---
title: "execution/hardforks"
description: "Defines Optimism hardforks and activation rules used throughout op-reth."
source: https://basehub.org/crates/execution/hardforks/
---
import { LinkCard } from '@astrojs/starlight/components';

## Overview

The `execution/hardforks` sub-crate (`reth-optimism-forks`) is part of the [execution crate group](/crates/execution/overview/).

It enumerates Optimism hardforks and their activation rules, supplying the fork schedule consumed across op-reth.

## Source

<LinkCard title="View source on GitHub" href="https://github.com/base/base/tree/main/crates/execution/hardforks" />