Check a file
Is this the file registered for a DOI? Its fingerprint (SHA-256) is worked out in your browser — the file itself never leaves your computer — and looked up among the archived copies the records hold.
On a computer: sha256sum file.pdf (Linux), shasum -a 256 file.pdf (macOS), certutil -hashfile file.pdf SHA256 (Windows).
The same lookup for programs: api.php?action=fingerprint&sha256=… · the documentation · the Registry


