diff --git a/src/uint256.h b/src/uint256.h
index abd0b71e6..eb0066fa2 100644
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -344,7 +344,17 @@ public:
         return (unsigned char*)&pn[WIDTH];
     }
 
-    unsigned int size()
+    const unsigned char* begin() const
+    {
+        return (unsigned char*)&pn[0];
+    }
+
+    const unsigned char* end() const
+    {
+        return (unsigned char*)&pn[WIDTH];
+    }
+
+    unsigned int size() const
     {
         return sizeof(pn);
     }