In which country are they CONSIDERED A CURRENCY?
Your source does not provide that information.
Actually, it does, but since you won't bother reading it: Germany and the United States are notable examples. I already showed you a California law about
alternative currencies (of which Bitcoin is one, but you pretended that it's not one).
I'll take pity on you and stop trolling you for a moment. It would seem that you've picked a very specific definition of "currency", but failed to specify it, which is what is stopping you from succeeding here.
https://en.wikipedia.org/wiki/CurrencyIf by "currency" you mean "banknotes", then Bitcoin is not a currency, and neither is the money you store with Best Bank Plc. If you mean a system of money, then it is one, by the virtue of it being used as one.