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Interoperability & Bridges

Inter-Blockchain Communication Protocol (IBC)

Inter-Blockchain Communication Protocol (IBC) is an open-source protocol and implementation repository for communication between blockchains. It defines transport, authentication and ordering semantics, application packet encoding and processing, and software for deploying IBC on chains and relaying packets across them.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Inter-Blockchain Communication Protocol (IBC) — OpenViST project profile in Interoperability & Bridges.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use IBC when a project needs protocol specifications and software components for communication between blockchain networks, including chain integration, packet processing or relaying.

Who it is for

  • Blockchain developers building cross-chain messaging
  • Protocol engineers implementing chain-side interoperability
  • Application developers encoding and processing IBC packets
  • Operators developing relaying services

Documented uses

  • Specify interoperable communication between blockchain networks
  • Deploy IBC components onto a chain
  • Relay packets across connected chains
  • Encode and process application-layer packets
  • Implement transport, authentication and ordering semantics
Before you choose

Requirements & limits

The repository is public, active and open source under the Apache-2.0 license. The identified implementation language is Go, with Linux, server and self-hosted environments listed.

  • Choose the specifications when protocol semantics and ICS references are the main requirement.
  • Use the CLI materials when the work involves deploying IBC or operating relayer and attestor processes.
  • Review the v1 and v2 designs because they use different connection and packet-flow models.
  • Use the examples for local chain-oriented development study.
  • The repository contains both standards and implementation software, so users should identify whether they need protocol design material, chain integration or relay tooling.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Study the IBC repository structure

Locate the specifications, documentation, CLI, examples and schemas needed to plan an IBC integration.

Before you start

  • Access to the public IBC repository.
  • A Linux, server or self-hosted development environment may be used for the identified Go-based project.

Steps

  1. Review the spec directory for Interchain Standards and protocol definitions.

  2. Read the documentation covering what IBC is, how packets move between chains, and the IBC CLI.

  3. Inspect the cli directory for deployment, relayer and attestor processes.

  4. Use the examples directory to examine runnable local chain setups, and review proto for canonical protobuf sources.

Expected outcome

A repository-level map of the materials relevant to protocol study or integration planning.

Guide limitations

  • This guide covers repository orientation only; it does not document a completed deployment, relay operation or application execution.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
2 October 2026
Original website title
cosmos/ibc · Official homepage title · retained in its source language
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