According to official sources, OKEx will systematically upgrade ETH and BTC delivery contracts in the near future. The upgrade time is: ETH delivery contract: October 9th, 2019, 11:00 (HKT); BTC delivery contract: October 10, 2019, 11:00 (HKT). The upgrade time is expected to be about 30 minutes. During the period, the delivery contract for the corresponding currency will be suspended. The user cannot place the order, and the related functions such as margin, transfer and transfer can still be used.