There's simply no technical solution to authenticating photographs as far as I can tell.
The only real solution I can think of is just to have multiple independent parties photograph the same event and use social trust. Luckily this solution is getting easier now that almost everyone is generally no further than 3 feet away from multiple cameras.
you know what grinds my gears? The fact that it takes 2 seconds for the android camera app to open, even when I use the shortcut on the lock screen. It's a step backwards from point-and-shoot cameras.
I was trying to take a picture of a gecko the other day, and it missed half of the event while the app was loading.
The only real solution I can think of is just to have multiple independent parties photograph the same event and use social trust. Luckily this solution is getting easier now that almost everyone is generally no further than 3 feet away from multiple cameras.