Hierarchical Consensus Optimization of Blockchain Based on Trust Delegation

• Published in: Jisuanji gongcheng
• Main Author: DUAN Jing, Lü Xin, LIU Fan
• Format: Article
• Language: English
• Published: Editorial Office of Computer Engineering 2020-10-01
• Subjects: blockchain|consensus protocol|practical byzantine fault tolerance(pbft) mechanism|hierarchical consensus|consortium chain
• Online Access: https://www.ecice06.com/fileup/1000-3428/PDF/20201015.pdf

Consortium chain is currently the preferredblockchain solution for governments and enterprises to build industry applications,but its core consensus mechanism,Practically Byzantine Fault Tolerance(PBFT),has scalability problems.Using the sharding technology and agent node can effectively reduce the complexity of consensus messages,and relevant researches focus on the agent’s mechanisms of the election mode,improvement and intervention protocol process.Therefore,this paper proposes a hierarchical consensus optimization mechanism,TDH-PBFT,based on trust delegation.The mechanism divides the consensus nodes into independent groups,and the behaviors of the consensus process among the nodes within the group are evaluated to obtain the trust degree of nodes.Based on the trust degree,the entrusted agent is elected to participate in the local and global consensus.The completeness of TDH-PBFT is proved theoretically.Experimental results show that when the number of nodes increases,the proposed algorithm can effectively reduce consensus time,increase system throughput,and ensure consensus service quality.