"Bro, I lost my three million U in the blink of an eye."

On the other end of the phone, his voice was hoarse and weak, "Just watched my balance suddenly drop to zero... I never authorized anything."

This isn't a typical liquidation of a contract or a platform risk event, but a unique tragedy in the crypto world—asset theft. After reporting to the police, their response was quite perfunctory: "Maybe someone else took your phone."

Only after reviewing the entire process did I realize that the hidden dangers had long been buried in daily details: the system hadn't been upgraded in three years, the WiFi password had been used for seven years, the phone was loaded with all sorts of random apps, and most critically—the mnemonic phrase photos were stored in the phone's notes.

In the blockchain world, you might think your "safe" for assets is impregnable, but the key to unlock it is glaringly exposed. As someone who has long monitored crypto security threats, I often tell those around me: "Learn to protect yourself first before thinking about making big money."

Too many people only think about tenfold or hundredfold returns, but they put their hard-earned assets behind a fragile defense line. Today, we won't talk about coin prices; instead, let's discuss three ironclad rules for asset protection:

**First: Mnemonic Phrase Management — Paper Storage, Permanently Offline**

Never store it on any electronic device. WeChat, notes, cloud drives, screenshots—all are forbidden zones. Imagine sticking your house key on the community bulletin board—that's the risk you're taking. The only way is to write it down with a pen, keep copies in two secure locations, and never let them contact the internet.

**Second: Device Isolation — Create a Dedicated Fortress for Assets**

If your funds are substantial, it's best to prepare a "dedicated" device. This machine should only be used to operate your wallet; don't install any other software. Avoid clicking on unfamiliar links, and forget about public WiFi. Old phones and computers are cheap but full of vulnerabilities; storing heavy assets on them is like self-sabotage.

**Third: Network Hygiene — Regularly Refresh Your Defense**

Change your home WiFi password periodically, and keep your router firmware updated. Don't underestimate these steps; many hackers sneak in through the weak point of home networks. Securing your network can block up to 90% of risks.

We all love to talk about returns, market trends, or the next hundredfold coin, but few truly take the time to think, "How can I firmly guard what I already have?" In the crypto space, security isn't a choice—it's a survival requirement. Without passing this lesson, no matter how much profit you make later, it will all be in vain.