In most cases it is a scam , much better to stay away and do some quality research about decent project that will adopt the blockchain technology such as Trustedcars it was founded on October 2015 it is one of the largest online shop for cars in Europe because of their huge success they have secure many partnership such a car- financing , well-known car dealership and specially with insurance & warranty companies . So we can say that this project will have a huge success because it is already in used and tested by several users !