[michaelmrose]

Why would the blockchain help here? Basically you need public private key pairs where the private key exists only in silicon and the public key is associated with a serial number. Normally the serial number is trivially associated with the customer who ultimately purchases the hardware especially if the camera is part of a phone with an active plan.

It seems like this trivially works better with a centralized database especially since you don't necessarily want to make all of this data public. The general public needs to know that this is a true and accurate photo that hasn't been edited taken on such and such a date. The authorities with a warrant might well need to know that it was taken by a device owned by bob.