Many people's wallets are stolen, and the first reaction is:
"Is my wallet hacked?"
To be honest:
Wallets are unlikely to be hacked; it's usually something you clicked on yourself.
What's most important in the blockchain is not how much money you have,
but three things: mnemonic phrases, signatures, and authorization.
Whoever gets any one of these can access your money.
Once the mnemonic phrase is leaked, there's no point in struggling.
No freezing, no customer service, no recovery.
As long as someone gets your mnemonic phrase,
that wallet is no longer yours.
The most common issue is actually authorization.
You think you're clicking on "this time transfer 500U",
but many times you're actually clicking on:
"from now on, they can transfer as much as they want."
Moreover, authorization is not one-time;
you might not use it today,
but they can still use it six months later.
There's another trap called "signature without gas fees".
Many people feel relieved when they see it doesn't cost money.
But the truth is:
signatures without gas fees are actually the most likely to cause trouble.
You think it's a login,
but it's actually giving others permission to transfer money.
Some people find out after they are stolen (I was stolen like this last time)
that the money is still on the chain,
but they just can't transfer it away.
It's not that you don't have permission;
it's either that hackers are monitoring your wallet,
and as soon as you make a move, they snatch it away;
or the money has already been transferred into contracts or multisigs they control.
Don't be superstitious about multisig either.
Multisig just means a few more people agree together,
it prevents one person from messing around,
but it can't prevent collusion,
nor can it prevent you from authorizing messily yourself.
Multisig protects the money in the contract,
not your personal wallet.
Veteran players will always separate their wallets.
One for storing money (hardware wallet, cold wallet), where nothing is clicked;
one specifically for interactions (hot wallet);
and another specifically for testing projects and claiming airdrops.
Don't use your main wallet to gamble.
If one day you suspect your wallet is acting strangely,
remember there's only one way:
immediately create a new wallet,
grab as much as you can,
give up on the old wallet.
There is no such thing as fixing it, and no such thing as regret.
Finally, a word for my brothers:
In blockchain security, it's not about technology, but about security awareness.