Fukuii

RecommendedScala 3

Ethereum execution layer client in Scala 3 — native Proof-of-Work consensus for Ethereum Classic and Mordor, plus Engine API V1–V4 for post-Merge Ethereum. Pairs with Lighthouse, Prysm, Teku, Lodestar, or Nimbus to run Sepolia and ETH mainnet. One binary, four networks. The primary ETC client for the Olympia era.

Documentation GitHub

Platform Support

WindowsmacOSLinuxDocker

Key Features

SNAP, fast, and regular sync for ETC and Mordor
Engine API V1–V4 — Sepolia validated, ETH mainnet ready
Compatible with all major consensus clients
Signed Docker images on GHCR
JSON-RPC, Engine API, and MCP support

Installation

Quick Install

docker pull ghcr.io/chippr-robotics/fukuii:latest

Docker

docker pull ghcr.io/chippr-robotics/fukuii:latest

Build from Source

# Requires JDK 25+ and sbtgit clone https://github.com/chippr-robotics/fukuii.gitcd fukuii && sbt assembly

Configuration

Note: Use network=etc for mainnet, network=mordor for testnet, network=sepolia for Engine API.

Mainnet (Chain ID 61)

fukuii --network=etc

Mordor Testnet (Chain ID 63)

fukuii --network=mordor

Actively Maintained

This client is actively developed and receives regular updates.

Need Help Getting Started?

Check out our network information page for RPC endpoints and testnet resources.

Network Info Testnet Faucets