Universal Redactable Blockchain

Abstract

Due to the immutability of blockchain, many applications are emerging by providing trust to the trustless Internet. However, immutability becomes a weakness in some applications that require modification and deletion, such as personal information and SNS(Social Network Service), and cannot use blockchain technology. Therefore, in this paper, we propose a redactable blockchain scheme that can be used universally regardless of the consensus algorithms and blockchain types. In addition, without using a heavy cryptographic algorithm, and needing to re-mine, the proposed scheme can delete and modify content in the ledger, so it is efficient. Moreover, the proposed scheme can modify and delete at the transaction level. Additionally, the proposed scheme supports encryption for protecting the privacy and there is no need to save the original content after modification or deletion.