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xAI Grok (Aurora) images carry no C2PA/SynthID/IPTC -- their only provenance signal is an EXIF pair: ImageDescription "Signature: <base64>" + a UUID Artist. Verified stable across 3 genuine generations (a real download previously read as unknown / "no AI metadata"). - metadata.xai_signature(): matches the Signature blob + UUID Artist pair; wired into has_ai_metadata, get_ai_metadata, and identify (platform "xAI (Grok / Aurora)"). - data/samples/grok-1.jpg: real Grok fixture (neutral content; the Artist UUID is the public image id, not PII). - Tests: synthetic-fixture unit tests, real-sample assertion, identify integration (322 passing). Docs (research refresh, May 2026): - C2PA 2.4 Durable Content Credentials (soft-binding re-discovery after the embedded manifest is stripped). - New AI-labeling laws, primary-source verified: EU AI Act Art 50 (2026-08-02), South Korea AI Framework Act Art 31(3), California AB 853. - Hedge removal claims: defeating the SynthID verifier is not forensic invisibility (arXiv:2605.09203); cite SynthID-Image (arXiv:2510.09263). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
