diff --git a/Hcs.Broker/Api/Request/GostSigningMessageInspector.cs b/Hcs.Broker/Api/Request/GostSigningMessageInspector.cs
index 8a64c24..2db1f26 100644
--- a/Hcs.Broker/Api/Request/GostSigningMessageInspector.cs
+++ b/Hcs.Broker/Api/Request/GostSigningMessageInspector.cs
@@ -125,7 +125,7 @@ namespace Hcs.Broker.Api.Request
 
             var reference = new CpReference()
             {
-                Uri = "",
+                Uri = "#signed-data-container",
                 DigestMethod = digestMethod
             };