It's a nice idea, by the way. It may help a lot car buyers and car sellers as well. I will you support project if you start it.
Thank you in advance 
BTW, we got new interesting research from other huge companies, already start to work in this area.
For example Bosh:
RU post https://bel.biz/trends/shtefan-hartung/
EN post https://www.ethnews.com/bosch-using-blockchain-technology-to-stop-illegal-mileage-manipulation
So, a lot of companies start to dig deeper in this area, and car history verification is still very exciting...