The essential attribute of currency is the Unit of Account, its core function is as a medium of exchange (payment tool), and its fundamental manifestation is as a value token with the highest liquidity (which requires the highest authority or credit endorsement or protection). These are the three indispensable elements for understanding currency, which have remained unchanged throughout history (if changed, it would no longer be currency). However, the carrier or form of currency (such as shells, coins, paper money, deposits, electronic wallets, Digital Money, etc.) and its operational methods need to be continuously improved in order to enhance efficiency, drop costs, tighten risk control, and better serve the function of currency in promoting exchange and economic social development. Therefore, it is essential to have an accurate grasp of the essence and operational methods of currency. First, as a Unit of Account, the most fundamental requirement for currency is to maintain basic stability of the currency's value. This requires that the total amount of currency must change in accordance with the changes in the total value of tradable wealth valued and settled in currency, maintaining a basic stability in the overall correspondence between the total amount of currency and the total value. From the perspective of the entire society, the total amount of currency overlaps with the total value of tradable wealth, wherein the wealth value is the real basis, and currency is merely a representation of wealth value (unit of measurement), representing the claim to wealth value; currency is not wealth itself. Therefore, the economic form represented by the generation and operation of wealth is referred to as the "real economy", while the economic form represented by the investment and operation of currency (including derived financial activities) is referred to as the "virtual economy". Without the value support of real wealth, currency will be worth nothing. Of course, for social individuals, currency represents a claim to value, which indeed belongs to their assets. The dual attribute of currency as "entirely virtual but individually real" can indeed confuse people’s understanding of currency, requiring careful explanation and accurate grasp. To maintain the basic stability of currency value, all physical assets (like gold with finite earth reserves) or virtual assets (like Bitcoin, whose total supply and phase increments are completely locked by the system and cannot be adjusted) that serve as a limited supply of currency will all...