diff --git a/src/signature.rs b/src/signature.rs
index 230fce9..c739863 100644
--- a/src/signature.rs
+++ b/src/signature.rs
@@ -64,7 +64,7 @@ impl AnkHash {
     }
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
 pub struct Proof {
     signature: Signature,
     message: [u8; 32],