Content Storage Technology Of Digital Copyright Work Based On Blockchain

Blockchain technology has the characteristics of decentralization,data multi-node consensus,data traceability and tampering difficult,and has a good advantage in digital rights management.However,the blockchain system uses multiple copies of redundant storage,each consensus node needs to store the entire blockchain,the storage burden of each node is large,and the storage scalability of the blockchain system is poor.Moreover,the existing blockchain system has an application layer that design suitable for recording financial transaction information of small size,and when the copyright management system stores the copyrighted content of a larger size,it will bring a very large overhead.Therefore,in order to improve the information storage capability of the blockchain system,and make the blockchain technology better applied to the field of digital copyright management.This thesis studies the Hyperledger Fabric blockchain system with low node dynamics,and its block file storage system and chaincode proposal were improved.The main tasks as follows:(1)Design a blockchain storage expansion scheme based on the erasure code(EC).The RS erasure code is used to improve the storage system of hyperledger fabric,and the block files are encoded into segments and distributed,which reduces the data redundancy of the system while satisfying the requirements of the copyright management system.In order to avoid duplicate coding segments between organizations and to equalize the coding overhead of each organization member,a code segmentation preservation algorithm is proposed.In order to meet the synchronization requirements of offline nodes for the block files stored in the encoded segmentation,an improved hyperledger fabric block synchronization process is proposed.Finally,theoretical analysis is made from the aspects of node storage space occupation,codec complexity and network resource consumption.(2)Design a copyrighted work content storage scheme based on the above hyperledger fabric.In order to meet the storage requirements of copyright management system for copyrighted works,a new information recording scheme is proposed.By designing a new structure of the proposal,the chaincode verification of endorsement process for copyrighted works is avoid,which reduce the consensus overhead;and copyright works be avoid recording in the state database,which reduce the storage usage The scheme records the content of the work in the block file of the hyperledger fabric while reducing the storage overhead and the consensus delay.(3)Based on the hyperledger fabric open source code development of copyright management prototype system,and set up an experimental network for experimental testing.The experimental results show that in the same network with 8 nodes,the storage space of the prototype system node is only about 25% of the nodes of the hyperledger fabric system,and the storage of the copyrighted work content will not be causing extra storage footprint in the node's state database.