diff --git a/src/keys.ml b/src/keys.ml
index d6a93db2..793e18c4 100644
--- a/src/keys.ml
+++ b/src/keys.ml
@@ -1,5 +1,3 @@
-module type S = Keys_intf.S
-
 module Make (Conn : Pg.CONN) = struct
   open Syntax
   open Crypto
diff --git a/src/keys.mli b/src/keys.mli
deleted file mode 100644
index 50b891d4..00000000
--- a/src/keys.mli
+++ /dev/null
@@ -1,3 +0,0 @@
-module type S = Keys_intf.S
-
-module Make (_ : Pg.CONN) : S
diff --git a/src/keys_intf.ml b/src/keys_intf.ml
deleted file mode 100644
index 48e39dad..00000000
--- a/src/keys_intf.ml
+++ /dev/null
@@ -1,43 +0,0 @@
-module type S = sig
-  open Crypto
-
-  val sm_pubkey : eddsa_pub
-  val sign_with_sm_key : string -> eddsa_sig
-  val sign_with_signkey : pub:eddsa_pub -> string -> eddsa_sig
-  val verify_with_master_key : eddsa_sig -> msg:string -> (unit, string) result
-  val verify_with_sm_key : eddsa_sig -> msg:string -> (unit, string) result
-
-  val verify_with_signkey :
-    pub:eddsa_pub -> eddsa_sig -> msg:string -> (unit, string) result
-
-  val get_signkeys : unit -> Signkey.t list
-  val get_denominations : unit -> Denomination.t list
-  val get_future_signkeys : unit -> Api.FutureSignKey.t list
-  val get_future_denominations : unit -> Api.FutureDenom.t list
-  val find_signkey : eddsa_pub -> Signkey.t option
-  val find_denomination : denom_hash -> Denomination.t option
-  val find_future_signkey : eddsa_pub -> Api.FutureSignKey.t option
-  val find_future_denomination : denom_hash -> Api.FutureDenom.t option
-
-  val certify_future_signkey :
-    eddsa_pub ->
-    master_sig:Signatures.ExchangeSigningKeyValidity.t ->
-    (unit, string) result
-
-  val certify_future_denomination :
-    denom_hash ->
-    master_sig:Signatures.DenominationKeyValidity.t ->
-    (unit, string) result
-
-  val revoke_signkey :
-    eddsa_pub ->
-    Signatures.MasterSigningKeyRevocation.t ->
-    (unit, string) result
-
-  val revoke_denomination :
-    denom_hash ->
-    Signatures.MasterDenominationKeyRevocation.t ->
-    (unit, string) result
-
-  val save : unit -> (unit, string) result
-end