I will never forget that phone call. The other person's voice was trembling: "Account balance wiped out overnight, not a single authorization record." It's not a common margin call or liquidation, nor is it a project team fleeing with funds, but assets evaporated directly—like an invisible hand has been forcibly pulled out of the wallet.

The response from the police was nonchalant: "Maybe a family member accidentally touched the phone." But we all know this explanation doesn't hold water. The real problem is hidden deep—within those seemingly trivial, everyday operations that have become routine.

Having navigated this circle for so many years, I’ve seen too many people. They get excited chasing hundredfold coins, their eyes shining, yet they casually leave precious assets behind paper-thin city gates. Today, I want to talk about not how to choose coins or analyze markets, but about three things that are far more deadly than returns.

**First Level: Your mnemonic phrase is your life gate. Never let it become transparent.**

A friend saved a screenshot of his mnemonic phrase in his phone’s notes. Later, when his account was hacked, I asked him what happened. He said maybe his cloud sync was compromised—like someone casually entered his drawer at home.

What does a mnemonic phrase represent? It’s your absolute proof of ownership of that asset. Yet most people tend to make two fatal mistakes:

First, digital storage. Screenshots on phones, sending it to oneself via WeChat, dumping it into some cloud notes… These actions are equivalent to sticking the key to your safe in the stairwell. Anyone who’s been in this industry for a while knows a hard rule: write it down physically on a real medium, like steel plates or dedicated mnemonic cards, and store them separately—this is the bottom line.

Second, exposure to environmental risks. When you get your phone repaired and the clerk glances at it, or sync data over unreliable public WiFi, or even type the mnemonic using a mysterious input method—every seemingly harmless small action could become the fuse that leaks your private key to malicious actors.

My own method might be a bit "primitive": I use a second-hand phone costing only a few dozen yuan, permanently offline, used solely for generating wallets and viewing mnemonic phrases. Don’t laugh at this low-tech approach; honestly, it’s much more reliable than 99% of the fancy browser plugins and security tools on the market.

**Second Level: Wallet segregation—don’t let your daily wallet become a hacker’s ATM.**

The logic is simple: you wouldn’t carry all your money on yourself, nor would you take your entire fortune to the market. The same applies to digital assets.

But most people’s habits are exactly the opposite—doing daily transactions, swaps, DeFi interactions—all in one wallet. The consequence is that once a certain interaction goes wrong or a particular authorization has a vulnerability, the entire asset pool is exposed to risk.

A smarter approach is to divide like this: keep the main assets in a cold wallet, the truly valuable holdings stored there and untouched for a year. Use a hot wallet for small daily operations—holding a few hundred or thousand stablecoins for trading, liquidity mining, or testing new projects. Even if the hot wallet gets compromised one day, the losses are limited. Some veterans also open a "test wallet" to try out less trusted new contracts or projects, with the rule being: don’t risk more than you can afford to lose.

This division of authority is akin to corporate financial management: operational expenses in a checking account, long-term capital in fixed deposits or real estate. If one link blows up, the other funds can still survive.

Once you understand this, you’ll see why some people remain unharmed for ten years, while others lose everything with just one authorization.