Signatures _aren't_ hard proof, they're absolutely contestable. Images and videos once were hard proof, but now are becoming contestable.
I wonder how long it will be before we see journalism-focussed photography equipment automatically generating a secure cryptographic signature for each shot. A particularly fancy implementation could be signed by both the manufacturer and the photographer, offering two assertions the shot is valid and undoctored. Going back to a reputation system still isn't great, but it's a lot better than a "pre-industrial state of discourse"
I wonder how long it will be before we see journalism-focussed photography equipment automatically generating a secure cryptographic signature for each shot. A particularly fancy implementation could be signed by both the manufacturer and the photographer, offering two assertions the shot is valid and undoctored. Going back to a reputation system still isn't great, but it's a lot better than a "pre-industrial state of discourse"