I think bitcoin is a world currency not a private currency and because he does not hold by the government and does not have tax.. and i am agreed for this currency. so all people are wrong tell us bitcoin is a private currency.
At least now bitcoin becomes an individual currency if indeed in its country it has legalized it, because some countries still have not accepted it for the entry of bitcoin, maybe someday it will happen to become the world currency, because it will be very easy to trade or buy the country into the country other things