1. (1) What is a fiat currency standard First of all, we need to understand how our fiat money enters the cryptocurrency market. We need to enter the cryptocurrency market through the OTC market (Over-the-CounterMarket, known as fiat currency trading or C2C trading on OKEX and huobi) to buy digital assets (such as BTC, ETH, USDT, etc.) with fiat currency and then transfer them to the exchange for trading. When you leave the market, you then sell the digital assets from the OTC market for fiat...