# Content hash

> A content hash is a SHA-256 digest of a document’s normalised parsed text; Arieta Data records a new version whenever the hash changes.

URL: https://data.arietalabs.com/glossary/content-hash/

Hashing the parsed text, not the upstream HTML, means page-chrome changes (menus, banners) never create versions, while every real text change does.

A hash change can also come from a parser upgrade of the current version. The history SKU says so in diffSummary when that is the cause.

Sources:
- [LexAPI docs: point-in-time versions](https://lex-api.com/docs)