallet prototype that incorporates this work - Open Intents Framework: - starting design for OIF v2.0 - new partners helping to drive the effort include LIFI, OpenZeppelin, along with Hyperlane, Across, Uniswap, Bootnode, Arbitrum, Wonderland, OP and others. - same goal: easy, modular deployment of "fast bridging" infra (eg intents, solvers, resource locks) to all Ethereum chains - will move quickly and continue to iterate as we ship improvements - Interop roadmap discussion: - shared v1 version of the "12-month interop roadmap" – feedback welcome! - Espresso hackathon with Open Intents Framework: - growing the pie of developers who can be building crosschain and with intents, improving education and onboarding - Current participation metrics: - 250+ developers signed up / 4,000 viewers / 20 devs @ office hours - 7755: crosschain calls - standard for crosschain calls across all Ethereum chains - 3 main components: contracts for message passing, offchain fulfillers for relaying messages, settlement layer - contracts deployed to test networks for Base, Arbitrum, and Optimism. And added ERC 4337 smart account support. Audits underway. - 7683 demo from Omni team - Zodomo joined to share quick demo on Omni's 7683-compliant generalized intent system. Will support any crosschain call, not just swaps/transfers. SDK to build crosschain dapps. Working with Symbiotic for crosschain support. --- *--- AI Summary (may contain inaccuracies) ---* ### 1. Interopolis event - L2 interop event happening in Athens, Greece: May 22nd-23rd - Apply here: https://chainsafe.notion.site/interopolis-brief ### 2. Interoperable Addresses Update (ERC-7828) - Rebranded from “chain specific addresses” to “interoperable addresses” - Key goals: - Create deterministic link between names and chain ID/address pairs - Maintain flexibility in chain/address definitions and resolution - Ensure resolution agnostic approach - Build future-proof versioning while maintaining machine readability - Technical implementation: - Four key fields: target chain ID, target address, resolver chain ID, resolver address - Version system (0.0.0.0) allows different message digestion methods - Supports both compressed and uncompressed formats - Next steps: - Revamp ERC-7828 - Gathering additional community feedback - Developing full technical specification - Creating wallet prototype for testing  ### 3. Open Intents Framework (OIF) Updates - Moving toward “OIF 2.0” with expanded collaboration - New partners joining effort: - OpenZeppelin - Wonderland team - Leafi - Original partners: Hyperlane, Across, BootNode - Core goal remains unchanged: modular deployment of fast bridging infrastructure to all chains - Focus on improving initial foundation before scaling development - Open call for additional participants in OIF 2.0 development ### 4. Interop roadmap discussion - discussion on WIP roadmap + open request for comments/feedback -  ### 5. Espresso Systems Hackathon Progress - Current participation metrics: - 266 developers signed up globally - 4,000 viewers for collaborative workshop - 20 developers attending office hours - Key challenges identified: - Limited pool of developers with blockchain architecture expertise - Gap between smart contract developers (600,000,000 contracts deployed) and chain deployment expertise - Partners include: - Hyperlane - Across - BootNode - OpenZeppelin - Running through end of March ### 6. Cross-Chain Standards Development (7755) - Now categorized as Roll-up Request for Comment (RRC) 7755 - Successfully tested between Base Sepolia, Optimism Sepolia, and Arbitrum Sepolia - Key features: - Storage proof verification mechanisms for OP stack and Arbitrum chains - Smart account support (ERC 4337) added - Hashi prover integration for non-EVM chain support - Properties: - Permissionless system - Supports arbitrary call execution - 1-3 second latency for call fulfillment - No contract owners required -  ### 7. Omni Protocol Demo - Demonstrated ERC 7683 compliant generalized intent system - Key features: - Cross-chain deposit capabilities - SDK for easy integration - Gas-optimized on-chain intents - 8-second cross-chain call completion (Base Sepolia to Ethereum Holsky) - Technical implementation: - Order data packing optimization - Separated selectors for space utilization - Status filtering capability - Public testnet launch upcoming with partners including Symbiotic