However in the Bitkey model effectively you have two hot keys (phone and key server) which is a big trade off even if it’s source viewable (it is not FOSS), and your hardware wallet has no screen so you could easily approve a transfer to an address other than you intended if someone has hijacked your phone and what appears on its screen. The Bitkey is a $150 glorified yubikey.

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This is true, which is why it makes sense at the $25 promo price. At the $150 asking price, it's a tapsigner with an added fingerprint sensor, but with additional tradeoffs and vendor lock-in. I can only see this being a useful product if they keep the current model for entry-level users and unlock it for use as a blind signer for any multisig setup. > if someone has hijacked your phone and what appears on its screen. this is common for all blind signers, not a bitkey specific issue.