Bitcoin in many respects fulfills the functions that money should meet. In my opinion, however, it does not fulfill all the functions of money. Therefore, I am reluctant to call him money. I think, however, that money is what money is acceptable. So if in a given transaction someone accepts bitcoin as money, then he performs the function of money for this transaction. However, it is difficult to compare bitcoin with money issued (in the case of Poland) by the NBP.