Abstract: The characteristics of blockchain,such as decentralization,anonymity and tampering,have made it exert profound influence on finance and other fields.However,at present,there are still many problems in the block chain system,such as low computing efficiency,limited capacity per unit time,and compatibility and interoperability between different block systems.In view of the above three problems,an efficient blockchain consensus and exchange system was proposed.Under the premise of ensuring the openness,security and tamper ability of the blockchain system and other blockchain features,the system realizes the rapid confirmation of the blockchain network for transactions issued by users,and effectively prevents the problem of excessive single-time synchronous block data in the same blockchain network.The system divide the nodes in the block chain into three types:consensus service nodes,cross-chain switching nodes and application nodes.The consensus service nodes with high computing power are connected together through high-speed network to form a blockchain P2P network serving a certain business field,and provide consensus computing services for application nodes in the blockchain network.Cross-chain switching nodes are connected to different blockchain networks at the same time,and a blockchain switching network is formed between switching nodes based on P2P protocol,providing cross-chain access services for application nodes of different blockchain networks.Application nodes could synchronize data from their respective blockchain network consensus service nodes,access cross-chain switching nodes,and send in-chain or cross-chain transactions.The experimental results show that the blockchain service network built by this system can greatly improve the consensus computing efficiency and increase the volume of transactions per unit time.

Key words: Blockchain, Common computing efficiency, Cross-chain exchange, Smart contract, Volume of transaction