ZeFirst: Proof of Existence

An idea, a design, a manuscript, code, an invention… The day you have to prove you were first, what do you do? With ZeFirst, in about thirty seconds you get a proof timestamped to the second that nobody can alter, erase or backdate – not even us. READY FOR IPHONE DUO Open it and ZeFirst switches to two columns: your file on one side, your proof on the other. Drag a photo from Photos or Files and it is timestamped as is. Closed, everything fits on the outer display. Also on iPad. HOW IT WORKS • Pick a file: document, image, code, audio, any format. • Your device computes its digital fingerprint (SHA-256): 64 unique characters that can't be reversed. • Your file never leaves your device. Only the fingerprint is sent. • ZeFirst records it on a public blockchain, with the exact date and time. • You get a PDF certificate with a QR code and a verification link to share. VERIFIABLE WITHOUT US Every proof carries its references: network, contract, transaction and a link to the public explorer. Anyone can re-verify it from your file, even if ZeFirst disappeared one day. WHO IS IT FOR? Writers, creators, designers, developers, inventors, photographers, musicians, students, founders: anyone who shares files and wants to be able to say "this was mine, first". EVERYTHING YOU CAN DO • Create a proof of prior existence in a few taps • Verify a file or a fingerprint, even without an account • Find all your proofs in "My proofs" • Download your PDF certificate, with QR code • Share a verification link • Co-ownership: record a proof together, with each person's share • Back up access to your account so you never lose it • 5 languages, light or dark theme SIMPLE, NO CRYPTO Sign in with your e-mail (a one-time code), with Apple or with Google. No password, no cryptocurrency to buy: blockchain fees are on us. Your first 2 proofs are free. After that, refer a friend or buy credits in the app (1 credit = 1 proof). Your account also works on the web, at zefirst.app. Good to know: ZeFirst proves that a file existed, exactly as it is, on a given date. It is not a patent or trademark filing. Tip: record your file before sharing it, and keep the original untouched.