A few days ago, a friend in the circle called me, voice trembling. He said that 3 million USDT in his account disappeared in a second, and he watched helplessly as the balance dropped from 3,000,000 to zero. He didn’t authorize anything, it wasn’t a liquidation, nor did the project team run away—it's purely digital asset theft. He reported to the police, but their response made me furious—"It might be a family member's misoperation."

Later, we looked into the details together and discovered the problem stemmed from something usually overlooked. An outdated system not updated in three years, WiFi passwords unchanged for seven years, pop-up ads flooding his phone, and most critically—the seed phrase screenshot directly saved in the notes app.

We always think that security in the crypto world is like a fortress, but in reality, the keys have long been hanging outside the door. Over the years, I’ve tracked hacker techniques and often tell those around me: In the crypto world, learn to lock the door first, then think about bottom fishing. Too many people only focus on hundredfold returns, but their assets are guarded behind fragile walls.

Today, I won’t talk about market trends. Instead, I’ll share three survival bottom lines that truly concern your assets. Each one must be etched into your mind.

**Bottom Line 1: Seed phrase is as precious as life itself**

It can only exist on paper. Don’t store it on WeChat, don’t screenshot, and definitely avoid copying to the clipboard. Write it down honestly with a pen, making sure the handwriting is clear enough to read ten times over. Then hide it in two separate places, absolutely not connected to any online device. This is the most fundamental bottom line—once this is broken, everything else is pointless.

**Bottom Line 2: Large assets require a "quarantine room"**

If your assets exceed your mental warning line, prepare a clean device to manage your wallet. Don’t install random apps, don’t click unfamiliar links, and never connect to public WiFi. Old phones have more system vulnerabilities than sieve holes; using them to guard large sums is asking for trouble. The simplest method is to use a cold device, only installing necessary wallet apps, and avoid touching anything else.

**Bottom Line 3: Regularly update your defense system**

Change your home WiFi password frequently, ideally every quarter. Keep your router firmware up to date to prevent system vulnerabilities from becoming hacker entry points. Often, hackers don’t attack your wallet directly but sneak in through the home network’s side door. Leaving a backdoor for bad actors could cost you everything.

We always obsess over creating faster ways to make money but forget to learn how to brake first. In the crypto market, security isn’t a choice; it’s a matter of life and death. Your carefully planned position management and in-depth sector analysis can all be wiped out by a single careless move.

Remember this: the true mark of graduating from the crypto world isn’t how many times you’ve multiplied your assets, but that since entering, you haven’t lost a single penny.

If this sharing prompts you to check your security settings immediately, it’s more valuable than any market analysis. Everyone, secure your home first before venturing out.