After reading the replies from Twitter friends, none of them are correct; only a few are somewhat relevant, and the core issues have not been addressed. To summarize, the replies from Twitter friends can be categorized into a few types:

~ The mnemonic phrase is generated using pseudo-random numbers. Even if it is pseudo-random, it just lacks security. I am talking about cold wallets not being connected to the internet to steal private keys, which has nothing to do with random numbers; even true randomness can still be stolen!

~ During firmware upgrades, private keys are transmitted to the phone or computer. What if customers, like me, never upgrade?

~ Not buying the manufacturer's cold wallet and making one with a phone has a lot of issues (based on personal testing). I don't want to elaborate; if you make it yourself, if the wallet developer wants to steal the private key, they can still do it.

~ The mnemonic phrase + address is pre-set. Those who say this are beginners. I don't generate the mnemonic phrase with a cold wallet; I imported the mnemonic phrase. What should I do?

It seems that everyone’s understanding of cold wallets is still somewhat superficial. The wallet is the closest place to money, especially large sums of money, and it is very difficult to recover large amounts. In the face of big money, no one can be trusted.

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