We present you a Skychain project. Skychain is an infrastructure blockchain project aimed to host, train and use artificial neural networks (ANNs) by market participants. First years of Skychain development will be devoted only to medicine to help doctors and patients have accurate diagnoses using this system. Skychain is a "sharing economy" project, it means that each member of the Skychain ecosystem will provide his resources and thus create a product that is ahead of any competitors. In its turn, the system will reward each participant with high benefits. Skychain is a project that will "uberize" artificial neural networks, but with developers of individual ANNs instead of taxi drivers, consumers of ANNs (doctors and patients) instead of passengers and computers and server of miners instead of cars. In the future, Skychain may be used for building, fast distributed training and further use of a wide range of neural networks not only in medicine. IBM estimates the artificial intelligence market in the sphere of medicine at $200 billion a year in a few years. The goal of Skychain is to take control over 70% of this market! The way to achieve this goal is to create the best open infrastructure that will accumulate the resources of the majority of participants of this industry and surpass any closed corporate product.