Fukuii

About Fukuii

Fukuii is Ethereum Classic's first native client, built ground-up for ETC rather than derived from an Ethereum client. It is an EVM execution client in Scala 3 LTS on Pekko Typed Actors, running on the JVM. One binary runs several networks at once in one JVM process, each isolated with its own state, its own metrics registry, and its own configuration — a further network is configuration, not a new client. Consensus is selected per deployment behind one interface: native Proof-of-Work for ETC mainnet and Mordor, or Proof-of-Stake with a built-in consensus layer, so one process is a complete Proof-of-Stake node; an external consensus client over the Engine API V1–V4 is the alternative. Fukuii ships an MCP server exposing node state to AI agents. It is enterprise-grade by way of the JVM rather than by a separate edition: JVM-native infrastructure end to end for institutions already running on the JVM, with no foreign-language bridge, so JFR, async-profiler, JMX and heap dumps work exactly as they do on any other JVM process. Prometheus metrics, Grafana dashboards, and liveness and readiness endpoints ship in the binary, alongside concurrent multi-instance execution and external-signer/HSM custody integration. Apache 2.0, with Cosign-signed build provenance and a CycloneDX SBOM on release artifacts. Maintained by The Fukuii Authors (Chippr Robotics LLC and White B0x Inc.).