What Is a Cryptographic Timestamp?
A plain-English explanation of cryptographic timestamps, file fingerprints, and how they differ from ordinary date stamps.
Published 2026-08-12 · ProofIt Editorial
Direct answer
A cryptographic timestamp is evidence that a specific digital fingerprint (usually a hash) existed at a particular time, backed by cryptography rather than an editable file date. It supports claims about existence and time—not automatic legal ownership.
Definitions
A hash is a fixed-length fingerprint of file bytes. A trusted timestamp (for example RFC 3161) is a signed assertion from a Time Stamping Authority that it observed that hash at a given UTC time. A blockchain record can also anchor a hash in a public ledger.
Where ProofIt fits
ProofIt generates SHA-256 fingerprints, can request RFC 3161 timestamps (for example via Sectigo), and can register hashes on Ethereum. Original files are not published on-chain or sent to the TSA.
Where it does not fit
A timestamp does not by itself create copyright, prove you are the only author, or guarantee court acceptance. Those questions depend on law, facts, and jurisdiction.