I received a friend's tearful call in the early morning and was immediately struck with a wave of palpitations—he had painstakingly saved up assets for three years, without liquidation or scams, and suddenly everything disappeared in an instant, with his account balance wiped clean.

"I really didn't do anything! I didn't click on any unfamiliar links, nor did I authorize anyone, yet I watched everything go to zero right before my eyes." His voice was trembling, and he even reported it to the police. The police's response was so absurd it made people laugh and cry: "Could it be that a family member accidentally operated it?"

This is clearly not a case of accidental operation. It’s a precise digital hunting attack.

After he finished explaining his daily habits, I almost burst out laughing in anger. Not updating the system for three years, not changing the WiFi password for seven years, and installing more pop-up ads on his phone than actual content—most astonishingly, the core mnemonic phrase was actually saved as a screenshot in his phone’s notes. In other words, he’s like leaving the house key in the lock with a "Welcome" sign stuck on the door.

Having been involved in the crypto market for so many years and dealing daily with various hacking techniques, I’ve grown tired of saying this: compared to researching how to bottom out and double your investment, the first lesson is to learn how to "lock" your assets properly. Too many people focus on the fluctuations of K-line charts but leave their life savings in a paper house that can be broken with a single poke, ending up losing everything inexplicably and blaming the market’s brutality.

Today, I won’t talk about market trends or promote coins; I want to share some real security tips—lessons learned from countless theft cases, each of which can help you avoid 90% of the risks.

**Tip 1: Never keep your mnemonic phrase on a digital device**

Absolutely do not store your mnemonic phrase on any connected device. Screenshots, notes, cloud sync, emails—these are all dead ends. I’ve seen the most ridiculous practice where someone stored their mnemonic phrase on their phone, only for a malicious app running in the background to wipe everything out.