Client Implementations

Fukuii is the primary client for the Olympia era. Core-Geth is actively maintained and carried through the upgrade for network continuity, then scheduled to phase out as Fukuii assumes the primary role. ETC compatibility plugins for major upstream clients are planned for future release.

Olympia UpgradeBlock number to be announced on the Olympia Community Developer Calls

Fukuii

RecommendedScala

Next-generation ETC client purpose-built for Ethereum Classic. The recommended client for node operators upgrading to Olympia.

Current: v0.1.240View upgrade guide →

Core-Geth

MaintainedGo

The legacy ETC client, actively maintained and carried forward through the Olympia upgrade for network continuity. Scheduled to phase out as Fukuii assumes the primary client role. The upstream go-ethereum plugin architecture is the long-term path.

Current: v1.13.0View upgrade guide →

ETC Compatibility Plugins

Planned for release after Olympia activation — compatibility layers that bring Ethereum Classic support to major upstream EVM clients without maintaining full forks. Enables enterprise deployments, archive nodes, and cross-chain infrastructure on any preferred execution environment.

Hyperledger Besu

JavaFuture

Enterprise-grade EVM client from the Hyperledger Foundation. Apache 2.0 licensed. Planned ETC compatibility plugin for enterprise deployments and institutional infrastructure.

GitHub →Docs →

Erigon

GoFuture

Archive-optimized EVM client designed for minimal disk usage and fast historical queries. Preferred for analytics infrastructure and full-history nodes.

GitHub →

Go Ethereum

GoFuture

The upstream geth client. ETC compatibility layer maintains parity with the canonical Go Ethereum codebase for maximum tooling compatibility.

GitHub →Docs →

Nethermind

C#Future

High-performance .NET EVM client. Enables ETC integration for the Microsoft and enterprise .NET ecosystem, with native Windows deployment support.

GitHub →Docs →