From 1d4977b12c969e44fce5ef231ebb3625a55fdde2 Mon Sep 17 00:00:00 2001
From: Vlad Stan <stan.v.vlad@gmail.com>
Date: Fri, 7 Apr 2023 17:31:00 +0300
Subject: [PATCH] doc: add BIP32

---
 704.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/704.md b/704.md
index 032fff9..ecb9403 100644
--- a/704.md
+++ b/704.md
@@ -17,3 +17,10 @@ This means that each participant has to:
  - build a `direct message top key` from which it will derive keys to send `kind:4` events and keys where to recieve (listen for) `kind:4` events
  - share this `direct message top key` with its DM peer
 
+Each client has a `master` key (denoted with `m`). This key can be the profile `nsec...`, but it is not mandatory.
+
+## BIP32 purpose
+[https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki](BIP32) is used to derive the paths.
+
+This NIP defines purpose `25709` (`dm` -> `0x646d` -> `25709`) for deriving `Direct Messages` related keys.
+`m/25709'/1237'/[<account>']`
\ No newline at end of file