Abstract:

As blockchain and smart contracts evolve, the demand for updatability of data and contracts has become increasingly prominent. To achieve data modification without compromising the security, coherence, and integrity of the blockchain, the concept of redactable blockchain has been proposed, with the chameleon hash algorithm serving as a key method for editing block data. This paper presened a redactable blockchain scheme based on the chinese remainder theorem. The scheme designed a chameleon hash algorithm using decentralized weighted key generation, utilizing threshold and weighted secret sharing and multi-party computation to ensure the security and invisibility of the keys. Additionally, by eliminating trusted central authorities and secret distributors, it prevented single points of failure and malicious behavior. Furthermore, the scheme employed group signature technology with privacy protection to verify and trace editors, ensuring the anonymity and reliability of the redactable blockchain without actively revealing the identities of the signers. This paper conducts a security analysis and experimental evaluation of the proposed scheme, comparing it with existing redactable blockchain solutions. The results indicate that this scheme enhances security while maintaining high efficiency.

Key words: redactable blockchain, weight, decentralization, anonymity