EEA Working Group
Crosschain Interoperability
Standardising one of the most important areas in blockchain and distributed ledger technologies: interoperability — transferring assets, sending and receiving messages, and initiating actions across DLT networks.
Our focus
Standardising DLT interoperability
The EEA Crosschain Interoperability Working Group is dedicated to standardising interoperability across blockchain and distributed ledger technologies. Our specifications support the public Ethereum Mainnet and EVM-compatible networks — including consortium blockchains, optimistic rollups and zk rollups — as well as non-EVM blockchain networks. We define DLT interoperability as three capabilities:
Transfer assets
The ability to transfer assets from one DLT network to another DLT network.
Send & receive messages
The ability to send and receive messages across DLT networks.
Initiate actions
The ability to initiate actions across DLT networks.
Contributors
The companies behind the specification
The DLT Interoperability Specification was edited and contributed to by people from the organisations below, as credited in the specification itself — together with EEA staff and independent experts.
Resources
Specifications & publications
EEA DLT Interoperability Specification
Edited by Weijia Zhang, Anaïs Ofranc and Marelize Kriel. The Working Group's core specification for interoperable DLT networks.
Published EEA documents
- EEA DLT Interoperability Working Group — Presentation
- Case Study — Crosschain intraday repo settlement
- Case Study — Expanding liquidity and interoperability of digital assets
- Crosschain Decentralization Guidelines v1.0
- Crosschain Security Guidelines v1.0
- Crosschain Interoperability Use Case v1.0
Documents in development
- Crosschain Identification SpecificationWork in progress
- EIP-3220 — Crosschain Identifier SpecificationWork in progress
- Crosschain Messaging & Function Call InterfacesMerged into the technical specification draft
Videos & blog
Educational videos
- Enabling Real-Time Corporate Treasury for Banks with Blockchain
- Token Economics & Blockchain Security
- Crosschain Asset Transfer for Non-Fungible Tokens
- Crosschain Applications using the Crosschain Protocol Stack & GPACT
- Transferring Value to and from the Ethereum Mainnet
- Blockchain / Crosschain / DeFi Bridge Design
- General Purpose Atomic Crosschain Transactions (GPACT)
From the blog
Chairs
Working Group leadership
Dr. Weijia Zhang
WanchainMarelize Kriel
AdharaHow to contribute
Two ways to get involved
Specifications & guidelines development
The working group collaborates on specifications and guidelines defining requirements for DLT interoperability implementations. Contribute by joining the bi-weekly calls and by writing, reviewing and providing feedback on draft specifications.
Code and test suite
If you are a developer, contribute to the interfaces of the Crosschain Protocol Stack — a way for enterprises to create interoperable components for crosschain communications.
Contact
Non-EEA members: interested in the group's work?
Contact eea-wg@entethalliance.org.
EEA members: contact the EEA Secretariat or your
member council representative.