# L2 Interop Working Group - Call #12
**Aug 6, 2025**
- [Recording](https://youtu.be/sqYmCPwvaKE)
- [Calendar invite for future calls](https://docs.google.com/forms/d/e/1FAIpQLSfMFEJmyVgjLuiipgxprEkiQXwwK3F_PfGbWvU8ZmV6e_ka0A/viewform)
### [Agenda](https://github.com/ethereum/pm/issues/1608)
1. [The Signal: Ethereum](https://x.com/0xEverly/status/1945842494429700388) + Boundless + Interop [Jacob]
1. [OIF](https://www.openintents.xyz/) updates & getQuote API [Pepe, OpenZeppelin & Jim, LIFI]
1. [t1](https://x.com/t1protocol) - native interop & permissionless asynchronous composability [Orest]
1. [Routescan](https://x.com/routescan_io/status/1951280859698364563) + Interoperable addresses aka chain-specific addresses [Jaack]
1. 7828 resolver - [Unruggable](https://github.com/unruggable-labs/ens-7828-resolver) and Wonderland [Ndeto & Titi]
1. [Axal Yield ](https://x.com/getaxal/status/1952716186061283615)[Ash]
## Call Notes
*condensed notes below – watch the recording (above) for full discussion*
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## AI summary
## 1. The Signal: Ethereum + Boundless (Jacob)
**Main Topic:** Trustless cross-chain access to Ethereum state using ZK proofs
**Key Takeaways:**
- Boundless is building a ZK-powered light client called *The Signal: Ethereum* to enable *verifiable access to finalized Ethereum state* from any chain.
- Uses a full validity proof of finalized epochs via Casper finality gadget in RISC Zero zkVM.
- Drastically reduced proving costs via:
- Faster zkVM versions (R0 v2 → v3),
- Transition from AWS to subsidized on-prem compute (via Boundless Market),
- Use of EIP-7549 to reduce required attestations (100x cost drop).
- Enables chains and apps to verify finalized Ethereum state (and historic ranges) with no trust assumptions beyond Ethereum’s validator set.
- Tooling available via the `steel` library and EVM compatibility layer.
- Commitment to operate as a public good; already raised $900K+ in proving subsidy funding.
- Working toward multi-chain support and eventual “proof singularity”: one proof representing multiple chain states.
- Latency today ~12–15 mins, mostly due to finality wait time, but improvements (e.g. 3SF, faster execution) are on the way.
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## 2. Open Intents Framework (Pepe - OpenZeppelin, Jim - LIFI)
**Main Topic:** Cross-chain intents standardization and ecosystem tooling
**Key Takeaways:**
- **Standardization:** Improving ERC-7683 to make it more practical and complete for real-world wallets and solvers.
- **Contracts:** Modular Solidity contracts for intents are ready and being adopted by early partners.
- **Tooling:**
- Reference solver implementation to bootstrap new ecosystems.
- API standard for off-chain quoting to unify integrations across solvers.
- SDKs to simplify developer integration.
- **Aggregator:** Optional off-chain aggregator is being built to reduce UX friction — not a central dependency.
- **LIFI Updates (Jim):**
- Finalizing ERC-7683-compliant OAU protocol.
- Working on multi-chain input intents with Wonderland team to solve fragmented balances across chains.
- **Non-EVM Support:** Conceptually prepared, but not in first milestone. Ready to adapt if ecosystem partners like Coinbase push for it.
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## 3. t1 Protocol – Native, Fast, Permissionless Interop (Orest)
**Main Topic:** Asynchronous, fast, crypto-economically secure interop layer
**Key Takeaways:**
- **Philosophy:** Fill the gap between ZK-native trustless interop and “trust me bro” solutions. Prioritize *speed* while maintaining meaningful security.
- **Mechanism:**
- Permissionless composability between L2s by attesting to events/state on other chains via TEE + AVS stack.
- zk proofs only used *on-demand* when value-at-risk exceeds crypto-economic budget — a novel cost-saving design.
- **Security Architecture:**
- Separate sequencing + execution roles.
- TEE outputs are made reproducible to enable fraud detection and slashing.
- Deterministic outputs → crypto-economic accountability.
- **Next Milestones:**
- Deploy ERC-7683-based testnet demo with ~second-level latency (vs 1h+ today).
- Add support for asynchronous writes and composability use cases.
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## 4. Routescan – Interoperable Addresses / Chain Metadata (Jaack)
**Main Topic:** Championing ERC-7785 as a canonical registry for chain identity
**Key Takeaways:**
- **Problem:** Cross-chain naming (e.g. `vitalik.eth@arbitrum`) lacks a decentralized, structured backing for defining and verifying what "arbitrum" is.
- **Solution:** ERC-7785 as a dictionary of chains — includes name, chain ID, RPCs, explorers, metadata.
- **Goal:** Merge this with existing interop address standards (ERC-7828/7930) and ENS-powered formats.
- **Importance:** Helps explorers, wallets, infra tools coordinate on consistent metadata and avoids relying on unmaintained GitHub chainlists.
- **Call to action:** Encouraging ecosystem to adopt and contribute to ERC-7785 as the backend for 7828/7930-style addresses.
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## 5. ERC-7828 Resolver – ENS-based Chain-Specific Addressing (Ndeto & Titi – Unruggable & Wonderland)
**Main Topic:** Human-readable, chain-specific addresses via ENS
**Key Takeaways:**
- **Standard:** ERC-7828 = `name.eth@chainname` format using ENS + coin type records.
- **Current Implementation:** Resolver contract + library that allows apps to resolve 7828-formatted addresses to chain-specific addresses.
- **Data Source:** Currently powered by a centralized chain list; long-term goal is a decentralized registry (potentially 7785-powered).
- **Demo:** Live, working resolver repo available.
- **Ask:** Collaborators wanted to help evolve this toward a decentralized registry (in line with Routescan's 7785 work).
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## 6. Axal Yield – Fast Stablecoin Savings UX (Ash & Dev)
**Main Topic:** UX demo of savings account leveraging latest standards
**Key Takeaways:**
- **Architecture:**
- 7702-style wallets.
- Fast TX batching with Alchemy.
- Full EOA exportability for users.
- **Performance:**
- End-to-end TX processing in 300ms (!)
- 100K USDC deposits for ~$0.01 gas cost.
- Monitoring of ERC20 and ERC-4626 logs to track user balances on/off platform.
- **Vision:** UX-forward, self-custodial product leveraging modern interop and wallet standards.
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