Discovered a security flaw in some wallets


Some wallets are backed up by the backend
For example, when you switch to a new iPhone, it shares data from the old phone
Wallets cannot be shared directly and need to be re-imported with a mnemonic or private key
But some wallets can be shared directly without re-importing the mnemonic
It seems that these wallets are backed up by the backend
It's best not to store too much funds in such wallets to be safe
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