Research On The Improvement Of Proof Of Stake Consensus Algorithm Of Blockchain

Blockchain emerges as the underlying technology of Bitcoin and has been deeply studied in many fields in recent years.As a typical decentralized distributed data storage system,the consensus reached by all participants in a blockchain system requires a consensus Algorithm to achieve it.As one of the core technologies of the blockchain,consensus algorithm directly affects the stability,security and reliability of the blockchain system.For different business application scenarios,consensus algorithms are also put forward with different requirements.With the further development of blockchain applications,there are more studies on consensus algorithms.However,there are still some problems with existing consensus algorithms.In view of the centralization of stake existing in PoS and the unreasonable distribution of block rewards,this paper conducts related research.(1)Aiming at the centralization of stake in PoS consensus algorithm,a consensus algorithm Credit-PoS based on credit evaluation model is proposed.7indicators are selected from 3 aspects to evaluate the credit of the node,the credit of the node is scored and quantified through the model,and the hash difficulty is adjusted according to the credit of the node.The identity of the block producer is changed from the big coin age in the original algorithm to the one with high credit.By simulation experiment analysis,the improved scheme realizes the decentralization of wealth and power.On the one hand,the problem of centralization of stake is alleviated.On the other hand,the block-producing node is controlled as a non-malicious node through the credit model,thereby ensuring the security of the blockchain.(2)To solve the problem of unreasonable income distribution of PoS consensus algorithm,an incentive-based proof-of-stake consensus algorithm Incentive-PoS is proposed.By the Shapley method of game theory,the block reward of the blockchain is reasonably allocated to the nodes with good credit and the nodes that actively participate in the consensus verification.The experimental results show that the improved scheme not only distributes rewards reasonably,but also improves throughput,delay and security.On the one hand,it increases the opportunities for small nodes to gain benefits,and improves the enthusiasm of nodes to participate in consensus.On the other hand,it encourages more nodes to become honest nodes to ensure the healthy operation and development of blockchain.