SlowMist Cosine: The longer and more widely mnemonic phrases/private keys are used online, the more likely they are to be leaked and difficult to trace.

BlockBeats News, May 31st, SlowMist founder Cosmos said that a user's four sets of mnemonics were leaked, and the funds in the four corresponding wallet addresses were stolen. From the on-chain operation method, after the hacker address received the funds, they were all converted to ETH and then laundered through FixedFloat.

The longer the mnemonics/private key are used online and the more they are distributed for shared use, the more likely they are to be leaked, making it increasingly difficult to trace the cause of the leak.