C2PA
Best for signed provenance, integrity validation, manifest actions and certificate-chain interpretation.
Comparison
C2PA records signed provenance and integrity evidence. Watermarking places a visible or invisible signal in content. They solve different parts of a review workflow.
Best for signed provenance, integrity validation, manifest actions and certificate-chain interpretation.
Useful in specific workflows, but it should not be confused with C2PA signed evidence.
Use both where appropriate, while keeping the limits of each signal clear to users.