Consensus Algorithm of Proof-of-Stake Based on Credit Model

Abstract

Blockchain has attracted widespread attention from scholars due to its decentralization characteristics. Consensus algorithm is one of the core technologies of blockchain. The proposal of the Proof-of-Stake consensus algorithm solves the problem of wasted hashrate in Proof-of-Work. Aiming at the problem of interest centralization in Proof-of-Stake we propose an improved PoS scheme based on credit model. Design the credit evaluation model, using the credit evaluation mechanism to quantify the credit status of each node in the network, and adjust the hash difficulty according to the credit ranking. Introduce the concept of Gini coefficient to analyze the centralization of stake of the algorithm. Simulation experiments show that the PoS improvement scheme based on the credit model effectively relieves the power centralization, guarantees the block chain decentralization.