Indeed, this concept has a concrete standard in progress (originating from Adobe, Microsoft, and the BBC) with the Coalition for Content Provenance and Authenticity (C2PA):
C2PA as far as I remember doesn't require a transparency log, but as you mention it could be a good fit as well. Besides Solana, https://transparency.dev/ could be a good option (used as part of Certificate Transparency and Sigstore).
Comments
Indeed, this concept has a concrete standard in progress (originating from Adobe, Microsoft, and the BBC) with the Coalition for Content Provenance and Authenticity (C2PA):
https://c2pa.org/
C2PA as far as I remember doesn't require a transparency log, but as you mention it could be a good fit as well. Besides Solana, https://transparency.dev/ could be a good option (used as part of Certificate Transparency and Sigstore).