Private by design · independently verifiable

Give any file a permanent moment in time.

Create a private digital fingerprint in seconds, then make it permanent when you're ready. Your original file never leaves your device.

Create Free ProofSee How It Works
  • Your file stays private
  • Free preview, no account
  • No technical setup

Free private preview

See your file's proof in seconds

Choose any file. ChainProof creates its digital fingerprint automatically—privately in your browser, with no account needed.

Choose a file to begin

Images include a preview. Other files receive a clear, recognizable file card.

Your free proof appears automatically after you choose a file.

Your finished record

Evidence designed to be shared.

Every permanent timestamp includes a polished certificate with the file details, public record, and independent verification link.

  • ✓Print or save as PDF
  • ✓Clear confirmation details
  • ✓Direct public verification
C

ChainProof

Certificate of Permanent Timestamp

SAMPLE

Protected file

important-agreement.pdf

Confirmed
Created
July 11, 2026
Proof Reference
CP-8F2A…91D4
Digital Fingerprint
6d7fce9fee471194aa8b5b6e47267f03…

Your private workspace

Saved Proofs

Proofs saved privately in this browser on this device.

Your saved proofs will appear here

Create a free proof above. It is saved only when you continue toward a permanent timestamp.

Check any ChainProof record

Confirm a file is authentic

Compare a file with its saved proof, then independently confirm its permanent timestamp.

Confirm the permanent timestamp

Confirm that the selected proof has a matching public record on Bitcoin SV.

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