OTF Content Provenance

Sign, embed, and verify C2PA manifests in OTF files (.otf)

What Is OTF Provenance?

OpenType Font format, the industry standard for cross-platform typography. OTF provenance protects font intellectual property and licensing.

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

How C2PA Manifests Are Embedded in OTF Files

MIME Type: font/otf
File Extensions: .otf
Embedding Method: Custom JUMBF/COSE structural embedding in OpenType font tables
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 OTF files, the manifest is stored using custom jumbf/cose structural embedding in opentype font tables. The signing process does not alter the font content itself. The manifest is metadata, not a modification of the content.

Use Cases for OTF Provenance

Type foundries
Font licensing
Brand typography
Publishing fonts

How to Sign OTF Content with Encypher

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

Related Formats

TTF Provenance

SFNT Provenance

Verify OTF Provenance (Free)

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

API DocumentationWhat Is Content Provenance?All supported formats (85+)Cryptographic Watermarking

Verify a OTF File