Just imagine: only a hundred years ago, countries used gold for mutual settlements. And only by the middle of the 20th century began to peg the currency to the US dollar. Even later, they introduced such a concept as "floating" courses. Gold has replaced commodity barter, paper money has replaced gold. With such rapidly changing methods of settling trade between states, Bitcoin may well replace paper money and become something like a cryptocurrency standard. To recognize the coin at the international level, the consent of all countries to a single one is not needed. Only the participation of several leaders, to which their dependent countries and allies will join, will suffice. And after that, along with the dollar, they will start using Bitcoin everywhere and, perhaps, other cryptocurrencies at a fixed rate.