DOCX Content Provenance

Sign, embed, and verify C2PA manifests in DOCX files (.docx)

What Is DOCX Provenance?

DOCX document format. DOCX provenance protects business documents, contracts, and enterprise content.

With Encypher, DOCX 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 DOCX file for free, without authentication.

How C2PA Manifests Are Embedded in DOCX Files

MIME Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
File Extensions: .docx
Embedding Method: Custom JUMBF/COSE structural embedding within the OOXML ZIP container
Container Type: Custom JUMBF/COSE
Verification Pipeline: Custom JUMBF/COSE structural verification (Encypher implementation)

The C2PA manifest contains a JUMBF (JPEG Universal Metadata Box Format) store with COSE-signed claims. For DOCX files, the manifest is stored using custom jumbf/cose structural embedding within the ooxml 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 DOCX Provenance

Business documents
Contract drafting
Enterprise content
Legal drafting
Collaborative documents

How to Sign DOCX Content with Encypher

DOCX signing is available at the Enterprise tier through the unified /sign/media API endpoint. Upload your DOCX 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.docx" \
  -F "title=My DOCX Content" \
  -F "action=c2pa.created" \
  -o signed.docx

Related Formats

PDF Provenance

ODT Provenance

OXPS Provenance

Verify DOCX Provenance (Free)

Verification is free and requires no authentication. Any third party can verify a signed DOCX file to confirm its origin, check for tampering, and read the embedded rights information.

API DocumentationWhat Is Content Provenance?All Supported Media Types (44)Cryptographic Watermarking

Verify a DOCX File