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The security bottom line of self-custody wallets is actually very simple: the mnemonic phrase should always be stored only on your own device, and must never be shared, backed up to the cloud, or exposed to third parties.
Once this boundary is loosened, trouble arises. Mnemonic leaks, screenshots, cloud backup records—if any of these steps go wrong, your assets are essentially exposed to risk. Not to mention those seemingly convenient wallet custody services, which on the surface help you manage your assets but in reality are equivalent to handing over your private keys to others.
Therefore, to truly control your assets, you must maintain this boundary. Local device, known only to you, with no backup vulnerabilities—these three points are indispensable.
In the end, it all comes down to one thing: private keys should only exist in your mind or on paper.
People who use wallet custody services are really gambling—betting that exchanges won't run away, betting that their security teams are reliable. I wouldn't gamble on that.
The worst are those who store it on their phones and even take screenshots to share with friends. I always want to slap them when I see that.
Self-custody may seem troublesome, but this one hassle can save your life.
By the way, does anyone still use custodial wallets? They're just waiting to be exploited.
You really shouldn't mess with mnemonic phrases; a simple screenshot is enough to compromise them.
Strictly speaking, if you don't hold the keys yourself, don't claim to have coins.
Just maintaining this boundary is already difficult, not to mention protecting against screenshots and shoulder surfing.
That's why I prefer the hassle of storing paper wallets in a safe.
Human nature is to seek convenience, and in the end, we realize that convenience and security are often mutually exclusive.
A mnemonic phrase is essentially the key to your vault; whoever holds it is the boss. Don't expect a perfect solution—just keep it safe yourself.
Many people are still using custodial wallets, and I really don't understand. Isn't that just handing your keys to someone else? Can you trust that?
This article is correct, but the key is that many people simply can't do it. Self-discipline is something that, for crypto people, is even more difficult than BTC hitting a new all-time high.