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.
Bitcoin cannot be considered a private currency in any way, if only because the person who created it or invented it has not been directly identified. Satoshi Nakamoto was not found either in Japan or in another state, and therefore no one has the right to claim its authorship.
Bitcoin can be considered a private currency only in the sense that, in all likelihood, it will be used primarily by private individuals, rather than legal entities.