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Content Credentials · audio

What do this recording's Content Credentials say?

Content Credentials (the C2PA standard) are a signed record that AI voice tools and some capture apps attach to a file: what made it, whether it was synthetically generated, and the edits along the way. Drop in a recording and this pulls that manifest out of the file and reads it back in plain language.

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What Content Credentials are

Content Credentials are the consumer name for a manifest defined by the C2PA specification. It is a small signed record inside the file that lists the claim generator (the app or model that produced the audio), a set of assertions such as the actions taken on it, and a cryptographic signature over the whole thing. AI voice platforms are beginning to write these so a synthetic clip can carry a verifiable origin, while an ordinary recording carries nothing.

The synthetic-generation signal

The field to watch is digitalSourceType, an IPTC code for how the content originated. The value trainedAlgorithmicMedia means it came from a generative model, which for audio means a synthesised or cloned voice; compositeWithTrainedAlgorithmicMedia means AI audio was mixed in. This tool surfaces that field and flags it directly.

What a manifest does and does not prove

A present, well-formed manifest tells you what the signer claimed and, if you trust the signer, that the audio has not changed since signing. This tool reads the claim; it does not verify the signature or check the certificate against a trust list, so treat the signing details as reported, not proven. And the absence of a manifest proves nothing: almost no audio carries one, and any re-encode strips it. Pair it with the audio metadata reader and hidden text scan for the rest of the picture.

Sources

  • C2PA, Content Credentials: C2PA Technical Specification (coalition for content provenance and authenticity).
  • ISO/IEC 19566-5, JPEG Universal Metadata Box Format (JUMBF).
  • IETF RFC 8949, Concise Binary Object Representation (CBOR).
  • IPTC, Digital Source Type NewsCodes vocabulary.