I always thought an HSM verision of Amber would be a great not too intrusive or complex solution.

Params like

-Phone/client pairing secret =sign

-Only sign whitelisted Npub messages.

-Kinds[1-?] Auto sign, else return confirm message with new kind param.

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Discussion

hardware solutions could make a lot of sense for power users and organizations

for most users, i like the idea of frost with optional 2fa flow + social recovery, could implement it pretty cleanly ux wise