How SHA-256 File Hashing Works
What SHA-256 file hashing is, why fingerprints matter for digital evidence, and how ProofIt uses them.
Published 2026-08-12 · ProofIt Editorial
Direct answer
SHA-256 turns file bytes into a 256-bit fingerprint. Change a single byte and the hash changes. Matching hashes strongly indicate identical content.
Definitions
A cryptographic hash function is one-way: you can verify content matches a hash, but you cannot reconstruct the file from the hash alone.
Where ProofIt fits
ProofIt uses SHA-256 content fingerprints for certification, optional trusted timestamping, and blockchain anchoring. Details: https://proofit.biz/technology.