diff --git a/src/cmd_se_ecsign.rs b/src/cmd_se_ecsign.rs
index c21860f..52e3905 100644
--- a/src/cmd_se_ecsign.rs
+++ b/src/cmd_se_ecsign.rs
@@ -62,15 +62,15 @@ impl Command for CommandImpl {
         debugging!("Secure enclave key URI: {:?}", se_key_uri);
 
         let signature = seutil::secure_enclave_p256_sign(&se_key_uri.private_key, &message_bytes)?;
-        let signature_base64 = base64_encode(&signature);
 
         if json_output {
             let mut json = BTreeMap::<&'_ str, String>::new();
-            json.insert("signature", signature_base64);
+            json.insert("signature_base64", base64_encode(&signature));
+            json.insert("signature_hex", hex::encode(&signature));
 
             println!("{}", serde_json::to_string_pretty(&json).unwrap());
         } else {
-            success!("Signature: {}", signature_base64);
+            success!("Signature: {}", base64_encode(&signature));
         }
 
         Ok(None)