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C2PA content credentials

Every asset carries a provenance manifest. Unsigned without a certificate — and it says so.

Needs: An X.509 signing certificate for signed manifests. Without it this feature reports that it is unavailable rather than failing silently.

Every asset carries a C2PA 2.1 manifest recording the model, seed, parameters and references used to make it, plus AI-generated labelling.

Without a signing certificate the manifest is unsigned, and it is marked unsigned. An unsigned manifest still carries the provenance data and is still useful; presenting it as signed would be a false authenticity claim, which is precisely the thing C2PA exists to prevent.

To sign, provide an X.509 certificate. Everything else already works.

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