Prove that's yours. Forever.

An irrefutable proof, recognized worldwide, impossible to falsify or delete.

$0.01 per certification - Unlimited

Certify a file

How it works - 3 simple steps

No technical knowledge required. If you can send an email, you can use xproof.

  1. Upload your file

    Drag any file: photo, document, music, code... Your file stays private, it is never uploaded.

  2. We compute the fingerprint

    A unique fingerprint (SHA-256 hash) is computed locally. It's like the DNA of your file.

  3. Engraved on the blockchain

    The fingerprint is permanently recorded on the blockchain. You receive a PDF certificate with a QR code.

Simple pricing - One price. No subscription.

$0.01 per certification. Pay only for what you use. No hidden fees, no commitment.

Frequently asked questions

Is my file uploaded to your servers?
No, never. Your file stays on your device. Only its fingerprint (a unique 64-character code) is computed locally and recorded on the blockchain.
What is the MultiversX blockchain?
MultiversX is a high-performance, eco-friendly European blockchain. Unlike Bitcoin, it consumes very little energy.
Does it have legal value?
Yes. Blockchain timestamping is recognized in many jurisdictions as proof of prior existence.

Protect your first creation

Join creators who secure their work. Only $0.01 per certification.