diff --git a/src/contract/assignments.rs b/src/contract/assignments.rs
index 8d66b25a..edc293a5 100644
--- a/src/contract/assignments.rs
+++ b/src/contract/assignments.rs
@@ -50,7 +50,7 @@ impl KnownState for RevealedValue {}
 impl KnownState for RevealedData {}
 impl KnownState for RevealedAttach {}
 
-#[derive(Copy, Clone, Eq, Debug)]
+#[derive(Copy, Clone, Eq, Hash, Debug)]
 #[derive(StrictType, StrictDumb, StrictEncode, StrictDecode)]
 #[strict_type(lib = LIB_NAME_RGB_STD)]
 #[cfg_attr(