【Author】
Wang, Yong; Zhong, Meiling; Cheng, Tong
【Source】SCIENTIFIC REPORTS
【Abstract】The consensus mechanism is the core of the blockchain system, which plays an important role in the performance and security of the blockchain system . The Practical Byzantine Fault Tolerance (PBFT) algorithm is a widely used consensus algorithm, but the PBFT algorithm also suffers from high consensus latency, low throughput and performance. In this paper, we propose a grouped PBFT consensus algorithm (GPBFT) based on feature trust. First, the algorithm evaluates the trust degree of nodes in the transaction process through the EigenTrust trust model, and uses the trust degree of nodes as the basis for electing master nodes and proxy nodes. Then, the algorithm divides the nodes in the blockchain system into multiple groups, and the consensus within each independent group does not affect the other groups, which greatly reduces the communication overhead of the consensus process when the number of nodes in the system is large. Finally, we demonstrate through theoretical and experimental analysis that the GPBFT algorithm has a significant improvement in security and performance.
【摘要】共识机制是区块链系统的核心，对区块链系统的性能和安全性起着重要的作用。实用的拜占庭容错(PBFT)算法是一种广泛使用的一致性算法，但PBFT算法也存在一致性延迟高、吞吐量和性能低的问题。本文提出了一种基于特征信任的分组PBFT共识算法。该算法首先通过EigenTrust信任模型评估节点在交易过程中的信任度，并将节点的信任度作为选举主节点和代理节点的依据。然后，该算法将区块链系统中的节点分成多个组，每个独立组内的共识不影响其他组，大大降低了系统中节点数量较大时共识过程的通信开销。最后，通过理论和实验分析，证明了GPBFT算法在安全性和性能上有显著的提高。
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