Revain is a new generation feedback platform, mostly based on the blockchain technology that doesn’t allow to change or delete reviews and its authors get a reward for creating it! Using blockchain technology, Revain creates an economic model, which allows common users to stay highly motivated because of their token - RVN. Using the second token - R and nonlinear conversion mechanism, Revain acquired an absolutely stable internal token. And finally, due to Ethereum platform, a transparent system was created, guaranteeing immutability and incorruptibility.