> But lets say I am a reputable account posting a (faked) photo of you and Marty doing something illegal, how does nostr help you challenge the veracity of that photo? YOU CANNOT CRYPTOGRAPHICALLY PROVE SOME THING DOES NOT EXIST, ONLY THAT SOME THING EXISTS. IT DOES NOT MITIGATE THAT UNLESS THE PHOTO IS A MODIFIED VERSION OF AN ALREADY EXISTING PHOTO THAT WAS HASHED AND SIGNED.