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Verify a redaction certificate

Check that a redacted PDF or its certificate was issued by PDF Redaction and has not been changed since.

How verification works

  1. Each certificate records the SHA-256 hashes of the original and redacted PDF, the number and types of redactions, and when they were made.
  2. PDF Redaction signs every certificate with an Ed25519 key and links it to the previous one in a hash chain, so records can't be changed or removed unnoticed.
  3. Drop the redacted PDF to confirm it hasn't changed, or drop the certificate to check its signature. Public keys: /api/certificates/keys/.

Certificates contain no document content: no redacted text, names or file names. We store only hashes, counts and the signature.