anchor.diff:  %% Retrieve certificate. 
   %% Certificate will be passed to exo_json:encode() in order
   %% to be translated to JSON.
  -get_certificate_body(_CallingService, _ServiceName) ->
  +get_certificate_body(_ServiceName) ->
       {struct, 
        [
         %% Topic tree patterns that this node is authorized to
  
positive.code: %% CAlled by local exo http server
  handle_rpc("authorize_local_message", Args) ->
      {ok, ServiceName} = rvi_common:get_json_element(["service_name"], Args),
      {ok, CallingService} = rvi_common:get_json_element(["calling_service"], Args),
      authorize_local_message(ServiceName, CallingService);
  
  handle_rpc("authorize_remote_message", Args) ->
      {ok, ServiceName} = rvi_common:get_json_element(["service_name"], Args),
  
negative.code:      ]
      }.
  
  authorize_local_message(ServiceName) ->
      ?debug("authorize_rpc:authorize_local_msg(): service_name:    ~p ~n", [ServiceName]),
      {ok, 
       [ 
         { status, rvi_common:json_rpc_status(ok)},
         { signature, "fixme_add_signature" },
         { certificate, get_certificate_body(ServiceName) }
  %%       { certificate, "certificate"  }
       ]}.
  
  authorize_remote_message(ServiceName, Signature, Certificate) ->
  