The legitimacy of the crypto currency provides misty seen to everybody. Heard that it is legal in some countries. However it cannot maintain the legitimacy since we must following the traditional financial currencies system guideline and policy. But think it over. In ancient age, people using material change concept. The revolution of the change since the printing currency depends on country’s gold deposits. Perhaps 80’s we do not have key terms so called digital transformation. From technical point of view, there is no technical issue on printing currency depends on country’s petroleum (Oil). This theory now came true. Venezuela is the 1st country issues crypto currency. The specification of the crypto currency is the oil-backed token as a form of legal tender. It looks that such theory is the alternative solution let’s some countries evade international sanction. From scientific perspective this is the correct way. Why we need to keep a classic financial technology without end of life cycle. Iran is considering the development of its own cryptocurrency now (see below url for reference).