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alloy-chains

alloy-chains is a Rust library providing canonical type definitions for EIP-155 chains, alongside a manual registry and scripts that generate chain data and Rust source.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

alloy-chains — OpenViST project profile in Developer Tools.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use alloy-chains when a Rust project needs canonical EIP-155 chain types or when maintaining the repository's chain registry and generated source.

Who it is for

  • Rust developers building blockchain software that needs EIP-155 chain definitions.
  • Developers maintaining chain entries in the project's registry.
  • Developers building components intended for no_std environments with alloc.

Documented uses

  • Use canonical EIP-155 chain types in a Rust blockchain client.
  • Add or update a chain in the manual registry and regenerate the corresponding data and Rust source.
  • Use chain definitions in Rust workspace components intended to support no_std with alloc.
Before you choose

Requirements & limits

The repository is public and open source, and states that it is dual licensed under Apache-2.0 or MIT. The README lists Rust 1.85.0 as the current minimum supported Rust version.

  • The library is written in Rust and targets EIP-155 chain definitions.
  • Registry updates are made in registry/manual.json; the script generates assets/chains.json and src/generated/.
  • The README says workspace crates should support no_std with alloc.
  • The documented minimum supported Rust version is 1.85.0.

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

Update the chain registry

Regenerate chain data and Rust source after adding or updating a chain in the manual registry.

Before you start

  • Access to the alloy-chains repository
  • uv and Python to run the documented registry-update command

Steps

  1. Add or update the chain entry in registry/manual.json.

  2. Run the command below from the repository.

    Documented command
    uv run python scripts/update-registry.py

Expected outcome

The script updates assets/chains.json and regenerates the Rust source in src/generated/.

Guide limitations

  • The README says not to edit generated files directly.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
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Sources checked
12 October 2026
Original website title
alloy-rs/chains · Official homepage title · retained in its source language
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