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Passkey PRF could also be used to backup a nostr nsec to the password manager without users needing to copy/paste private key material. And since Apple requires turning on 2FA to use passkeys, users get pretty decent security for key backups.

Apple Support

Use passkeys to sign in to websites and apps on iPhone

On iPhone, use passkeys to securely and easily sign in without passwords to websites and apps.

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I’m excited to work with Praveen of Cove Wallet on a new open standard for Bitcoin wallet cloud backup using Passkeys - no passwords, no key server trust. Today wallets like BitKey provide a seedless UX with good redundancy but they require hardware. For spending wallets or users that want to start without hardware our proposal provides a compelling UX - Just do FaceID/TouchID to sync a Passkey to your password manager and done. It’s an improvement over Photon since there is no key server to run for the wallet vendor and no PIN to remember for users (and no email/phone for PIN reset). The wallet just needs to regularly do a health check to verify the Passkey in your password manager can decrypt the cloud backup. Let us know what you think. The goal is to develop this into an open standard that any mobile signer can adopt. Link below 👇

PraveenPerera.com

A New Approach to Universal Bitcoin Wallet Backup with Passkeys and PRF • Praveen Perera's Blog

A proposal for cross-platform Bitcoin wallet backup using WebAuthn PRF, no passwords, no server trust