Have always wonder which currency would the world accept if only one currency was to be used. Maybe the dollar?, don't think so, The British won't tolerate that.
Cryptocurrency?. Maybe. Until the advent of cryptocurrency, I never thought that would be possible but it seems possible.
The world is not too far from a unified currency.
Cryptocurrency is only an alternative means and cannot be used as one world currency, because no single country regulates it. One world currency will still be held by the Dollar because this currency is the most stable currency and is used as an international currency