From 7ee94bf4b02376af8b2cfc78ea954ca340fab8c5 Mon Sep 17 00:00:00 2001
From: Hodlinator <172445034+hodlinator@users.noreply.github.com>
Date: Thu, 10 Sep 2026 11:31:04 +0200
Subject: [PATCH] asmap: Make outputted ASMap version match externally computed
 hashes

* Change version from double to single SHA256
  This invalidates serialized AddrMan data which forces re-bucketing.

* Avoid reversing byte order for ASMap version in log
  Makes it easier to match it with externally computed hashes of the encoded file.
---
 src/init.cpp                     | 2 +-
 src/util/asmap.cpp               | 2 +-
 test/functional/feature_asmap.py | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/init.cpp b/src/init.cpp
index 3930e31316f..20fcf9e8afd 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -1701,7 +1701,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
                     return false;
                 #endif
             }
-            LogInfo("Using asmap version %s for IP bucketing", asmap_version.ToString());
+            LogInfo("Using asmap version %s for IP bucketing", HexStr(asmap_version));
         } else {
             node.netgroupman = std::make_unique<NetGroupManager>(NetGroupManager::NoAsmap());
             LogInfo("Using /16 prefix for IP bucketing");
diff --git a/src/util/asmap.cpp b/src/util/asmap.cpp
index 04e47c24c05..ce96613d3b3 100644
--- a/src/util/asmap.cpp
+++ b/src/util/asmap.cpp
@@ -349,5 +349,5 @@ uint256 AsmapVersion(const std::span<const std::byte> data)
 
     HashWriter asmap_hasher;
     asmap_hasher << data;
-    return asmap_hasher.GetHash();
+    return asmap_hasher.GetSHA256();
 }
diff --git a/test/functional/feature_asmap.py b/test/functional/feature_asmap.py
index 5debdfbe408..653f0caab7d 100755
--- a/test/functional/feature_asmap.py
+++ b/test/functional/feature_asmap.py
@@ -22,7 +22,7 @@ from test_framework.util import (
 )
 
 ASMAP = 'src/test/data/asmap.raw' # path to unit test skeleton asmap
-VERSION = 'bafc9da308f45179443bd1d22325400ac9104f741522d003e3fac86700f68895'
+VERSION = '55dcec00c72b8a33a271dad20271e14cfbe5526aa1dc12e2559f30c376d85a35'
 
 def expected_messages(filename):
     return [f'Opened asmap file "{filename}" (59 bytes) from disk',