Hi Product Hunt! I'm oleg_UYC, and I built Factflew because I refuse to accept that proving a file existed should cost you your identity. We live in an era where handing over your name, email, or phone number is treated as a trivial fee for the most basic digital services. A timestamp shouldn't require a dossier. Factflew is built around a strict UYC ("Unknow Your Customer") architecture: Zero data collection: No accounts, no tracking, no personal identity — not even an email address. Local processing: SHA-256 hashes are computed locally via the Web Crypto API; your files never leave your device. Immutable trust: Instant certificates anchored on Polygon, verifiable by anyone without an account. I'd love your thoughts on this privacy-first approach to data integrity. Try it out and tell me what you think! Cheers!

Factflew

Zero-data file certification via local Web Crypto & Polygon

Zero-data file certification via local Web Crypto & Polygon