I'm making a DIY hardware wallet with arduino. I'm trying to understand how to implement the BIP38 passphrase. As I understand it, it's best practice to not store this on the hardware device. In this case, how can the user sign a transaction without having to put in this additional passphrase each time? Thanks.

  • Hardware Wallets require a specialized chip called a secure cryptoprocessor that does the signing without the private key ever leaving the chip. I am not sure that an arduino fits the bill
    – Mike D
    Jun 25 at 19:47

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