Traceable Decentralized Policy-Based Chameleon Hash Scheme for Blockchain Rewriting

Blockchain technology is generally immutable, but there are limitations to the practical application of this feature. Therefore, a redactable blockchain was introduced. Based on the literature and the practical needs of redactable blockchains, we propose a new type of chameleon hash function with stronger security features, a Traceable Decentralized Policy-Based Chameleon Hash, which is named TDPCH in this paper. Then, the TDPCH is applied to the design of redactable blockchain. Our scheme has a better application scenario, which can help realize the adaptation of the blockchain, and has the security characteristics of decentralization of authority management and accountability of modifiers.