Why not make a "bitkey" using a Coldcard HSM, Software key on Nunchuk, and a Tapsigner? Literally the same thing except YOU CAN BACKUP THE KEYS.

(Also if we could get that HSM code maintained that would be great).

Hell, Coinkite could even make a bundle with setup instructions. 🤔

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We will not have apps or servers with customer information.

No, I meant an HSM that the customer runs themselves with a Coldcard mk4.

(Not the trusted service Bitkey has) A real self-custodial version of the same UX.