From a3370b5c9d4973c52a2b447267ec03f3ef4303c3 Mon Sep 17 00:00:00 2001
From: Anthony Towns <aj@erisian.com.au>
Date: Fri, 30 Jan 2026 16:02:05 +1000
Subject: [PATCH] BIP 324: Add auxiliary file tracking assignments of one-byte
 message type IDs

---
 bip-0324.mediawiki           |  6 ++++--
 bip-0324/message_type_ids.md | 16 ++++++++++++++++
 2 files changed, 20 insertions(+), 2 deletions(-)
 create mode 100644 bip-0324/message_type_ids.md

diff --git a/bip-0324.mediawiki b/bip-0324.mediawiki
index 4e9d26a8..e0bdd8a5 100644
--- a/bip-0324.mediawiki
+++ b/bip-0324.mediawiki
@@ -10,7 +10,7 @@
   Type: Specification
   Assigned: 2019-03-08
   License: BSD-3-Clause
-  Version: 1.0.1
+  Version: 1.0.2
   Replaces: 151
 </pre>
 
@@ -573,7 +573,7 @@ The following table lists currently defined message type IDs and the 12-byte ASC
 
 When a message type has both a 1-byte encoding and a 13-byte encoding defined, peers that support receiving that message type should accept messages using either encoding (e.g., if the "getblocktxn" message type is supported, then both the 1-byte <code>b'\x0a'</code> encoding and the 13-byte <code>b'\x00getblocktxn\x00'</code> should be supported, and behavior should not depend on which of the two encodings is received).
 
-Additional message type IDs may be added separately after BIP finalization.
+Additional message type IDs may be defined by other BIPs. They should be added to the [[bip-0324/message_type_ids.md|message type IDs table]] to ease coordination.
 
 === Signaling specification ===
 ==== Signaling v2 support ====
@@ -589,6 +589,8 @@ For development and testing purposes, we provide a collection of test vectors in
 
 == Changelog ==
 
+ * 1.0.2 (2026-01-30)
+   * Add message type ID table in auxiliary file
  * 1.0.1 (2026-01-16)
    * Specify equivalence of 1-byte and 13-byte `message_type`
  * 1.0.0 (2024-07-10)
diff --git a/bip-0324/message_type_ids.md b/bip-0324/message_type_ids.md
new file mode 100644
index 00000000..09faaae6
--- /dev/null
+++ b/bip-0324/message_type_ids.md
@@ -0,0 +1,16 @@
+
+# One-byte message type allocations
+
+This table lists additional message type IDs that various BIPs have
+assigned or proposed for assignment.
+
+Type | Message      | Proposal
+---- | ------------ | --------
+ n/a | n/a          | (none listed yet)
+
+Note that this table is not authoritative but instead is reflective
+of the BIPs proposing the changes. If multiple BIPs make conflicting
+assignments for message type IDs, that may lead to multiple entries for
+the same message type ID in this table. BIPs that are in Draft status
+may be included in the table, and as a result, the IDs and messages they
+define may be changed in future.