From a different perspective, understand the reasons for building national reserves of BTC/ETH cryptocurrencies. The birth of BTC originated from a replacement concept for the existing monetary system. From this perspective, the US dollar and BTC are in a competitive relationship. When BTC grows into a behemoth (such as exceeding a trillion dollar scale), the US dollar will be very passive. Taking advantage of the weakness of BTC, building a BTC reserve in the United States provides an opportunity to exert influence and prevent other countries or entities from replacing the US dollar international monetary system by controlling more BTC. Perhaps building a strategic reserve of cryptocurrencies is a defense against the US dollar international monetary system. When BTC grows large enough, the human monetary system is likely to be overturned. Therefore, for the United States, if it cannot be stopped, the earlier it takes action, the easier it is to gain an active position. In addition, if the future decline of the US dollar is replaced by other countries' fiat currency systems, then once the US dollar loses its hegemonic position, cryptocurrency systems such as BTC can be used as an alternative solution to counter other countries' fiat currency systems. Regardless of the perspective, building a reserve of cryptocurrency countries is beneficial for the United States, as it can be both offensive and defensive.