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donjoe | 3 days ago (raw) | root | parent | reply | flag 
 Has anybody explored the possibility to store an nsec inside a Passkey?

Passkeys are available on more and more operating systems, browsers, and password managers.

In certain setups this would work even across different devices.

I don't know enough about Passkeys but could imagine that they could carry additional information like an nsec.
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hodlbod | 3 days ago (raw) | root | parent | reply | flag 
 Yes, actually, I'd forgotten about it since I don't know much about passkeys either, but nprofile1qy88wumn8ghj7mn0wvhxcmmv9uq36amnwvaz7tmwdaehgu3wvf5hgcm0d9hx2u3wwdhkx6tpdshsz8thwden5te0dehhxarj9ekh2arfdeuhwctvd3jhgtnrdakj7qgnwaehxw309ac82unsd3jhqct89ejhxtcpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhsz9thwden5te0wfjkccte9ehx7um5wghxyee0qythwumn8ghj7un9d3shjtnswf5k6ctv9ehx2ap0qqs9nwtdlrvttent8w268cd6zkt4pfhd66duhwsc27htv549kgyt6kgztfpk2 made a demo a while back: https://github.com/Dolu89/nostr-passkeys-demo/tree/master
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brugeman | 1 days ago (raw) | root | parent | reply | flag +1 
 A promising thing seems to be large-blob extension https://github.com/w3c/webauthn/wiki/Explainer:-WebAuthn-Large-Blob-Extension, but I haven't been able to make demos work yet so it's probably too early and not widely supported.