States do not approve of bitcoin or other cryptocurrencies. They can legalize or ban her from walking on their territory. Legalization takes place by determining the legal status of cryptocurrency and establishing the order and conditions for its circulation in society. At this time, many states have already legalized bitcoin, however, of course, not yet as massively as we would like. At the same time, it must be said that states are unlikely to actively support the cryptocurrency. They can legalize, but not actively support.