EPUB Content Provenance

What Is EPUB Provenance?

Electronic publication format for ebooks and digital publishing. EPUB provenance protects books, journals, and long-form digital content.

With Encypher, EPUB files carry their own cryptographic proof of origin. A C2PA manifest is embedded directly into the file, recording who created it, when, and whether it has been modified. Anyone can verify a signed EPUB file for free, without authentication.

How C2PA Manifests Are Embedded in EPUB Files

The C2PA manifest contains a JUMBF (JPEG Universal Metadata Box Format) store with COSE-signed claims. For EPUB files, the manifest is stored using custom jumbf/cose structural embedding within the epub zip container. The signing process does not alter the document content itself. The manifest is metadata, not a modification of the content.

Use Cases for EPUB Provenance

• Ebook publishing
• Digital magazines
• Academic journals
• Self-publishing platforms

How to Sign EPUB Content with Encypher

EPUB signing is available at the Enterprise tier through the unified /sign/media API endpoint. Upload your EPUB file, and the API returns a signed copy with an embedded C2PA manifest.

curl -X POST https://api.encypher.com/api/v1/sign/media \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -F "file=@example.epub" \
  -F "title=My EPUB Content" \
  -F "action=c2pa.created" \
  -o signed.epub