Sign a document. Anyone can verify it.
Fast Signer signs a PDF with your Fast address and records that signature on-chain (fast:mainnet). Anyone can later confirm who signed it, when, and that not a byte has changed — and your document never leaves this page. Only its fingerprint is published.
Sign a PDF
Choose a PDF, sign it in your Fast Wallet, and download a signed copy — stamped with a QR that links to its on-chain record.
Sign a documentVerify a PDF
Drop a signed PDF to see who signed it and when, and confirm each signature against the on-chain record. Works offline. Tamper-evident.
Verify a document