The 1usdt you mentioned is a stable token of harmony, but it has been stolen by hackers in recent days, resulting in the disconnection of the anchor. In addition, when transferring money, you need to carefully check the address, chain and currency. You can only transfer usdt to kucoin, not 1usdt. At the same time, because you choose the ETH chain, you also need to transfer it out of the usdt of the ETH chain when transferring money.