There's some cryptographic work in this direction. PhotoProof allows a photographer to prove that the image they're presenting is, e.g., the cropped version of

There's some cryptographic work in this direction. PhotoProof allows a photographer to prove that the image they're presenting is, e.g., the cropped version of the true original image they took. Video is still way out there, but at least people are thinking about this. https://www.cs.tau.ac.il/~tromer/papers/photoproof-oakland16.pdf https://www.cs.tau.ac.il/~tromer/papers/photoproof-oakland16...