Redactable blockchain for fully editable operations in a private chain environment

The article proposes an redactable blockchain scheme that realizes full editing operations in a private chain environment. Compared with ordinary editable blockchain schemes, this scheme adopts a double-trapdoor chameleon hash family based on both one-time trapdoor and long-term trapdoor to realize update, insertion, and deletion operations on the data on the chain. Moreover, block administrators with trapdoor keys do not need to recalculate the hash value when modifying the data, which reduces the computation and storage cost and is friendly to users with limited resources. Also, we demonstrate the security of the proposed scheme. The final performance analysis shows that the proposed scheme has good efficiency and performance compared to schemes that use accumulators for full edit operations.