FTX's calculation contract is a futures contract based on the average mining difficulty of Bitcoin in a certain period of time. These futures contracts roughly reflect the whole network computing power of BTC. Among them, each power contract has a start date and an expiration date. It starts on the start day of each quarter and ends on the last day of each quarter. At the same time, the settlement price of FTX platform calculation contract is respectively: every dug block in the quarterly cycle; The difficulty of mining calculation in each block at that time; The calculation difficulty of all blocks in the average period; Divided by the four variables of 1 trillion (1,,,,,).