"Brother K, 3 million UST is gone... In just one second, the balance was wiped to zero, I didn't do anything!" The voice on the other end of the phone was full of despair.

This isn't a liquidation or a scam, but an asset theft incident in the crypto world that can be compared to a "digital version of home invasion." After reporting to the police, they only said, "It might be a family member's misoperation," but the post-mortem is even more heartbreaking—an outdated device system not updated for three years, a seven-year-old WiFi password, constant pop-ups from unfamiliar financial apps, and the most outrageous part is that the mnemonic screenshot was actually stored in the phone's notes.

In the blockchain world, you might think the "anti-theft door" is sturdy, but the key is hanging openly on the doorknob.

I've been observing security incidents in crypto for a long time and found a pattern: too many people focus solely on chasing 100x returns, instead of putting their assets into a "paper-thin safe." Entering this circle, you must first learn to "lock the door," before talking about bottom-fishing and profit.

Today, I want to share three ironclad rules for asset security that are vital for survival:

**First: How to store mnemonic phrases**
Only write them on paper, completely offline and isolated. Don't store them in WeChat, notes, or even think about screenshotting and saving on your phone—it's like sticking the key on the office building's notice board. The correct approach is simple: handwritten record, kept securely in two separate places, and never let it touch any connected device.

**Second: Build a secure operating environment**
If your assets are large, use a dedicated clean device to operate your wallet. Don't install unrelated software, click on unfamiliar links, or connect to public WiFi. Old devices have many vulnerabilities and are not suitable to guard your wealth.

**Third: Regularly "change the lock" on your network habits**
Update your home WiFi password on time, upgrade your router firmware. Many hackers infiltrate through the side door of the home network, and you might not even notice.

We always love to discuss how to earn faster, but neglect how to safeguard more steadily. In the crypto world, asset security is not a multiple-choice question; it's a survival foundation that must be passed. If you can't protect your principal, no matter how high the returns, they are just illusions.