The new century has brought lots of exciting and useful things to our life to make it easier, brighter and safer. Within just a couple of decades the world has started using what people only used to see in science fiction stories some thirty or forty years ago. Today we can't imagine our life without social networks, tablet computers, online stores, cellphones and tons of other latest inventions, which have penetrated in all spheres of life, including economy. Cryptocurrency is one of the most important economic inventions of the past decade. Although the first cryptocurrency was created by a programmer, not an economist, the idea of cryptocurrency itself was so great that millions and millions of people all over the world use cryptocurrencies every day to make and receive payments, keep their savings and earn additional money from exchange rate fluctuations.