The pre-sale of coin pink refers to the pre-sale of coin pink before the product goes on the market. Currency Air Force means that the holder of the virtual digital currency thinks that the value of the currency in his hand will decline, so he sells or lends the currency to the trading platform, and then buys it when the price of the currency really falls, so as to obtain the difference income. Coin circle refers to the circle composed of players who discuss and trade digital currency in virtual digital currency.