"$3 million U, gone in a second..."

That phone call left a deep impression— the other person's voice trembling and distorted, "Watching my balance jump to zero right before my eyes, I didn't authorize anything!" No liquidation or scam, just naked digital assets being stolen. What's the result after reporting to the police? A vague excuse: "Maybe a family member operated it by mistake."

The truth that was uncovered later is even more heartbreaking: an outdated system not updated in three years, WiFi password unchanged for seven years, layers of pop-up "financial management software"—and the most fatal one—mnemonic phrase screenshots stored in the phone's notes.

This is the real picture of the crypto world. You think you're using a security door, but in reality, the key has long been hanging on the doorknob. After studying hacker techniques for so many years, the one thing I often say is: "To survive long in the crypto world, you first need to learn how to close the door." Too many people focus solely on chasing hundredfold returns, only to leave their assets behind a "paper-thin city wall."

Today, we won't talk about market trends, just three things that truly concern your assets:

**First: Rules for storing mnemonic phrases**

Don't store them in WeChat, don't screenshot, and don't let them touch the clipboard. The only way—write it down with a pen. Keep it in two separate places, ensuring it never touches any connected device. This is the bottom line—no room for negotiation.

**Second: Divide your assets into "rooms"**

Once your assets exceed your psychological threshold, you need a clean, dedicated device to run your wallet. No unnecessary software, no clicking on unfamiliar links, no connecting to public WiFi. Some like to use an old phone as a cold wallet? The problem is, the vulnerabilities of old devices are like sieves—impossible to keep the money safe.

**Third: Regularly "change the lock"**

Change your home WiFi password frequently, and update your router firmware in time. You might not realize it, but many hackers sneak in through the side door of your home network.

We always focus on building faster cars, but forget to learn how to hit the brakes first. No matter how sophisticated your position management or how deep your track analysis, you can still lose to a careless operation.

The true sign of "graduation" in the crypto world? Not making several times or dozens of times profit, but never losing your assets from the moment you entered until now. If these words prompt you to immediately check your security settings, their value surpasses all market predictions.