"Brother Xiao, I lost my 3 million U, it was just a one-second thing."

A hoarse voice came from the other end of the phone, mixed with regret and despair, "Just watched the balance go from full to zero. I never authorized any operation."

This situation in the crypto world is called asset theft or hacking, even more heartbreaking than liquidation, because it’s not the market’s fault. But after reporting to the police, they just said: "It might be a family member’s mistaken operation."

Later, when I looked back at the chat records, I realized the problem had been buried in daily life all along—three years without an OS update, using the same WiFi password for seven years, having all kinds of random apps on the phone, and the most ridiculous thing was saving the mnemonic phrase as a screenshot in a notes app.

This is reality: no matter how secure your assets are, the keys are right outside the door. Over the years, I’ve been studying various hacking methods, and my biggest takeaway is—entering this circle, you first need to learn to "lock" yourself, then think about bottom-fishing and doubling your investments.

Too many people focus all their energy on finding the next hundredfold coin, instead of protecting what’s most valuable. Today, let’s not talk about K-line charts or market trends, but focus on three ironclad rules that can truly save your assets:

**1. Never touch your mnemonic phrase online**

Screenshots, cloud storage, sending it to yourself—these actions are equivalent to taking a photo of your house key and sending it to hackers. The only reliable method is to write it down on paper, then split it into two parts and store them in two relatively secure places. Not showing off, it’s really that simple and straightforward.

**2. If your assets are large enough, use a dedicated device**

Buy an old, cheap phone or computer, install your wallet app, and then leave it completely idle—don’t install anything else, don’t click on unfamiliar links. Let it do only this one thing. This approach might be a bit extreme, but for holdings in the millions, it’s the safest.

**3. Don’t neglect your home network security**

WiFi passwords that haven’t been changed in three or five years, routers that have never been updated—these are bombs hidden in the corner. Regularly change to complex passwords, update your router’s firmware periodically—just like changing the locks on your door regularly. These are basic skills.

In this circle, security isn’t an extra point; it’s the bottom line for survival. Everyone is researching how to make more money, but whether you can protect what you’ve already earned determines if you end up winning or losing.