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Clients for Olympia

No released client implements Olympia, which is a proposal, and each client's Olympia readiness is what its maintainers publish. Until a release implements it, run the latest release: Core-Geth's v1.13 line, the recommended client, or Fukuii, an alternative to try.

Compare and run the clients →

Olympia: Proposed · Draft ECIPs · Activation block TBDCountdown to , a placeholder target
Go

Core-Geth

RecommendedGo-Ethereum downstreamGo

An Ethereum Classic execution client and public-good Go reference client: a go-ethereum downstream released and maintained in the ethereumclassic GitHub organization, and the recommended client to run. Every v1.12 release ships known-vulnerable code, and one of those flaws was exploited against the Core-Geth v1.12 bootnodes in March 2026. The v1.12 line went 21 months without security maintenance; the v1.13 line closes every client CVE the audits found, bounds GraphQL queries, and is built with a supported Go toolchain.

Run: v1.13 lineOlympia readiness →
Sc

Fukuii

AlternativeAlphaScala

An EVM-compliant execution client in Scala 3 with pluggable consensus: native Proof-of-Work for Ethereum Classic and Mordor, and the Engine API for post-Merge Ethereum networks, paired with a consensus client. It continues IOHK's Mantis client and is maintained by Chippr Robotics LLC under Apache 2.0. Its maintainers mark it alpha, not yet recommended for production-critical workloads, so it is an alternative to try beside Core-Geth, the recommended client.

Run: Newest full releaseOlympia readiness →

A plugin is not a client implementation: the codebase it extends, and the decisions about it, stay with the project that maintains it. Plugins are therefore not part of a client's Olympia readiness. The plugin framework is described with the node clients.