Everyone has been talking about bitcoin for a long time, that it is the future dollar, that it is a competitor of the dollar now and will replace it in the future, but no one talks about other currencies and tokens, for example, can we call Ethereum a replacement and competitor of the yuan? Or, for example, Neo, which was developed by the Chinese to replace their currency. Can Solan, for example, become a replacement for the British pound? Can a separate cryptocurrency be the only substitute for the currency of a specific state?