Word-of-Mouth market is worth over 183 billion dollars and over 107 million operators. Referral Marketing has created successful companies. The growing popularity of social networks has further boosted Referral Marketing by extending it to a global universe of ordinary people. However, there are problems for verifying the information of the involved parties. There is a need for a decentralized, secure, inviolable, certified database, with truthful and transparent information on the features of the companies and their operators. Giving credibility and certifying users at different levels, will support and will help the market to grow. Both private users, experts, professionals and companies, will display a blockchain certified rank on socials and websites and notoriety and reputation will spread quickly.