A little egotistic to think that Aliens will conform to our societal traditions and beliefs, money and economy included. Matter of fact, who's to say that they are even using money from where they live? perhaps some advanced civilization from the outskirts of the deep space have figured out how to live harmoniously without killing your kin for resources or money. Perhaps they don't have the concept of money and are literally doing the barter method since time immemorial. Or perhaps, they have made a much better form of currency system that would span lightyears and lightyears away without compromise? These are little theoretical brain exercises but it begs the question of not whether these aliens are going to be accepting of bitcoin or money thereof, but of if they will be willing to conform to human values and ideas.