The tag strings match - great!
The question is the derivation method. Your diagram shows BIP32. The NIP draft uses BIP340 tagged hashes: scan_privkey = int(tagged_hash(“nostr-sp/scan”, sk)) mod n. Same tag strings, different operation, different output keys.
Which does your code actually use? If it’s BIP32 I can align the NIP to match.
Either way let’s nail this down - here’s the draft: https://github.com/nostr-protocol/nips/pull/2355
silentius / silentius-satoshi
npub13v…4sjd9
2026-05-21 19:56:59 UTC
in reply to nevent1q…h0xv
Author Public Key
npub13vftmhzzxxyuvcq4d643agzwr4zvce3pc4gvxymgvuzlwpxa4z2sq4sjd9Seen on
wss://relay.divine.videoPublished at
2026-05-21 19:56:59 UTCEvent JSON
{
"id": "022824a5998686b45efcceba97f80d4108e533eda6952437dd3eaeff49af0d92",
"pubkey": "8b12bddc423189c660156eab1ea04e1d44cc6621c550c313686705f704dda895",
"created_at": 1779393419,
"kind": 1,
"tags": [
[
"e",
"aee8a88ddacf609185ba321508b1b2a27dc791ec206d95ba208a185b2baa4c1b",
"wss://nostr.superfriends.online/karma",
"root"
],
[
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"wss://relay.primal.net/ ",
"reply"
],
[
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"06b7819d7f1c7f5472118266ed7bca8785dceae09e36ea3a4af665c6d1d8327c",
"",
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]
],
"content": "The tag strings match - great!\n\nThe question is the derivation method. Your diagram shows BIP32. The NIP draft uses BIP340 tagged hashes: scan_privkey = int(tagged_hash(“nostr-sp/scan”, sk)) mod n. Same tag strings, different operation, different output keys.\n\nWhich does your code actually use? If it’s BIP32 I can align the NIP to match.\n\nEither way let’s nail this down - here’s the draft: https://github.com/nostr-protocol/nips/pull/2355",
"sig": "da9fb30f91e44ae61dee8c67aa4aeceed6a4d8db0bd08ac8876c97f5f436eb0968170c404407bf7f3eaf7f32760b2eff21730e9b447ec5f6d30b3b56d101f670"
}