Cryptocurrency KOL @ michaelwong123 has revealed a typical case of cryptocurrency theft committed by acquaintances. The victim is a high-income individual from a traditional industry who entered the cryptocurrency circle through a "guide" over a year ago, purchased BTC and ETH, handwritten mnemonic words and stored them in a safe deposit box. The wallet is genuine and has not been authorized by clicking on an unknown link, theoretically safe, but the assets are still stolen. After investigation, it was found that the wallet was downloaded from official channels, without unknown authorization, and the mnemonic words were not saved online. Therefore, it was suspected that an acquaintance had committed the crime, and ultimately the "insider" or guide was identified. He had secretly obtained the mnemonic words as early as when the victim copied them. In the discussion group analyzing the reasons for the theft, the suspect remained silent throughout and was only exposed after being caught. Security reminder: Download the wallet from the official website; Do not click on unknown links or authorize arbitrarily; Handwritten storage of mnemonic words, do not store on internet connected devices; Be wary of people around you, as mnemonic words/private keys may leak and assets may be difficult to protect.