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In the white book of Bitcion, Satoshi Nakamoto described a bitcoin systemthat can realize point-to-point online payment without a third-partyorganization. After supporting this magical application scenario and subvertingthe traditional centralized system, the blockchain technology has attractedworldwide attention, triggered a research upsurge of blockchain consensusalgorithm, and produced a large number of innovative applications. Althoughvarious consensus algorithms continue to evolve with the iteration ofblockchain products and applications, Proof of Work (POW) and Proof of Skake(POS) algorithms are still the core of consensus algorithms. This paperdiscusses two algorithms of POW and POS in blockchain consensus mechanism, andanalyzes the advantages and the existing problems of the two consensusmechanisms. Since consensus mechanism is the main focus of blockchaintechnology and has many influencing factors, this paper discusses the currentproblems and some improved ideas, and selects some typical algorithms for amore systematic introduction. In addition, some important issues related tosafety and performance are also discussed. This paper provides the researchersa great reference on blockchain consensus mechanism.

Analysis on Blockchain Consensus Mechanism Based on Proof of Work and Proof of Stake