CAI’s Content Credential standard accommodates what you suggest, as far as re-signing/provenance, with a chain kind of approach. It supports embedding “ingredie

CAI’s Content Credential standard accommodates what you suggest, as far as re-signing/provenance, with a chain kind of approach. It supports embedding “ingredient thumbnails” in an image’s manifest, and/or the image’s manifest can embed or link back to source images that are in turn also signed [2]. It feels like the approach assumes a media environment where a professional wants to provably “show their work,” where authenticity adds value to a skeptical audience. In that spirit, then, I understand CAI’s intention [0] to be to vest that judgment with the creator, and ultimately the viewer: if my purpose is to prove myself, I’d want to show enough links in the chain that the viewer checking my work can say “oh I see how A relates to B, to C,” and so on. If I don’t want to prove myself, well… then I won’t. I don’t know Adobe’s implementation well enough to know how often they save a CC manifest, and their beta is vague in just referring to “editing history.” [1] I get the impression that they’re still dialing in the right level of detail to capture by default. Maybe even just “came from Firefly” and “Photoshop wuz here.” But if I want to prove this Nikon Z9 recorded these pixels at this time and place, or “I am the BBC and yes I published this,” or “only the flying monkey was GenAI, the rest was real” I could conceivably put together a toolchain (independently of Adobe) to prove it in more detail. [0] https://spec.c2pa.org/specifications/specifications/2.2/specs/C2PA_Specification.html#_principles https://spec.c2pa.org/specifications/specifications/2.2/spec... [1] https://opensource.contentauthenticity.org/docs/manifest/understanding-manifest/#:~:text=Creating%20or%20editing%20an%20asset%20using%20a%20C2PA%2Dcompliant%20device%20or%20tool%20(for%20example%20Adobe%20Photoshop)%20adds%20a%20new%20manifest%20to%20the%20manifest%20store. https://opensource.contentauthenticity.org/docs/manifest/und... [2] https://opensource.contentauthenticity.org/docs/c2patool/docs/usage/#saving-manifest-data-to-a-directory https://opensource.contentauthenticity.org/docs/c2patool/doc...