Research And Application Of Image Copyright Protection Based On Blockchain

Due to the rapid development of the Internet,networking and digitization of image resources have become a norm,and the problem of image infringement has become more and more serious.The current image copyright protection methods mainly rely on centralized management of copyright information by central institutions,but the central institutions’ copyright management is chaotic and it is difficult to provide credible proof of copyright.On the other hand,the current copyright protection technology is not perfect for substantive audit of image copyright registration,resulting in a large number of infringing images passing the copyright registration audit.To solve the above problems,this thesis researches and applies the blockchain-based image copyright protection.The research contents of this thesis are as follows.1.In the copyright protection system based on the consortium chain,the operational efficiency of the system is directly proportional to the efficiency of consensus reached by the consortium chain,and the huge amount of copyright protection tasks tends to make the system operate less efficiently.In order to improve the operation efficiency of the system,this thesis improves the Practical Byzantine Fault Tolerant consensus algorithm and proposes a Byzantine Fault Tolerant consensus algorithm based on threshold signature.This algorithm simplifies the mesh communication model of Practical Byzantine Fault Tolerant consensus algorithm into a star communication model,thus optimizing the complexity of the algorithm from square level to linear level.Moreover,this thesis simulates and implements a blockchain consensus system,and tests and verifies the Byzantine Fault Tolerant consensus algorithm based on threshold signature.The experimental results show that this algorithm can effectively improve the consensus efficiency.2.To address the problems of inadequate image copyright registration and confusion of copyright management,this thesis proposes a smart contract-based image copyright protection method.The method first extracts image feature vectors by SIFT algorithm as the basis of image copyright confirmation audit,and uses the similarity between feature vectors as the criterion to measure whether the copyright is infringed or not.At the same time,an image confirmation contract is designed,through which the image confirmation contract can realize the automatic originality audit of image copyright and ensure the uniqueness of image copyright.Then,by converting the image copyright into digital token,a non-fungible copyright token is generated based on the image copyright,which makes the copyright open and transparent and non-tamperable.The copyright token management contract is also designed,which only needs to operate on the copyright token in the blockchain network through the copyright token management contract to achieve the secure management of copyright.3.This thesis designs a blockchain-based image copyright protection prototype system.In this system,the Byzantine Fault Tolerant consensus algorithm based on threshold signature proposed in this thesis is used as the consensus algorithm of the system to improve the system operation efficiency,and the smart contract-based image copyright protection method proposed in this thesis is used to realize the whole process of image copyright protection,so that the credible confirmation and secure management of image copyright can be guaranteed.