Yu Xian, the founder of Slow Fog, said that four sets of mnemonic words were leaked by a user, and the funds in the corresponding four wallet addresses were stolen. Judging from the on-chain operation method, after the hacker's address received the funds, all of them were changed to ETH, and then washed away through FixedFloat. The longer the mnemonic word/private key is used and distributed to the more people, the more likely it is to be leaked, and the more difficult it is to find out the cause of leakage.