diff --git a/src/binary_formats.ml b/src/binary_formats.ml
index 50e71f07..6a7dfdfd 100644
--- a/src/binary_formats.ml
+++ b/src/binary_formats.ml
@@ -95,6 +95,86 @@ module Blinded_coin_hash = MAKE_H (Hash_code)
 module Coin_pub_hash = MAKE_H (Hash_code)
 module Output_commitment_hash = MAKE_H (Hash_code)
 
+module Ecdh_ephemeral_public_key_p = struct
+  type t = { ecdh_pub: string (* = uint8_t ecdh_pub[32] *) }
+
+  let bin =
+    let open Bin in
+    record (fun ecdh_pub -> { ecdh_pub })
+    |+ field (bytes 32) (fun t -> t.ecdh_pub)
+    |> sealr
+end
+
+module Reserve_public_key_p = struct
+  type t = { eddsa_pub: string }
+
+  let bin =
+    let open Bin in
+    record (fun eddsa_pub -> { eddsa_pub })
+    |+ field (bytes 32) (fun t -> t.eddsa_pub)
+    |> sealr
+end
+
+module Reserve_private_key_p = struct
+  type t = { eddsa_priv: string }
+
+  let bin =
+    let open Bin in
+    record (fun eddsa_priv -> { eddsa_priv })
+    |+ field (bytes 32) (fun t -> t.eddsa_priv)
+    |> sealr
+end
+
+module Reserve_signature_p = struct
+  type t = { eddsa_signature: string }
+
+  let bin =
+    let open Bin in
+    record (fun eddsa_signature -> { eddsa_signature })
+    |+ field (bytes 64) (fun t -> t.eddsa_signature)
+    |> sealr
+end
+
+module Merchant_public_key_p = struct
+  type t = { eddsa_pub: string }
+
+  let bin =
+    let open Bin in
+    record (fun eddsa_pub -> { eddsa_pub })
+    |+ field (bytes 32) (fun t -> t.eddsa_pub)
+    |> sealr
+end
+
+module Merchant_private_key_p = struct
+  type t = { eddsa_priv: string }
+
+  let bin =
+    let open Bin in
+    record (fun eddsa_priv -> { eddsa_priv })
+    |+ field (bytes 32) (fun t -> t.eddsa_priv)
+    |> sealr
+end
+
+module Transfert_public_key_p = struct
+  type t = { ecdhe_pub: string }
+
+  let bin =
+    let open Bin in
+    record (fun ecdhe_pub -> { ecdhe_pub })
+    |+ field (bytes 32) (fun t -> t.ecdhe_pub)
+    |> sealr
+end
+
+module Transfert_private_key_p = struct
+  type t = { ecdhe_priv: string }
+
+  let bin =
+    let open Bin in
+    record (fun ecdhe_priv -> { ecdhe_priv })
+    |+ field (bytes 32) (fun t -> t.ecdhe_priv)
+    |> sealr
+end
+
 (* -- Signatures -- *)
 
 module Purpose = struct