Are there differences in the hardware of other wallets like, Coldcard MK4, Blockstream Jade or SeedSigner, such that something like this wouldnt be possible on these other wallets? Which other ones can pull this same shit?
Each of those uses a different security model (CC uses a secure element, SeedSigner is stateless, etc). The main difference is that all the hardware devices that you listed are open-source or source-verifiable, while Ledger is closed source, making it impossible to audit the code.
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I see, ty, lol people were buying a closed source HWW? jeezus
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