diff --git a/src/internal_macros.rs b/src/internal_macros.rs
index 351693c..82905b1 100644
--- a/src/internal_macros.rs
+++ b/src/internal_macros.rs
@@ -77,6 +77,10 @@ macro_rules! impl_array_newtype {
             #[inline]
             /// Returns whether the object, as an array, is empty. Always false.
             pub fn is_empty(&self) -> bool { false }
+
+            #[inline]
+            /// Returns the underlying data.
+            pub fn data(&self) -> [$ty; $len] { self.0.clone() }
         }
 
         impl<'a> From<&'a [$ty]> for $thing {
diff --git a/src/util/hash.rs b/src/util/hash.rs
index 9f1d674..03b5bb8 100644
--- a/src/util/hash.rs
+++ b/src/util/hash.rs
@@ -481,6 +481,18 @@ mod tests {
                    "56944C5D3F98413EF45CF54545538103CC9F298E0575820AD3591376E2E0F65D");
     }
 
+    #[test]
+    fn test_sha256d_data() {
+        assert_eq!(
+            Sha256dHash::from_data(&[]).data(),
+            [
+                0x5d, 0xf6, 0xe0, 0xe2, 0x76, 0x13, 0x59, 0xd3, 0x0a, 0x82, 0x75, 0x05, 0x8e, 0x29,
+                0x9f, 0xcc, 0x03, 0x81, 0x53, 0x45, 0x45, 0xf5, 0x5c, 0xf4, 0x3e, 0x41, 0x98, 0x3f,
+                0x5d, 0x4c, 0x94, 0x56,
+            ]
+        );
+    }
+
     #[test]
     fn sha256d_encoder() {
         let test = vec![true, false, true, true, false];