> Build a system like this yourself and we'll talk about it then. Done. It's an email server. The person shipping the car takes a photograph of the odometer, e

> Build a system like this yourself and we'll talk about it then. Done. It's an email server. The person shipping the car takes a photograph of the odometer, emails it to the recipient, and then the recipient compares the photograph of the odometer with the car odometer. Any tampering which could be performed on the photo or its timestamp could be done equally to whatever log is entered into the blockchain, and the recipient knows that the photo must have been taken before the date when they received the email. And if you use gmail, it's free.