New: Ethereum & Polygon Support
Prove ownership
forever on blockchain
Upload a file, sign it with your crypto wallet, and get an immutable certificate of ownership.
Drag & drop file here or click
Supports any file type
🎨
For Designers
Protect your work before publishing in a portfolio. Prove you created the logo or illustration first.
⚖️
For Business
Freeze the state of a contract or NDA at the moment of signing. Guarantee of document immutability forever.
🎵
For Creators
Beatmakers, writers, and researchers can secure the priority of an idea before the official release.
How it works
1
1. Select File
SHA-256 algorithm creates a unique fingerprint. The file is never uploaded and stays on your device.
2
2. Sign It
Use your crypto wallet to place a mathematically irrefutable signature on this fingerprint.
3
3. Get Certificate
Download the PDF proof. You now have eternal confirmation of ownership.