C2PA
Coalition for Content Provenance and Authenticity. Adobe + Microsoft + BBC etc. Signed manifests bind content to creator + edits.
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Watermarking
Statistical watermark: bias token selection in imperceptible pattern. Detectable with key. Kirchenbauer et al 2023.
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Metadata signing
Attach signed EXIF-like metadata: model version, prompt hash, timestamp. Verifiable chain.