When we use Bitcoin as a currency to pay, Bitcoin has many great features that financial technology must strive to achieve. Many hope Bitcoin can replace paper money, but in my opinion, it will be in the distant future because Bitcoin only works with Internet. At present, information technology in some places, some territories are not developed, also affected by war, strict rules ... And especially when the government does not manage Bitcoin,  The market Bitcoin  is constantly fluctuating, it can not replace the paper money completely.