Some people do care about authenticity though, hence the genesis of the OP's work to try and authenticate and it's why people still read news papers vice trusting their clickbait Google "news" feed. I'm just saying that I'd trust some encryption cert (whatever it is) traced back to a known more reputable source (say Financial Times and the like) than an algorithm that is just guessing that a photo/video is an un-altered genuine original vice a fake.

The challenge is establishing an author's credibility in the first place. If I trace a cert back to joe schmo off the street or some empty front business, then I'd probably not trust the content.