You're not testing what you think you're testing. We can verify an image, but still have problems with the story below the image. I don't think this should be half-solved, it would give false credence to real images used in lies. Or the reverse, you discredit a fake image of Musk you saw yesterday, but tomorrow he does it for real.
You'd need to give political campaigns' keys some trust, for images you expect from them. But what if they start signing images that you wouldn't expect from them, then you have 'verified' fake news.
You'd need to give political campaigns' keys some trust, for images you expect from them. But what if they start signing images that you wouldn't expect from them, then you have 'verified' fake news.