Verify a document.
Every report and attestation the firm issues is registered by its unique SHA-256 fingerprint, and so are the published samples. The check shows whether a file is authentic and unchanged, and whether a newer edition has replaced it.
- What it provesThat the file is byte for byte one the firm issued, and whether a newer edition has replaced it.
- What it does notThat the findings are right. The report’s own evidence and method carry that. The register entry names no client and no date.
- The file is not uploadedThis browser reads the file and calculates its fingerprint on this computer. Only the fingerprint is sent. It is 64 characters, sent as an ordinary web request and checked against the register. This page stores nothing. Like any web request, the lookup can appear in the server’s logs with the requesting address and the time.
- A changed file failsOne changed character gives a different fingerprint. The PDF is the most reliable file to check.