[hombre_fatal]

Also, one thing HNers get fundamentally wrong is that anybody cares about trust/authenticity. And I don't see what's so special about photo/video.

One of the most common forms of submissions on Reddit/Twitter is an image with text, or a screenshot of a tweet, or a screenshot of a headline that makes a claim, and everyone takes it dead seriously.

Almost nobody is going "hmm let me look this up first to see if it even exists or accurately represents the facts".

So if all you need is an image of text for people to believe it, what does it even matter if you have this sophisticated system where you require photos to be signed by camera hardware or whatever? You aren't even putting a dent in how bullshit spreads.