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Ethereum Classic Blog

ANNOUNCEMENT: Upgrade Your Nodes for the Ethereum Classic Spiral Hard Fork on Block 19,250,000

Donald McIntyre


The Ethereum Classic upgrade, code named SPIRAL, will occur on block 19,250,000. The estimated date for SPIRAL is January 31 2024.

spiral banner

Ethereum Classic core developers have posted ECIP-1109, which provides information for ETC’s SPIRAL hard fork.

This document proposes the following blocks at which to implement these changes in the Ethereum Classic networks:

9_957_000 on Mordor testnet (already upgraded in November of 2023)

19_250_000 on Ethereum Classic mainnet (estimated for January 31 2024)

For more information on the opcodes and their respective EIPs and implementations, please see the Specification section of this document.

Technical Details, Motivation, and Rationale

For technical details, motivation, and rationale for the hard fork, please visit ECIP-1109: http://ecips.ethereumclassic.org/ECIPs/ecip-1109

Node Explorer

Adoption across publicly visible ETC nodes can be tracked on this dashboard by looking at the percentage of nodes for which ForkId (Next) = Spiral:


Client supporting the SPIRAL hard-fork

The following client release contains SPIRAL support. All node operators are encouraged to upgrade as soon as possible.

– Core-geth v1.12.17 or later.


If you are using a managed API service or third-party service provider, then please ensure they are ready for SPIRAL.

The more people who ask, the more likely a provider is to make a public statement confirming their readiness.

If you are a miner, mining pool, node operator, wallet operator or other kind of ETC stakeholder, please upgrade your node/s to minimize the risk of network splits.

Thank you for reading this article!

To learn more about ETC please go to: https://ethereumclassic.org

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