Anthropic provenance support status

Evidence, not guessing

Provenance Lens reports only what can be checked: a cryptographically signed manifest, a metadata field, a specific codepoint, a documented provider mechanism. When a signal cannot be checked, it says so. It never converts silence into a verdict.

What a report cannot prove

• A valid signature proves who signed a manifest, not that the manifest's claims are true.
• Metadata is trivially editable. Treat generator fields as an indication, never as proof.
• Hidden Unicode characters have many innocent causes, including ordinary copy-paste.

Runs in your browser

The check runs in your browser. Your file is not uploaded — it never reaches our servers. You can verify that in your browser's network tab while a scan runs.

Primary sources

• Anthropic: How Claude marks AI-generated content
• C2PA Technical Specification