Cool project indeed. I've understood that a car owner will get tokens for putting into the system information about repair and maintenance issues. But who's gonna buy this information? Second-hand buyers? Will it work like Carfax?
as far as i understood, purchases will be made between businesses, f.e. between the manufacturer and the insurance company, or the manufacturer of spare parts. there's a marketplace creating around that database, the companies will buy information about cars from each other.
The main risk I see is that the database of repair issues should be updated for a very-very long time (years, I suppose) in order to have enough information and be attractive for potential buyers.