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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
1925e8a
Merge branch 'bitcoin:master' into bip85-nostr-application-86
ethicnology Jun 29, 2026
6049828
bip85: address review on Nostr application, renumber to 128002'
ethicnology Jun 29, 2026
e6df9db
bip85: reword reserved Nostr indices to defer semantics to a future NIP
ethicnology Jun 29, 2026
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3 changes: 2 additions & 1 deletion .typos.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ extend-ignore-re = [
"prefix.*",
"value: .*",
"pqNTRUsign",
"Strnad",
"nsec1.*",
Comment thread
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]

[default.extend-words]
Expand All @@ -29,6 +29,7 @@ Atack = "Atack"
Falke = "Falke"
Meni = "Meni"
Ono = "Ono"
Strnad = "Strnad"
Toom = "Toom"

[files]
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54 changes: 50 additions & 4 deletions bip-0085.mediawiki
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@
Type: Informational
Assigned: 2020-03-20
License: BSD-2-Clause OR OPUBL-1.0
Version: 2.0.0
Version: 2.1.0
</pre>

==Abstract==
Expand Down Expand Up @@ -423,6 +423,48 @@ OUTPUT
* DERIVED ENTROPY=5e41f8f5d5d9ac09a20b8a5797a3172b28c806aead00d27e36609e2dd116a59176a738804236586f668da8a51b90c708a4226d7f92259c69f64c51124b6f6cd2
* DERIVED ROLLS=1,0,0,2,0,1,5,5,2,4

===Nostr===

Application number: 128002'

The derivation path format is: <code>m/83696968'/128002'/{identity}'/{account_index}'</code>

Each <code>identity</code> is an independent, unlinkable Nostr key namespace, and each <code>account_index</code> is a distinct key within that identity.

Identity index <code>0'</code> and account index <code>0'</code> are reserved for future key-management use, such as proof-of-linkage between an identity's keys, key rotation, and revocation. Their semantics are out of scope for this BIP and may be specified by a future NIP. Usable signing keys therefore start at <code>identity >= 1'</code> and <code>account_index >= 1'</code>.

The standard application of BIP-85 produces 64 bytes of entropy. Take the first 32 bytes (the 256 most significant bits) as the Nostr private key and discard the trailing 32 bytes, as in the HEX application. This 32-byte private key is then Bech32 encoded as an <code>nsec</code> per NIP19.

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

INPUT:
* MASTER BIP32 ROOT KEY: xprv9s21ZrQH143K2LBWUUQRFXhucrQqBpKdRRxNVq2zBqsx8HVqFk2uYo8kmbaLLHRdqtQpUm98uKfu3vca1LqdGhUtyoFnCNkfmXRyPXLjbKb
* PATH: m/83696968'/128002'/1'/1'

OUTPUT
* DERIVED ENTROPY=ff6eb0fcdf1ef87a2a06b0d7884d495b486d0faa210e9f80f23fd649d6e114d27873d12f3b57c469f684e4dc9f4abf10beeacb59b385fde8e33f1947bc5c6c17
* DERIVED NSEC=nsec1lahtplxlrmu852sxkrtcsn2ftdyx6ra2yy8flq8j8ltyn4hpznfq23uvqz

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

INPUT:
* MASTER BIP32 ROOT KEY: xprv9s21ZrQH143K2LBWUUQRFXhucrQqBpKdRRxNVq2zBqsx8HVqFk2uYo8kmbaLLHRdqtQpUm98uKfu3vca1LqdGhUtyoFnCNkfmXRyPXLjbKb
* PATH: m/83696968'/128002'/1'/2'

OUTPUT
* DERIVED ENTROPY=917628689652288f6983c8a01db516d0697d5198dcf9de9010597f5e322fba6e435a731d85fbcc5768c06ff95ff34bf577f63f415cb170473659753acf14722d
* DERIVED NSEC=nsec1j9mzs6yk2g5g76vrezspmdgk6p5h65vcmnuaayqst9l4uv30hfhqje0jyh

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

INPUT:
* MASTER BIP32 ROOT KEY: xprv9s21ZrQH143K2LBWUUQRFXhucrQqBpKdRRxNVq2zBqsx8HVqFk2uYo8kmbaLLHRdqtQpUm98uKfu3vca1LqdGhUtyoFnCNkfmXRyPXLjbKb
* PATH: m/83696968'/128002'/2'/1'

OUTPUT
* DERIVED ENTROPY=fa2e784291b1fd347ba3624672e3090cb2cee34b8567180336e3aa290d02715b8f4b18f02f07cb2aa3023afd34735282cc6594370f47e6e1fa48d8d0dda93096
* DERIVED NSEC=nsec1lgh8ss53k87ng7arvfr89ccfpjevac6ts4n3sqekuw4zjrgzw9dsq3uelh

==Backwards Compatibility==

This specification is not backwards compatible with any other existing specification.
Expand All @@ -431,16 +473,20 @@ 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==

* 1.3.0 Python 3.x library implementation: [https://github.com/akarve/bipsea]
* 1.1.0 Python 2.x library implementation: [https://github.com/ethankosakovsky/bip85]
* 1.0.0 JavaScript library implementation: [https://github.com/hoganri/bip85-js]
Comment on lines -439 to -440

@akarve akarve May 24, 2026

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No need to change this section. It's showing up as a net delete; we should leave it as is.

@murchandamus murchandamus May 26, 2026

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I think this was in reaction to my comment. See: #2126 (comment)

@akarve akarve May 26, 2026 •
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Sure but it drops two lines too many, not just the two new ones (which would show up as no diff) but two existing ones.

@murchandamus murchandamus May 27, 2026

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Right, but why are there three reference implementations in the first place? Unless they are references for different aspects of BIP85, shouldn’t there just be one?


==Changelog==

===2.1.0 (2026-05-15)===

====Added====

* Nostr application 128002'

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

====Fixed====
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