Detect Edited Photos with a SHA-256 Fingerprint
SHA-256 in plain language: what a match proves, what a mismatch means, why photos sent via Zalo or Messenger never match, how to compare files.
Category
Verification & evidence
Trusted time, QR codes, SHA-256 and the evidential value of timestamped photos.
Trusted Time vs Phone Time: How Photo Timestamps Get Faked
How photo timestamps get faked (phone clock, EXIF edits, re-stamping) and how server-synced time plus a monotonic clock helps, with honest limits.
QR Photo Verification: How Recipients Check a Photo
How QR photo verification works for recipients: what the page shows, why the area is rounded, what integrity flags mean and how to compare files.
Are Timestamped Photos Valid Evidence in Vietnam?
Can timestamped photos be used as evidence in Vietnam? Electronic data under Vietnamese law, what boosts credibility, vi bang records, and app limits.