# hard fork

> English word · Noun

## Definitions
1. A rule change of a blockchain such that the software validating according to the old rules will see the blocks produced according to the new rules as invalid; the new blockchain resulting from such a split.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/hard-fork