passkey, you send in a userHandle, string, anything which is associated by the passkey storage with the passkey id

so in sys you just need to store the passkey id against the user id

you dont need to send userhandle though, can be private, cleaner if you jist assoc in data yourself passkey to nostr id 

 What I am asking is where does the nsec fit into the picture? Just using npub as user handle?