Blockchain Privacy Security And On-chain And Off-chain Data Collaboration Technology

Blockchain technology has attracted more and more people’s attention and research because it can transfer value point to point reliably without establishing trust between nodes.It is considered as the core technology of information internet transformation into value Internet.Blockchain architecture achieves the purpose of data traceability and credibility by storing data on the certificate chain,and now it is gradually becoming an important scheme of data storage and sharing.In order to break through the limitations of blockchain,more and more researchers focus on the research of the scheme combined with the extension architecture under the blockchain.And this will face the security vulnerability attacks that may be brought by distributed network,which makes the security test of this on chain and off chain architecture more and more complex,and greatly increases the uncertainty risk brought by the data privacy problem.How to build a safe and controllable data collaboration technology architecture,so that the technology on and off the chain can be integrated and complementary,is the core issue of this paper.Therefore,this paper focuses on the privacy security issues in the development of blockchain Firstly,this paper proposes a new block architecture,which ensures the confirmation and docking of business logic on and off the chain.A new block structure is constructed under the architecture,which optimizes and modifies the traditional block structure,and proposes a multi authorization searchable attribute based encryption scheme.Through the design of block index,the efficient retrieval and analysis function of data on the chain is realized,and the privacy and security of user data in the process of data circulation are guaranteed.Secondly,this paper improves the practical Byzantine fault-tolerant consensus algorithm combined with the data collaboration model on the chain and off the chain,adjusts the management mode of nodes according to the clustering structure,and reduces the communication frequency of reaching consensus in the blockchain network.Compared with the practical Byzantine fault-tolerant algorithm,nodes can join or exit the network dynamically,which increases the scalability of the model.Finally,this paper verifies the scheme through the design and implementation of the prototype system under the function test of the existing alliance chain platform,and the scheme meets the privacy security and data collaboration requirements on the chain and off the chain proposed in this paper,which provides a certain reference value for the related research on the extensibility design scheme of the subsequent blockchain architecture.