For me, as of now it serves as an international currency. Why I said so? It is becayse bitcoin is widely used on a lot of cluntry in the world. Tgey either use it as an alternative for money in the internet, or as a form of investment. Which I might say is wise.
Germany is the first country in the world to recognize bitcoin, requiring citizens to pay taxes or use it for other purposes. But not in China, you can only play on a trading platform such as firefly. This depends on the different national conditions of each country different policies.