[makeitdouble]

There are dedicated apps (for insurance companies etc.) that will certify the photo by taking it straight from the camera feed and sign it.

That still allows to shoot fake subjects. Let's say you build the image on a high resolution screen and shoot it from the app with low resolution, you get a certified fake photo. Making the room too dark for good ISO, or purposefully shake the phone for instance should be enough to significantly lower the details if the app accepts the shot.

But at least, part of the pipeline is secured, in the sheer "this photo was not edited afterwards" sense.