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PRF(passkey,'NOSTR-SALT') → BIP32 → nsec PRF(passkey,'WALLET-SALT') → BIP39 → Lightning wallet Client-side. We never see the output. Same result on any device with the same passkey.
https://github.com/Salmatcre8/zappr
#nostr #bitcoin #webauthn #buildingpublic
9/8/2026, 2 engagements
For anyone who's shipped a Next.js PWA with WebAuthn, how did you handle the RP ID when moving from a Vercel preview URL to a custom domain?
We have issue #12 open on this: a passkey enrolled on the preview domain returns "no passkey available" when tried on the custom domain expected, different origin but there's a fixable part on our end we're still working through.
https://github.com/Salmatcre8/zappr
#nostr #webauthn #bitcoin #opensource
8/7/2026, 2 engagements