diff --git a/keys.proto b/keys.proto
index 50253bd..85a1f09 100644
--- a/keys.proto
+++ b/keys.proto
@@ -16,5 +16,5 @@ message Keyset {
   string unit = 2;
   string mint_url = 3;
   bool active = 4;
-  map<uint64, string> keys = 5;
+  map<uint32, string> keys = 5;
 }
diff --git a/signature.proto b/signature.proto
index ce0c300..3c9cae0 100644
--- a/signature.proto
+++ b/signature.proto
@@ -1,9 +1,10 @@
 syntax = "proto3";
 package cashu.v1;
 option go_package = "github.com/cashu/rpc/signature";
+import "tagger/tagger.proto";
 
 message BlindedSignature {
-  string id = 1;
-  uint64 amount = 2;
-  string C_ = 3;
+  string id = 1 [(tagger.tags) = "json:\"id\""];
+  uint32 amount = 2 [(tagger.tags) = "json:\"amount\""];
+  string C_ = 3[(tagger.tags) = "json:\"C_\""];
 }