From d9266ca2e4d54b17ceabdca4ed2861d32b8b739a Mon Sep 17 00:00:00 2001
From: Wataxi <wataxiwajojo@protonmail.com>
Date: Sun, 26 Apr 2026 05:13:42 +0800
Subject: [PATCH] fix(trie): account for heap-allocated blinded hashes in
 `SparseNode::memory_size`

`Branch` was only counting `size_of::<Self>()`, missing the 512 bytes held behind `Box<[B256; 16]>`. Before: a branch reports ~80 B; after: ~592 B, matching actual allocation and keeping `ParallelSparseTrie::memory_size` from undercounting by ~5 MB per 10k branches.
---
 crates/trie/sparse/src/trie.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/crates/trie/sparse/src/trie.rs b/crates/trie/sparse/src/trie.rs
index 0fa1fd9c66e..2a65d62dec9 100644
--- a/crates/trie/sparse/src/trie.rs
+++ b/crates/trie/sparse/src/trie.rs
@@ -437,7 +437,10 @@ impl SparseNode {
     /// Returns the memory size of this node in bytes.
     pub const fn memory_size(&self) -> usize {
         match self {
-            Self::Empty | Self::Branch { .. } => core::mem::size_of::<Self>(),
+            Self::Empty => core::mem::size_of::<Self>(),
+            Self::Branch { .. } => {
+                core::mem::size_of::<Self>() + core::mem::size_of::<[B256; 16]>()
+            }
             Self::Leaf { key, .. } | Self::Extension { key, .. } => {
                 core::mem::size_of::<Self>() + key.len()
             }