diff --git a/src/secmod_denom.ml b/src/secmod_denom.ml
index 3de76e66..a1b8c921 100644
--- a/src/secmod_denom.ml
+++ b/src/secmod_denom.ml
@@ -12,6 +12,8 @@ let get_denoms t =
   Miou.Mutex.protect t.lock @@ fun () ->
   Hashtbl.to_seq_values t.denom_ht |> List.of_seq
 
+[@@@ocaml.warning "-27"]
+
 let add_master_signatures conn t l =
   Miou.Mutex.protect t.lock @@ fun () ->
   list_iter
@@ -22,6 +24,25 @@ let add_master_signatures conn t l =
           let denom = { denom with master_sig= Some master_sig } in
           let* () = Pg.add_denomination_key conn denom |> unwrap_err_caqti in
           Hashtbl.replace t.denom_ht h_denom_pub denom;
+          let* ( valid_from,
+                 expire_withdraw,
+                 expire_deposit,
+                 expire_legal,
+                 coin,
+                 fee_withdraw,
+                 fee_deposit,
+                 fee_refresh,
+                 fee_refund,
+                 age_mask ) =
+            Pg.lookup_denomination_key conn h_denom_pub
+            |> unwrap_err_caqti
+            |> Result.map Option.get
+          in
+          (*
+          assert (valid_from = denom.stamp_start);
+          assert (coin = denom.value);
+          assert (age_mask = denom.age_mask);
+          *)
           Ok ())
     l