Maybe passkeys to a relay window that stores your keys in an encrypted OPFS (Origin private file system) vault with a mix of a pin and FIDO2 HMAC secret ("hmac-secret" extension)
https://docs.yubico.com/yesdk/users-manual/application-fido2/hmac-secret.html
https://fidoalliance.org/specs/fido-v2.1-ps-20210615/fido-client-to-authenticator-protocol-v2.1-ps-20210615.html#sctn-hmac-secret-extension
https://levischuck.com/blog/2023-02-prf-webauthn
https://developer.mozilla.org/en-US/docs/Web/API/File_System_API/Origin_private_file_system
I have an old Solid demo with a relay window login
https://ldux-meme-scratchboard.netlify.app/
mfoster.io / mfostr
npub1ma…6p9v4
2025-02-19 11:57:26
in reply to nevent1q…xvdd
Author Public Key
npub1maee5ny3mc52km3sl405e2d08aupvml9fqe2dwq60qktlsyfpshse6p9v4Seen on
wss://relay.primal.netPublished at
2025-02-19 11:57:26Event JSON
{
"id": "f4e19ce09030e2c56002881fb41d4a551354515f67d6f48b9b5e561828663755",
"pubkey": "df739a4c91de28ab6e30fd5f4ca9af3f78166fe54832a6b81a782cbfc0890c2f",
"created_at": 1739966246,
"kind": 1,
"tags": [
[
"e",
"7dcfe0a7d06c6738af3dd882c23751c20371af9c5fe99b0d768f5d747eaa094f",
"wss://nostr.oxtr.dev",
"root"
],
[
"p",
"6e468422dfb74a5738702a8823b9b28168abab8655faacb6853cd0ee15deee93"
]
],
"content": "Maybe passkeys to a relay window that stores your keys in an encrypted OPFS (Origin private file system) vault with a mix of a pin and FIDO2 HMAC secret (\"hmac-secret\" extension)\n\nhttps://docs.yubico.com/yesdk/users-manual/application-fido2/hmac-secret.html\n\nhttps://fidoalliance.org/specs/fido-v2.1-ps-20210615/fido-client-to-authenticator-protocol-v2.1-ps-20210615.html#sctn-hmac-secret-extension\n\nhttps://levischuck.com/blog/2023-02-prf-webauthn\n\nhttps://developer.mozilla.org/en-US/docs/Web/API/File_System_API/Origin_private_file_system\n\nI have an old Solid demo with a relay window login\n\nhttps://ldux-meme-scratchboard.netlify.app/\n",
"sig": "d928df0ed8128c0f3380f88f1071db26767900c9ec31858a8033bb78c0e62e025cc0da5df05bc59a09ace8019573abbca28ece086c2e349e7e2ba8757b6d1c35"
}