Before revision:  However, even though such security concerns can be mitigated using HLF , the additional processing time spent in HLF may emerge as another issue because most IoT devices handle real-time and latency critical jobs. This problem still remains unresolved because of the absence of a HLF latency model and a parameter setup guideline to reducing the mean latency .
After revision:  However, even though such security concerns can be mitigated using HLF , the additional processing time spent in HLF may emerge as another issue because most IoT devices handle real-time and latency-critical jobs. In other words, it is necessary to estimate the HLF latency before practical deployment of BC-IoT networks. However, this problem has still remained unresolved because the distribution of the HLF latency has not been revealed until the present .