To put it simply, you open short or long ETH/USD on the 58COIN exchange, and then buy and sell ETH in the spot leverage market to hedge. However, this can only be fully hedged when the BTC/USD price remains unchanged. Once the BTC price changes (it changes all the time), the hedging will not be established.

Example: Suppose your actual profit in a certain transaction is 1 BTC. At that time, the USD price of BTC was $8,000. Assuming that the USD price of BTC depreciates from $8,000 to $7,000 within a week of the transaction, the profit measured in USD will also decrease from $8,000 to $7,000. On the other hand, if the USD price of BTC rises from $8,000 to $9,000, your profit will also rise from $8,000 to $9,000.

So, once you make a profit, you convert your BTC to USD, locking in your profit as a fixed amount of USD ($8,000 in this case).