Zero Knowledge
• Client-Side Hashing
Sign Document On-Chain
Cryptographically seal PDFs, contracts, and digital records into the XPR Network blockchain. Files never leave your browser—only their unique SHA-256 fingerprint is recorded forever.
Drop your document here, or click to browse
100% private. File is hashed locally in your browser and never uploaded to any
server.
SHA-256 Cryptographic Hash
Copy
Calculating SHA-256...
Fee of 1 XPR transfers to
xprotect with the
SHA-256 hash in transaction memo.
Document Signed Successfully!
Your document attestation is immutably confirmed on the XPR Network blockchain.
1
Local SHA-256 Hashing
Your document never leaves your machine. Your browser calculates the cryptographic digest directly using Web Crypto APIs.
2
WebAuth Attestation
Authorize the 1 XPR network fee via WebAuth biometric authentication (FaceID, TouchID, or Hardware Key).
3
Immutable Verification
The transaction and hash are permanently etched into block history. Anyone can verify document authenticity anytime.