Research On Multi-Party Payment Of Digital Currency Based On Blockchain

Blockchain technology is an new Internet technology.As a digital currency,it realizes decentralization and completes the interaction of virtual and real value.However,the artificial restrictions result low transaction efficiency of the current network,thus bitcoin fails to meet the transaction needs of users.And the data amount of Bitcoin blockchain is increasing over time.The storage space competition in the blockchain is intensifying,and the cost of sending transactions will continue to rise.Therefore,it is necessary to improve the transaction performance of the Bitcoin blockchain and solve the issue of block capacity expansion.Payment channel allows two parties to conduct peer-to-peer transactions,are one of the mainstream technologies to improve blockchain performance.In the whole process,only establishing and closing the payment channel require interactive confirmation with the blockchain,while the transactions are placed off-chain,without need of direct transactions based on Bitcoin,thus improving the transaction performance of the blockchain.Aiming at the problem of transaction throughput in Bitcoin network,this thesis studies the multi-party payment of digital currency based on blockchain,the work completed is as follows:1)Propose a new secure large-scale multi-party payment(SLMP)protocol.The key methods is combining payment channel technology and aggregating multi-signature with public key aggregation.The payment channel in the protocol can support a large number of off-chain transactions,amortizing the transaction costs.Aggregated multi-signature based on the structure of the transaction itself,compresses the volume of the transaction data.2)Design a digital currency multi-payment scheme based on blockchain.The scheme mainly uses the blockchain technology and the payment protocol proposed in this thesis.The security of the multi-party payment scheme is based on the underlying cryptographic primitive and blockchain system,which can prevent double-spending,overspending and malicious refund.This payment scheme supports incremental payment,offline payment,and can be used in remote areas where communication infrastructure is lacking or damaged.Finally,the performance analysis of the scheme is given.3)The performance analysis of the scheme is given.The performance of the scheme is analyzed and verified from the point of view of the number of signatures by combining theory with experiment.The results show that the time efficiency of the proposed scheme is doubled compared with that of the lightning network.Compared to the Bitcoin network,the spatial efficiency of signatures is three times higher.