Virtual money such as bitcoin is now in widespread use in many countries, but there is a good future for virtual money in the 4.0 era. It is not unbelievable about the power of virtual money, but in the age of 4.0 one needs a basis to make sure that bitcoin exists and grows, or just as a wind passes by and goes into oblivion . Have you ever thought about the basis of need and enough for bitcoin to grow?