I just saw the viral case in the group about "3 million stablecoins disappearing overnight," and I immediately closed the market app. Instead of watching the K-line for ups and downs, it's better to take seriously this recurring nightmare in the crypto world. There are no hacks or advanced techniques involved; it all comes down to a simple mnemonic sharing incident, which wiped out a million-dollar fortune.

Many people discuss this by focusing on superficial reasons like "family disputes" or "operational mistakes," but after eight years of navigating the crypto market, I want to say: once the mnemonic leaves offline storage and enters any connected device, the fate of that asset is already sealed. Today, I won't talk about market trends; instead, I’ll share the most realistic survival rule — your understanding of risk determines how long your assets can survive.

**1. The Deadly Misconception: Treating Mnemonics as Passwords**

At least 90% of newcomers have no idea what a mnemonic is. This is the root of all tragedies. To put it plainly, a mnemonic is not an "enhanced password," but the "genetic code" of your entire crypto assets — every private key and wallet address derives from it. Once leaked, hackers don't need to crack any algorithms; they can fully copy your wallet permissions within minutes, even erase all transaction records, leaving you with no clues for investigation.

Look at the details of this case: the husband stored the mnemonic in WeChat, and the wife copied and pasted it using an old Android phone. Every step in this process opens a door for hackers. WeChat's cloud synchronization itself contains risks, exposing the mnemonic on cloud servers; combined with the vulnerabilities of outdated Android systems, such as listening, interception, and clipboard access... these vulnerabilities are open backdoors for professional hackers.