Assuming that the current BTC price is 60,000 USDT, MODEN estimates that at least 100 BTC can be mined in the next year. At the same time, MODEN predicts a market decline over the next year, and plans to sell 100 BTC at a price of 60,000 USDT in advance. So MODEN pledged the mining machine on the cryptocurrency exchange to borrow 100 BTC at an annualized rate of 24%, and sold it at a price of 60,000 USDT to get 6,000,000 USDT. As predicted, the unit price of BTC fell to 20,000 USDT after one year. At this time, MODEN mines 100 BTC, but the value has dropped to 2,000,000 USDT. However, MODEN locked the value of BTC by borrowing BTC and selling it one year ago, and earned an extra 4,000,000 USDT. Finally, after deducting the interest that needs to be paid back to the cryptocurrency exchange 24BTC (the total value at this time is 480,000USDT), MODEN gets 4,000,000 USDT - 480,000 USDT = 3,520,000 USDT as profits, even deducting electricity cost, operation cost and other cost, the profit has achieved the maximization.