Verify a proof
Verify the authenticity and date of a ProofStamper proof
How does it work?
- The .tsr file is the technical proof of the timestamp
- Verification compares the file to the timestamped fingerprint
- If the file has changed, the proof fails
Why verify a document?
Understanding the importance of integrity verification
Frequently asked questions
- What should I do if the fingerprints don't match?
- If the fingerprints are different, it means the document has been modified since its certification. You should:
- Is the certificate legally valid?
- The RFC 3161 timestamp used by ProofStamper is internationally recognized. It uses a third-party certification authority (FreeTSA) that guarantees the independence of the proof. However, legal validity may vary by jurisdiction. For high-value legal documents, consult a legal professional.
- How long does the certificate remain valid?
- The certificate remains valid as long as the cryptographic algorithms used are considered secure. SHA-256, used for the fingerprint, is currently considered secure for several decades. The timestamp token included in the certificate allows proving the document's existence at a specific date, independently of ProofStamper.
- Can I verify a document certified by someone else?
- Yes! That's exactly the point of the system. Anyone with the certified document and its certificate can verify the authenticity and date, without needing access to ProofStamper or the issuer. This is what guarantees transparency and trust in the process.
- Are my documents stored somewhere?
- No. ProofStamper processes your documents entirely in your browser. No file is sent to our servers. Only the cryptographic fingerprint (SHA-256) is sent to the timestamp authority to obtain the RFC 3161 token. This fingerprint cannot be used to reconstruct your document.