Proof of Publish Documentation

Build a C2PA signing workflow with the Proof of Publish documentation. Start with account setup, learn how supported files are signed, and understand what verification can establish about a file and its credential.

Use the REST API reference for custom publishing systems or follow the WordPress setup guide for supported image attachments. C2PA provides tamper-evident content binding, signing-time evidence, and signed publisher-supplied metadata; it does not establish identity, authorship, origin, truth, or first publication.

Troubleshooting and frequently asked questions explain file limits, API responses, credentials, and integration behavior so teams can evaluate and operate the service accurately.