The C2PA Resource Page is a curated reference for musicians, rights holders, developers, and technologists exploring the adoption of content authenticity standards in the audio space. It brings together verified information about supported audio file formats, music companies participating in the Content Authenticity Initiative (CAI) and the Coalition for Content Provenance and Authenticity (C2PA), available tools for verifying and generating C2PA metadata, and open-source developer toolkits. This page is designed to support the growing need for transparent, traceable, and trustworthy audio content in an era of AI-generated media and complex distribution chains. It is not intended to be exhaustive; please reach out if you notice an omission or error.
Please note that while Catamount Music is a contributing member of C2PA, the information below is all publicly available information.
Foundations Training
The Content Credentials Foundations is a new course developed in partnership with Pixelstream to help get implementations of the C2PA standard off the ground!
Fully Supported Audio Formats
What you do on your desktop or in your studio is one thing, but when you start exchanging music, C2PA definitely plays a role. Given somewhat limited support for audio formats, we have changed our strategy. We have been to moving to WAV for full resolution audio, and MP3 and MP4/M4A only when necessary.
| Format | Encapsulation Method |
|---|---|
| WAV | XMP metadata via RIFF |
| AIF | XMP (or XMP inside ID3) |
| MP3 | XMP in ID3 |
| MP4 | UUID atom storing CBOR manifest |
Results vary for AAC, FLAC, Vorbis, Opus, WMA, ALAC, CAF.
Music Companies in CAI & C2PA
| Company | Product | Role | CAI | C2PA |
|---|---|---|---|---|
| Universal (UMG) | Music catalog ownership, publishing, and distribution | Member of CAI; part of early industry discussions on watermarking | Yes | |
| Sony | Camera firmware and AP collaboration | C2PA Steering Committee; mostly focused on imaging, possibly future audio role | Yes | Yes |
| Songtradr | Music licensing platform | Distributes music; investing in metadata and provenance tech | Yes | |
| TonicAudio | Metadata & delivery tools | Provides structured delivery metadata; CAI participant | Yes | |
| ProSoundEffects | Sound library platform | Focus on authenticated delivery of libraries | Yes | |
| Catamount Music | Boutique music publisher | Boutique composers delivering c2pa and watermarked assets only | Yes | Yes |
| AudioStack | Voice/music API & synthetic audio | Exploring provenance tools in commercial delivery pipelines | Yes | |
| Wide Blue Sound | Virtual instruments & plugins | CAI participant; interested in traceable sample-based synthesis workflows | Yes | |
| Audible Magic | Content recognition & delivery platform | Known for content ID; working on verified delivery chain for DSPs | Yes | |
| IFPI | Global industry trade organization | Public supporter of CAI & C2PA, helping coordinate industry adoption | Yes | |
| ElevenLabs | Generative voice and music | Commitment to using C2PA and protect artists’ rights | Yes | Yes |
| RIAA | Industry trade organization | Public supporter of CAI; helping coordinate music industry adoption | Yes | |
| Copyright Delta | Rights management tools | Focused on watermarking and provenance in copyright dispute tools | Yes | |
| 360 Reality Audio | DAW plugin for immersive music | Sony-developed tech; may integrate provenance features in future versions | Yes |
C2PA Verification and Generation
| Company | Product Link | Implementation |
|---|---|---|
| ContentLens.ai | ContentLens C2PA Validator (Chrome web store) | Chrome extension for verification |
| Digimarc | C2PA Content Credentials (Chrome web store) | Chrome extension for verification |
| Adobe | https://contentauthenticity.adobe.com | Browser-based generation and verification |
| Numbers Protocol | https://captureapp.xyz | Browser-based generation and verification |
I have omitted companies that include C2PA with generative AI products, like OpenAI DALL-E, Google DeepMind, NVIDIA Picasso, etc.
C2PA Developer Tools
| Toolkit | Description | Organization |
|---|---|---|
| C2PA SDK (Rust-based reference library) | Rust-based reference library for C2PA specification | C2PA working group |
| C2patool | Command line tool for working with C2PA manifests | CAI (Content Authenticity Initiative) |
| SimpleC2PA | Open-source CLI tool for manifests | Guardian Project / Proofmode |