# Integrity hash

> Cryptographic fingerprint of the receipt proving no tampering occurred.

**URL:** https://quilometragem.com/glossary/integrity-hash

**Summary:** Cryptographic fingerprint of the receipt proving no tampering occurred.

- An integrity hash is the cryptographic fingerprint (SHA-256 or similar) computed over the receipt's content.
- Any later change — even a single character — produces a different hash, exposing tampering.
- Professional receipts print the hash on the PDF footer for independent auditor verification.
- Combined with a cryptographic timestamp, it carries legal weight equivalent to a signed physical document.

An integrity hash is the cryptographic fingerprint (SHA-256 or similar) computed over the receipt's content. Any later change — even a single character — produces a different hash, exposing tampering. Professional receipts print the hash on the PDF footer for independent auditor verification. Combined with a cryptographic timestamp, it carries legal weight equivalent to a signed physical document.