I may still not fully grok what you are trying to build here. But the subject of “content provenance” is top of mind.
Curious if OP would take a look at this paper and share thoughts?
https://www.sciencedirect.com/science/article/pii/S0749597825000172
If you think this is too orthogonal a subject to your OP - I’ll move it up to a new post.
Cheers.