diff --git a/src/api.ml b/src/api.ml
index ea904667..9a63ce8b 100644
--- a/src/api.ml
+++ b/src/api.ml
@@ -1229,10 +1229,6 @@ module ExchangeKeysResponse = struct
     hard_limits: AccountLimit.t list;
     zero_limits: ZeroLimitedOperation.t list;
     denominations: DenomGroup.t list;
-    (* Compact EdDSA signature (binary-only) over the
-       contatentation of all of the master_sigs (in reverse
-       chronological order by group) in the arrays under
-       "denominations" *)
     exchange_sig: ExchangeKeySet.t;
     exchange_pub: EddsaPublicKey.t;
     recoup: RecoupDenoms.t list;
diff --git a/src/http_info.ml b/src/http_info.ml
index 90e10dc2..f508a52f 100644
--- a/src/http_info.ml
+++ b/src/http_info.ml
@@ -68,7 +68,7 @@ let mk_keys ~db_conn (module Keys : Keys.S) ~last_issue_date =
   in
   let list_issue_date =
     match denom_l with
-    | [] -> Timestamp.never
+    | [] -> Timestamp.zero
     | dn :: _ -> dn.Denomination.stamp_start
   in
   let denom_l =