Central South University
Aiming at the trust problem in the sharing economy, the blockchain technology is used to build a shared economic blockchain network based on the PoS (Proof-of-Stake) consensus mechanism to achieve de-trust and decentralization. In PoS, the blockchain user provides transaction fees to encourage the mining pool to recruit verifiers for block propagation verification. Both the blockchain user and mining pool can benefit from more verifiers, but get the higher cost. This paper studies the conflict of interest between the blockchain user and mining pool in PoS consensus mechanism of the sharing economic blockchain network from the perspective of Nash negotiation, and weighs the transaction fee and the number of verifiers to construct the Nash negotiation game model. Then, the uniqueness of the Nash negotiation solution is proved, and the optimal decision of the blockchain user and mining pool is obtained. Finally, numerical examples are applied to analyze the impact of the communication cost and the number of verifiers on the optimal decision-making and utility of the blockchain user and mining pool. It is shown from the research results that both the blockchain user and mining pool can benefit from lower communication costs. And the Nash negotiation game model can effectively solve interest conflict between users and mining pool in the sharing economic blockchain network and improve network efficiency.