diff --git a/src/keys.ml b/src/keys.ml
index cd5d3517..d6a93db2 100644
--- a/src/keys.ml
+++ b/src/keys.ml
@@ -179,7 +179,7 @@ module Make (Conn : Pg.CONN) = struct
   let find_denom h_pub = Pg.find_denom conn h_pub |> unwrap_err_caqti
 
   (* TODO check stamps definitions *)
-  let mk_future_sk pub start expire =
+  let make_future_sk ~pub ~start ~expire =
     let stamp_start = Timestamp.of_absolute start in
     let stamp_expire = Timestamp.of_absolute expire in
     let stamp_end = stamp_expire in
@@ -194,13 +194,13 @@ module Make (Conn : Pg.CONN) = struct
     Api.FutureSignKey.
       { key= pub; stamp_start; stamp_expire; stamp_end; signkey_secmod_sig }
 
-  let _get_future_sk () =
+  let _get_future_signkeys () =
     Secmod_eddsa.keys ()
     |> List.map (fun (pub, t1, t2) ->
         let* opt = find_signkey pub in
         match opt with
         | None ->
-            let future_sk = mk_future_sk pub t1 t2 in
+            let future_sk = make_future_sk ~pub ~start:t1 ~expire:t2 in
             Ok (Some future_sk)
         | Some sk -> (
             match Timestamp.of_absolute t1 = sk.stamp_start with
@@ -210,7 +210,24 @@ module Make (Conn : Pg.CONN) = struct
                   (EddsaPublicKey.to_b32 pub)
             | true -> Ok None))
 
-  let make_future_dn t ~section_name ~pub start _end_ =
+  let make_future_dn ~coin ~pub ~start =
+    let Config.Coin.
+          {
+            section_name;
+            value;
+            duration_withdraw;
+            duration_spend;
+            duration_legal;
+            fee_withdraw;
+            fee_deposit;
+            fee_refresh;
+            fee_refund;
+            cipher= _;
+            rsa_keysize= _;
+            age_restricted= _;
+          } =
+      coin
+    in
     let stamp_start = Timestamp.of_absolute start in
     let stamp_expire_withdraw =
       Timestamp.of_absolute @@ Time.Absolute.add start duration_withdraw
@@ -221,7 +238,6 @@ module Make (Conn : Pg.CONN) = struct
     let stamp_expire_legal =
       Timestamp.of_absolute @@ Time.Absolute.add start duration_legal
     in
-    let priv, pub = RsaPrivateKey.generate ~bits:rsa_keysize () in
     let open Api in
     let rsa_denomination_key =
       RsaDenominationKey.{ age_mask= 0; rsa_pub= pub }
@@ -255,14 +271,24 @@ module Make (Conn : Pg.CONN) = struct
         denom_secmod_sig;
       }
 
-  let _get_future_dn () =
+  let _get_future_denominations () =
     Secmod_rsa.keys ()
-    |> List.map (fun (section_name, pub, t1, t2) ->
+    |> List.map (fun (section_name, pub, t1, _t2) ->
         let h_pub = DenominationHash.hash (RsaPublicKey.to_octets pub) in
+        (*?? let duration_withdraw = Time.Absolute.diff t1 t2 in*)
         let* opt = find_denom h_pub in
         match opt with
         | None ->
-            let future_dn = mk_future_dn ~section_name ~h_pub ~pub t1 t2 in
+            let* coin =
+              Config.Coin.all_coins
+              |> List.find_opt (fun coin ->
+                  coin.Config.Coin.section_name = section_name)
+              |> function
+              | Some v -> Ok v
+              | None ->
+                  Fmt.error "coin `%s` not found in configuration" section_name
+            in
+            let future_dn = make_future_dn ~coin ~pub ~start:t1 in
             Ok (Some future_dn)
         | Some sk -> (
             match Timestamp.of_absolute t1 = sk.stamp_start with