update code

main.go

@@ -205,7 +205,7 @@ func proxyHandler(w http.ResponseWriter, r *http.Request) {
 							Id:      req.Id,
 							Error: map[string]interface{}{
 								"code":    -32000,
-								"message": "sender is blacklisted",
+								"message": "sender is invalid",
 							},
 						}
 						w.Header().Set("Content-Type", "application/json")