| Blockchain,as an emerging trusted distributed ledger technology,provides a strong guarantee for the safe storage and sharing of data.Traditional distributed ledgers store data through additional methods,and the pressure on data storage nodes will also increase.With the increase of network nodes,it is difficult to improve the transaction throughput of the system.Therefore,it is an urgent problem to improve the transaction throughput of the blockchain system and reduce the data storage pressure of the nodes.The thesis proposes a Double-Layer Blockchain Network(DLBN).In the design of DLBN,we divide the blockchain node into several storage units.The storage unit contains two types of nodes,respectively It is a consensus node and a storage node.All consensus nodes form the consensus network of the blockchain system and are responsible for block packaging and transaction verification.Other nodes in the storage unit form the storage layer of the blockchain system and are responsible for the storage of blocks.The nodes in the storage unit jointly maintain the distributed ledger.In the DLBN architecture,The thesis designs a consensus mechanism based on node agents.Through the evaluation of the nodes in the storage unit,nodes with higher reputation values are elected to undertake the consensus task.At the same time,a block storage allocation strategy is designed to ensure that the blocks can be stored reliably.Among storage nodes with high performance,we finally proposed a two-stage transaction query strategy by optimizing the internal structure of the block to improve transaction query efficiency.Through experimental verification and theoretical analysis,the double-layer blockchain network model has obvious advantages over the P2 P network architecture.Experiments show that under the premise of ensuring the stable operation of the system,the scheme in this thesis can effectively reduce node storage pressure and improve system transaction throughput. |
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