The only potential value I possibly could see to blockchain, or altenratives, is a way to attest that an image was produced by a camera's chip using a trusted platform, e.g.
https://www.psacertified.org/blog/what-is-an-entity-attestat... then putonto a blockchain where all subsequent image processing is logged and described, immutably. Then, when viewing an image on social media or news, have the ability to check the chain of events that produced the image.
Seeing what open-ai produced today, amazing videos from prompts, we need a way to trust what we see.