Research On Blockchain-based Image Copyright Trading And Privacy Protection

The increasing prevalence of digital content distribution on the Internet has resulted in piracy and illegal use of digital products,which has led to increasingly acute copyright disputes.Most of the existing digital copyright management platforms are centralised,which can lead to leakage of private data once the central database is attacked or if the platform administrators are driven by profit to sell the private information of digital content creators.Traditional centralised copyright protection systems also face many problems,such as high registration costs,long acceptance times,and vulnerability to vandalism and tampering.Blockchain is currently a cutting-edge technology for information security,with the advantages of decentralisation,tamper-proof and traceability,providing new ideas and new solutions for digital copyright trading and protection.However,blockchain needs to disclose some information in order to achieve consensus bookkeeping and synchronisation of data between distributed nodes,so there is a risk of user privacy data leakage during the transaction process.To address these issues,this thesis investigates blockchain-based image copyright trading and privacy protection technologies.First,this thesis builds a prototype system for copyright registration and trading of digital images based on the Ethereum blockchain,and performs similarity detection on the image information and text information for copyright registration to ensure the originality and uniqueness of the images and information for copyright registration in the system.Secondly,to address the risk of privacy leakage in the copyright trading process,this thesis uses a combination of AES(Advanced Encryption Standard)and ECC(Elliptic Curves Cryptography)encryption algorithms for the main user's private data to provide double security protection.Finally,IPFS(Inter Planetary File System)is used for distributed storage of images,saving images to the IPFS system and returning hash values as address information to the blockchain,in order to solve the problem of small storage space and difficult expansion of the blockchain.