IBC

Synopsis

This repository is the canonical location for development and documentation of the inter-blockchain communication protocol (IBC).

It shall be used to consolidate design rationale, protocol semantics, and encoding descriptions for IBC, including both the core transport, authentication, & ordering layer (IBC/TAO) and the application layers describing packet encoding & processing semantics (IBC/APP).

Contributions are welcome. See CONTRIBUTING.md for contribution guidelines.

What is IBC?

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For a high-level explanation of what IBC is and how it works, please read this blog post.

Interchain Standards

All standards at or past the "Draft" stage are listed here in order of their ICS numbers, sorted by category.

Meta

| Interchain Standard Number | Standard Title | Stage | Maintainer | | ---------------------------------------- | -------------------------- | ----- | ------------- | | 1 | ICS Specification Standard | N/A | Protocol team |

Core Transport

| Interchain Standard Number | Standard Title | Stage | Implementations | Maintainer | | ------------------------------------------------------------- | -------------------------- | --------- | --------------- | ------------- | | 2 | Client Semantics | Candidate | ibc-go, ibc-rs | Protocol team | | 3 | Connection Semantics | Candidate | ibc-go, ibc-rs | Protocol team | | 4 | Channel & Packet Semantics | Candidate | ibc-go, ibc-rs | Protocol team | | 5 | Port Allocation | Candidate | ibc-go | Protocol team | | 23 | Vector Commitments | Candidate | ibc-go, ibc-rs | Protocol team | | 24 | Host Requirements | Candidate | ibc-go, ibc-rs | Protocol team | | 25 | Handler Interface | Candidate | ibc-go, ibc-rs | Protocol team | | 26 | Routing Module | Candidate | ibc-go, ibc-rs | Protocol team | | 33 | Multi-hop Messaging | Candidate | ibc-go | Protocol team |

Light Clients

| Interchain Standard Number | Standard Title | Stage | Implementations | Maintainer | | --------------------------------------------------------------- | -------------------------- | ----- | --------------- | ------------- | | 6 | Solo Machine Client | Candidate | ibc-go | Protocol team | | 7 | Tendermint Client | Candidate | ibc-go, ibc-rs | Protocol team | | 8 | Wasm Client | Candidate | ibc-go, ibc-rs | Protocol team / Composable Finance | | 9 | Loopback Client | Draft | ibc-go | Protocol team | | 10 | GRANDPA Client | Draft | | Octopus Network |

Relayer

| Interchain Standard Number | Standard Title | Stage | Implementations | Maintainer | | ---------------------------------------------------------------- | -------------------------- | ----- | --------------- | ------------- | | 18 | Relayer Algorithms | Finalized | go-relayer, rust-relayer, ts-relayer | Protocol team |

App

| Interchain Standard Number | Version | Standard Title | Stage | Implementations | Maintainer | | -------------------------------------------------------- | ------- | ----------------------- | --------- | ------------------------------------------------------------------------------------------------------------------------- | ------------------ | | 20 | v1 | Fungible Token Transfer | Candidate | ibc-go, ibc-rs | Protocol team | | 20 | v2 | Fungible Token Transfer | DEPRECATED | | Protocol team | | 27 | v1 | Interchain Accounts | Candidate | ibc-go | Protocol team | | 28 | v1 | Cross-Chain Validation | Candidate | interchain-security | Cosmos Hub team | | 29 | v1 | General Relayer Incentivization Mechanism | DEPRECATED | | Protocol team | | 30 | v1 | IBC Application Middleware | N/A | N/A | Protocol team | | 31 | v1 | Cross-Chain Queries | Draft | N/A | Protocol team | | 32 | v1 | Interchain Queries | Candidate | async-icq | Strangelove Ventures | | 100 | v1 | Interchain Atomic Swap | Candidate | ibcswap | Side Labs | | 721 | v1 | Non-Fungible Token Transfer | Candidate | nft-transfer | IRIS Network |

Translations

The Interchain Standards are also translated into the following languages:

• Chinese