Personally, I think the definition of currency is unclear. If its not "legal tender", or in other words not officially declared as money accepted for paying taxes (by fiat) , then shouldn't it NOT be considered a currency, in the same way that Gold is not considered a currency (unless it is officially stamped as such by fiat). To be a currency, some official government must declare it as official for paying taxes IMHO. So, for a judge to declare Bitcoin as a currency is ridiculous because, for it to be so, he himself would have to be willing to accept it , and then turn around and pay taxes with it.