Abstract
With the rapid development of Bitcoin, blockchain has also received more and more attention, and consensus algorithm is the key to the development of blockchain technology, which directly affects the security, scalability, and transaction processing speed of blockchain. This paper analyzes the popular consensus algorithm and its evolution. The representative consensus algorithm is analyzed in detail. The evaluation system of consensus algorithm is given from four aspects of security, decentralization, consistency, and scalability, hoping to provide a reference for the development and innovation of consensus algorithm.
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