A secure and lightweight data management scheme based on redactable blockchain for Digital Copyright

Traditional Digital Copyright (DC) management system faces a single point of failure, and has no strict traceability. Meanwhile, the current blockchain-based DC schemes take less consideration to the authenticity of DC information stored on the blockchain. Additionally, the full node storage overhead and computation overhead of information retrieval and traceability increase significantly with the number of blocks. Therefore, in this paper, we propose a secure and lightweight data management scheme based on the redactable blockchain for DC. Users generate their public and private keys, which provide a legitimate signature. Then, we propose a transaction control mechanism based on ECDSA, which means that the storage of DC information can only be accomplished by providing a legitimate and verifiable signature, including registration and transaction information. Furthermore, we adopt blockchain to record DC information and the chameleon hash algorithm to modify DC information stored on the blockchain when making DC transactions, while keeping the block headers unchanged. System analysis and experimental results confirm that our scheme can address a single point of failure and ensure the authenticity of the information. Meanwhile, our scheme effectively reduces full node storage overhead, and computation overhead of information retrieval and traceability.