I guess the weakpoint in all of these techniques to prove a photo was taken by a certain device, at a certain time, in a certain place is for someone wearing a

I guess the weakpoint in all of these techniques to prove a photo was taken by a certain device, at a certain time, in a certain place is for someone wearing a very good disguise to publicly commit crimes in your name. Any witnesses or photo evidence is going to point to you. A full movie costume makeup kit probably costs less than what it takes to hack Apple for someone's iPhone private key.