diff --git a/src/keys.ml b/src/keys.ml
index 4d4eac26..e2f7dc37 100644
--- a/src/keys.ml
+++ b/src/keys.ml
@@ -92,8 +92,6 @@ module Make (Conn : Pg.CONN) (Fs : Fat.FS) : S = struct
             m "found %d active denomination(s)" (List.length l));
         l
 
-  let denominations_last_change () = Sm_rsa.last_change ()
-
   let make_future_sk (pub, (start, expire)) =
     Logs.debug (fun m -> m "make_future_sk: `%s`" (EddsaPublicKey.to_b32 pub));
     let open Time in
@@ -289,6 +287,10 @@ module Make (Conn : Pg.CONN) (Fs : Fat.FS) : S = struct
     Denomination.verify_denomination_key_validity ~key:Config.master_public_key
       dn
 
+  (* MIOU *)
+  let last_change = ref Timestamp.never
+  let denominations_last_change () = !last_change
+
   let certify_future_signkey Api.SignKeySignature.{ key= pub; master_sig } =
     match Sm_eddsa.find_key pub with
     | None -> Error "future signkey not found"
diff --git a/src/mte.ml b/src/mte.ml
index 24d704b1..0d54dbca 100644
--- a/src/mte.ml
+++ b/src/mte.ml
@@ -22,7 +22,9 @@ let hello req _server _env =
 
 (* TODO nice routes typing
    to enforce json verification
-   to specify handlers responses data and status codes *)
+   to specify handlers responses data and status codes
+
+   use Vif.Uri.conv *)
 let routes =
   let open Vifu.Uri in
   let open Vifu.Route in
diff --git a/src/secmod_eddsa.ml b/src/secmod_eddsa.ml
index 6bf84922..f542958b 100644
--- a/src/secmod_eddsa.ml
+++ b/src/secmod_eddsa.ml
@@ -7,7 +7,6 @@
    list_issue_date: save timestamp of key generation
    key validity period:
      more checks + do not exceed lookahead
-   look into ocaml-diet maybe
    refacto common parts with secmod_eddsa *)
 let src = Logs.Src.create "mte.secmod_eddsa"
 
diff --git a/src/secmod_rsa.ml b/src/secmod_rsa.ml
index 91c7fafd..bd9c71ec 100644
--- a/src/secmod_rsa.ml
+++ b/src/secmod_rsa.ml
@@ -52,7 +52,6 @@ type t = {
   sm_key_priv: EddsaPrivateKey.t;
   sm_pub: EddsaPublicKey.t;
   ht: (DenominationHash.t, key) Hashtbl.t;
-  mutable last_change: Timestamp.t;
 }
 
 let parse_filename =
@@ -206,9 +205,7 @@ let load fs =
       let sm_pub = EddsaPrivateKey.pub_of_priv sm_key_priv in
       let ht = Hashtbl.create 0xff in
       let () = List.iter (fun k -> Hashtbl.replace ht k.h_pub k) keys in
-      (* TODO list_issue_date *)
-      let last_change = Timestamp.never in
-      Ok (Some { fs; sm_key_priv; sm_pub; ht; last_change })
+      Ok (Some { fs; sm_key_priv; sm_pub; ht })
 
 let init fs =
   let* opt = load fs in
@@ -222,8 +219,7 @@ let init fs =
             m "generated secmod key: `%s`" (EddsaPublicKey.to_b32 sm_pub));
         let* () = write_eddsa fs sm_key_fpath sm_key_priv in
         let ht = Hashtbl.create 0xff in
-        let last_change = Timestamp.of_absolute now in
-        Ok { fs; sm_key_priv; sm_pub; ht; last_change }
+        Ok { fs; sm_key_priv; sm_pub; ht }
   in
   let all_keys = List.of_seq @@ Hashtbl.to_seq_values t.ht in
   let new_keys_l =
@@ -262,14 +258,11 @@ module Make (Fs : Fat.FS) = struct
     |> list_iter delete
 
   let add section_name t1 t2 =
-    let last_change = Timestamp.of_ptime (Mirage_ptime.now ()) in
     let k = gen_key ~section_name t1 t2 in
     let+ () = write_key t.fs k in
     Hashtbl.replace t.ht k.h_pub k;
-    t.last_change <- last_change;
     ()
 
-  let last_change () = t.last_change
   let sm_pub = t.sm_pub
   let sign_secmod s = EddsaSignature.sign ~key:t.sm_key_priv s