关键词: 区块链, 性能, 安全性, 每秒交易处理量

Abstract: The Blockchain has been applied to a variety of sectors with great prospects. The main technological challenge the Blockchain facing is its performance bottleneck. The paper constructs a model to fit the Blockchain performance, analyzes the quantitative relationship between block creation rate, block size, network propagation speed and Blockchain performance, the security of the system. Increasing the block’s size or the block creation rate are equivalent in increasing the Blockchain’s performance through the quantitative analysis, but the increment shows marginal decline. And the network propagation speed restricts the improvement effect the block size or block creation rate has on the Blockchain performance and the security of the system. When their increments match the network propagation speed, the best improvement effect occurs. The mathematical model not only provides the theoretic support for the customization of the Blockchain system but also helps us understand the performance bottleneck of Blockchain which can offer the theoretic guidance to the development of efficient Blockchain technology.

Key words: Blockchain, performance, security, Transactions Per Second（TPS）