Abstract
The permissioned blockchain has attracted the attention of multiple industries like the supply chain due to its decentralization and data tamper resistance. In these industries applications, the permissioned blockchain maintained by multiple participants often has a large number of nodes. The PBFT consensus is commonly used in the permissioned blockchain, but it requires a large amount of message transmission to reach consensus, resulting in poor scalability. In this paper, we propose DP-Hybrid, a novel two-layer consensus protocol, to reduce the communication costs and improve scalability. Specifically, nodes use PBFT to establish K autonomous systems at the bottom layer, and then participate at the top layer with Constrained PoW consensus protocol. DP-Hybrid reduces the communication costs from PBFT’s \(O(N^2)\) to \(O(N^2/K^2)\). The experiment results show that DP-Hybrid’s throughput is always about 10 times that of PBFT when the number of nodes increases.
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Acknowledgments
This work was supported in part by the National Natural Science Foundation of China (No. 61972161 and No. 61902333), and in part by the Fundamental Research Funds for the Central Universities, China (No. 2018MS53).
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Wen, F., Yang, L., Cai, W., Zhou, P. (2020). DP-Hybrid: A Two-Layer Consensus Protocol for High Scalability in Permissioned Blockchain. In: Zheng, Z., Dai, HN., Fu, X., Chen, B. (eds) Blockchain and Trustworthy Systems. BlockSys 2020. Communications in Computer and Information Science, vol 1267. Springer, Singapore. https://doi.org/10.1007/978-981-15-9213-3_5
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DOI: https://doi.org/10.1007/978-981-15-9213-3_5
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