It’s a cool idea, but I don’t know how much people care about a photo provably being real. I take pictures with my phone because it’s simple and convenient. I get the vibe that it’s kinda like NFTs, where maybe some people would care if certain NFTs are unique and permanently on some blockchain, but most people don’t. Most people won’t understand the technical details behind the proof so at most they can only trust the claim that a picture is provably real.