Comment by snarf21

Sorry, but your solution solves nothing. The transporter could take a picture of the odometer and tweak the image. Your solution is only as secure as the input flow and you can't control it. A blockchain can't reflect physical reality. It can only reflect what someone said/says physical reality is. Additionally, they have to trust you to push the "right" data to the blockchain. If they are already trusting you, you can just run the database yourself.