Here's a short field guide on the three metadata signals that out a lot of AI images: C2PA content credentials (Adobe/OpenAI/Google/MS, since early 2024), the XMP DigitalSourceType flag, and the old EXIF Software field. Including a 2026 comparison of what each major generator tags.
The method breaks the moment someone screenshots or re-saves the image, so it's a confirm-not-deny tool. Spelled out in the post.
Disclosure: I make the iOS app it references; the technique is tool-agnostic.
https://photoinvestigator.co/blog/how-to-tell-if-a-photo-is-ai-generated-metadata/
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