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.
I have not even heard of anyone claiming that bitcoin is a private currency. In a purely legal sense, such an assertion would be incorrect, because bitcoin does not belong to any private person. With such an expression, one can agree that bitcoin will be used primarily by private individuals. States or government agencies are unlikely to make extensive use of bitcoin.