The free market allows the adoption of technologies that cause disruption even in its own kind of economic relations. An example of this is cryptocurrencies, which use Blockchain technology, and promises to be the future of money and means of payment. Another example is shared-economy applications, also called "Uberization", which are profoundly altering the trust-building model among unknown people. Trust is the currency in the economy of reputation. In this scenario emerges Letsfair, a platform that will use Blockchain to deliver a user-friendly technology infrastructure, aimed at businesses of all natures, for both classical and shared-economy commerce. It will address critical privacy issues for digital identities. Create an interoperable multidimensional reputation system between different businesses. Facilitate consensus among people in the division of labor and income. Besides allowing the issue of certificates of digital ownership and make negotiations for trade transactions easy.