Currently, there is no country that has recognized bitcoin as a legal tender but in the USA there have been some pronouncements in court cases about recognising it as a currency but that does not necessarily means money. Also recently Israel agree to recognise it as property among other specifics to individual countries but that does means its not accepted as we have so many exchangers that accepts and then convert to Fiat. In the future, I see more challenges coming from government because of the fact if they are unable to track the movement of bitcoin, then they will capitalise on the issue of money laundering, terrorism financing to wage a war against bitcoin.