service AquaDHT("test-dht"):
  put_host_value(key: string, value: string, service_id: []string) -> string

func putHostValue(key: string, value: string, service_id: ?string) -> string:
    res <- AquaDHT.put_host_value(key, value, service_id)
    <- res

func create_client_util(service_id: string) -> string:
    res <- putHostValue("client-util", service_id, nil)
    <- res