DQN-Based Optimization Framework for Secure Sharded Blockchain Systems

Jusik Yun, Yunyeong Goh, Jong Moon Chung

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


High levels of scalability and reliability are needed to support the massive Internet-of-Things (IoT) services. In particular, blockchains can be effectively used to safely manage data from large-scale IoT networks. However, current blockchain systems have low transactions per second (TPS) rates and scalability limitations that make them unsuitable. To solve the above issues, this article proposes a deep Q network shard-based blockchain (DQNSB) scheme that dynamically finds the optimal throughput configuration. In this article, a novel analysis of sharded blockchain latency and security-level characterization is provided. Using the analysis equations, the DQNSB scheme estimates the level of maliciousness and adapts the blockchain parameters to enhance the security level considering the amount of malicious attacks on the consensus process. To achieve this purpose, deep reinforcement learning (DRL) agents are trained to find the optimal system parameters in response to the network status, and adaptively optimizes the system throughput and security level. The simulation results show that the proposed DQNSB scheme provides a much higher TPS than the existing DRL-enabled blockchain technology while maintaining a high security level.

Original languageEnglish
Article number9133069
Pages (from-to)708-722
Number of pages15
JournalIEEE Internet of Things Journal
Issue number2
Publication statusPublished - 2021 Jan 15

Bibliographical note

Funding Information:
Manuscript received March 27, 2020; revised May 29, 2020; accepted June 30, 2020. Date of publication July 3, 2020; date of current version January 7, 2021. This work was supported by the Ministry of Science and ICT (MSIT), South Korea, through the Information Technology Research Center Support Program supervised by the Institute for Information and communications Technology Planning and Evaluation (IITP) under Grant IITP-2020-2018-0-01799. (Corresponding author: Jong-Moon Chung.) The authors are with the School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, South Korea (e-mail: awp212@yonsei.ac.kr; rhdbsdud@yonsei.ac.kr; jmc@yonsei.ac.kr). Digital Object Identifier 10.1109/JIOT.2020.3006896

Publisher Copyright:
© 2014 IEEE.

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Information Systems
  • Hardware and Architecture
  • Computer Science Applications
  • Computer Networks and Communications


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