@freemo At this point I feel like one you don't build yourself is likely to be a scam.
non-wireless PCBs capable of running Linux are pretty cheap anyway.
@swiley That wouldnt exactly be a hardware wallet if you just threw a wallet on a linux device. Hardware wallets would need special security chips that ensure your private key can never be retrieved. Building one yourself is doable
@freemo Aren't those "security chips" just CPUs that sign things and don't let you import/export the keys?
The only difference here is how big the hardware holding the keys is.
@swiley they usually let you import keys into the chip but no way to get them out of the chip.
So you need more than a SoC where all you'd have to do is update the OS and you could get the key out.
@freemo Most modern SoCs let you burn a hash of the second stage bootloader into OTP on chip memory. You can use that to prevent OS updates.
@swiley There are all sorts of potential attacks I wouldnt want to mitigate with my own. I'd much rather use something that has been tested by a large number of people using known approaches. Not that I trust it either, the NSA probably have some backdoors in a lot of shit. But I'd trust it more than something I just whipped up where I am the only consumer.