diff --git a/tduck-api/src/main/java/com/tduck/cloud/api/util/SignUtils.java b/tduck-api/src/main/java/com/tduck/cloud/api/util/SignUtils.java
index 79d89ac..db795bd 100644
--- a/tduck-api/src/main/java/com/tduck/cloud/api/util/SignUtils.java
+++ b/tduck-api/src/main/java/com/tduck/cloud/api/util/SignUtils.java
@@ -33,6 +33,7 @@ public class SignUtils {
             return false;
         }
         String paramsSign = getParamsSign(params, secret);
+        log.debug("sign1 {} sign2 {}", paramsSign, urlSign);
         return StringUtils.isNotBlank(paramsSign) && urlSign.equals(paramsSign);
     }