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BIP85: add Nostr application #2126

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d3512bd
feat(BIP-85): add Nostr application 86'
ethicnology Mar 20, 2026
371277d
fix: exclude nsec from typos
ethicnology Mar 20, 2026
1ce5ca8
Merge branch 'bitcoin:master' into bip85-nostr-application-86
ethicnology Mar 26, 2026
cdf115e
BIP-85: use bold text for Nostr test vector labels to reduce TOC entries
ethicnology Mar 26, 2026
819db6a
refactor: according to @jonatack review
ethicnology May 6, 2026
c1ba10e
Merge branch 'master' into bip85-nostr-application-86
ethicnology May 6, 2026
1e8baf0
Merge branch 'bitcoin:master' into bip85-nostr-application-86
ethicnology May 14, 2026
13f307b
BIP-86: rename Nostr application 86' to 9000', bump to 2.1.0, list ru…
ethicnology May 14, 2026
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1 change: 1 addition & 0 deletions .typos.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ extend-ignore-re = [
"value: .*",
"pqNTRUsign",
"Strnad",
"nsec1.*",
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]

[default.extend-words]
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54 changes: 53 additions & 1 deletion bip-0085.mediawiki
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Expand Up @@ -423,6 +423,52 @@ OUTPUT
* DERIVED ENTROPY=5e41f8f5d5d9ac09a20b8a5797a3172b28c806aead00d27e36609e2dd116a59176a738804236586f668da8a51b90c708a4226d7f92259c69f64c51124b6f6cd2
* DERIVED ROLLS=1,0,0,2,0,1,5,5,2,4

===Nostr===

Application number: 86'

The application number is the sum of the alphabetical positions of the letters in Nostr (n=14 + o=15 + s=19 + t=20 + r=18) to avoid the confusion with NIP06.

The derivation path format is: <code>m/83696968'/86'/{identity}'/{account}'</code>
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Uses the entropy as a Nostr private key.

Identity index <code>0'</code> is reserved for future protocol use.
Account index <code>0'</code> is reserved across all identities for key management operations.
Usable keys start at <code>identity >= 1'</code> and <code>account >= 1'</code>.

The resulting 32-byte private key is Bech32 encoded as an <code>nsec</code> per NIP19.

'''identity=1, account=1'''

INPUT:
* MASTER BIP32 ROOT KEY: xprv9s21ZrQH143K2LBWUUQRFXhucrQqBpKdRRxNVq2zBqsx8HVqFk2uYo8kmbaLLHRdqtQpUm98uKfu3vca1LqdGhUtyoFnCNkfmXRyPXLjbKb
* PATH: m/83696968'/86'/1'/1'

OUTPUT
* DERIVED ENTROPY=7f3313b1bdeacc4f395c666b473982550cdc66c225fd7e7b0f5d11d33cddde31
* DERIVED NSEC=nsec10ue38vdaatxy7w2uve45wwvz25xdcekzyh7hu7c0t5gax0xamccsyuyesn

'''identity=1, account=2'''

INPUT:
* MASTER BIP32 ROOT KEY: xprv9s21ZrQH143K2LBWUUQRFXhucrQqBpKdRRxNVq2zBqsx8HVqFk2uYo8kmbaLLHRdqtQpUm98uKfu3vca1LqdGhUtyoFnCNkfmXRyPXLjbKb
* PATH: m/83696968'/86'/1'/2'

OUTPUT
* DERIVED ENTROPY=41fbfba9227f7d261ccb90f61264fd0b38e1f762108c31135f8fc138329594ff
* DERIVED NSEC=nsec1g8alh2fz0a7jv8xtjrmpye8apvuwramzzzxrzy6l3lqnsv54jnlsuxjsql

'''identity=2, account=1'''

INPUT:
* MASTER BIP32 ROOT KEY: xprv9s21ZrQH143K2LBWUUQRFXhucrQqBpKdRRxNVq2zBqsx8HVqFk2uYo8kmbaLLHRdqtQpUm98uKfu3vca1LqdGhUtyoFnCNkfmXRyPXLjbKb
* PATH: m/83696968'/86'/2'/1'

OUTPUT
* DERIVED ENTROPY=a159a41860a18457855511334a3c813430468ec3c1ef17700d4917d0e881a45a
* DERIVED NSEC=nsec159v6gxrq5xz90p24zye550ypxscydrkrc8h3wuqdfytap6yp53dq5gdpd6

==Backwards Compatibility==

This specification is not backwards compatible with any other existing specification.
Expand All @@ -431,7 +477,7 @@ This specification relies on BIP32 but is agnostic to how the BIP32 root key is

==References==

BIP32, BIP39
BIP32, BIP39, [https://github.com/nostr-protocol/nips/blob/master/01.md NIP01], [https://github.com/nostr-protocol/nips/blob/master/06.md NIP06], [https://github.com/nostr-protocol/nips/blob/master/19.md NIP19]

==Reference Implementations==

Expand All @@ -441,6 +487,12 @@ BIP32, BIP39

==Changelog==

===2.1.0===
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====Added====

* Nostr application 86'
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@akarve akarve May 3, 2026

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How about 7879838482 per earlier discussion?

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@ethicnology ethicnology May 4, 2026

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Isn't it a too big number ?

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@jonatack jonatack May 6, 2026

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Looks like this is the remaining point to resolve?

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@ethicnology ethicnology May 6, 2026 •
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Yes, it is.
86 is too small, but 7879838482 exceeds 2³¹. I want to make sure that won't cause issues.

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@akarve akarve May 6, 2026

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Isn't it a too big number ?

Good catch. No reason to break integer bounds. Can we try the Hebrew “NSTR”?

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@ethicnology ethicnology May 10, 2026

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To avoid removing a char, we could try, the ASCII sum of "nostr" (110+111+115+116+114) –> 566

But then I don't know if it is still too small

If so I could try a date


===2.0.0 (2025-09-19)===

====Fixed====
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