A TDE-based Multi-node Data Categorized Transfer Storage Scheme in Consortium Blockchain

In consortium blockchain, full nodes face challenges such as increased storage space usage, higher storage costs, and longer query times due to the growing amount of data. In this paper, we propose a secure and flexible solution to address these issues by transferring old blockchain data to a trusted storage system. First, we introduce a full-node data transfer scheme that packages and stores block data off-chain to tackle insufficient node storage space. Second, we combine blockchain with Transparent Data Encryption (TDE), which stores the data in ciphertext to ensure the security of off-chain data. Additionally, in order to restore the initial state of the node, we add the data recovery function. Experimental results demonstrate that this scheme can save 60% to 70% of node storage space, improve query efficiency by 20% to 50%, and ensure data security.