+ drain

tools/offline_impl.ml

@@ -411,6 +411,11 @@ let disable_wire ~output ~master_key ~payto_uri =
 let drain ~output ~master_key ~debit_account_section ~credit_payto_uri ~wtid
     ~date ~amount =
   let* key = read_master_key_file master_key in
+  let* () =
+    match String.length wtid = 32 with
+    | false -> Error "invalid wtid: must be 32 bytes"
+    | true -> Ok ()
+  in
   let master_sig =
     let open Signatures.MasterDrainProfit in
     signf (EddsaSignature.sign ~key)