diff --git a/blockset-lib/src/sha2/hash_state.rs b/blockset-lib/src/sha2/hash_state.rs
index e7231257..553f825f 100644
--- a/blockset-lib/src/sha2/hash_state.rs
+++ b/blockset-lib/src/sha2/hash_state.rs
@@ -357,5 +357,27 @@ mod tests {
                 0xd4f8ba3_9f2bbf210_e284c3df_1af0f4a8
             ])
         );
+        // "0123456789ABCDEF0123456789ABCDEF0123456789ABCDEFabcdefghij"
+        // 87c074cbd39fe6f70f6cdee1652a0b5c87d443838c3110907c8fddb9ea45aa30
+        assert_eq!(
+            f(
+                SHA256,
+                [
+                    [
+                        0x43444546_38394142_34353637_30313233,
+                        0x43444546_38394142_34353637_30313233
+                    ],
+                    [
+                        0x43444546_38394142_34353637_30313233,
+                        0x696A0000_65666768_61626364
+                    ]
+                ],
+                464
+            ),
+            u256x::swap32([
+                0x87d4438_38c311090_7c8fddb9_ea45aa30,
+                0x87c074c_bd39fe6f7_0f6cdee1_652a0b5c
+            ])
+        );
     }
 }