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Interchain Standards (ICS) for the Cosmos network & interchain ecosystem.

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IBC

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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.

See ROADMAP.md for a public up-to-date version of our roadmap.

What is IBC?

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
1 ICS Specification Standard N/A

Core

Interchain Standard Number Standard Title Stage Implementations
2 Client Semantics Candidate ibc-go
3 Connection Semantics Candidate ibc-go
4 Channel & Packet Semantics Candidate ibc-go
5 Port Allocation Candidate ibc-go
23 Vector Commitments Candidate ibc-go
24 Host Requirements Candidate ibc-go
25 Handler Interface Candidate ibc-go
26 Routing Module Candidate ibc-go

Client

Interchain Standard Number Standard Title Stage Implementations
6 Solo Machine Client Candidate ibc-go
7 Tendermint Client Candidate ibc-go
8 Wasm Client Draft
9 Loopback Client Draft
10 GRANDPA Client Draft

Relayer

Interchain Standard Number Standard Title Stage Implementations
18 Relayer Algorithms Finalised go-relayer, rust-relayer, ts-relayer

App

Interchain Standard Number Standard Title Stage Implementations
20 Fungible Token Transfer Candidate ibc-go
27 Interchain Accounts Candidate ibc-go
28 Cross-Chain Validation Draft
29 General Relayer Incentivisation Mechanism Candidate ibc-go
30 IBC Application Middleware N/A N/A
31 Cross-Chain Queries Draft N/A
721 Non-Fungible Token Transfer Candidate bianjieai

Translations

The Interchain Standards are also translated into the following languages:

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