An Efficient Data Query Method of Blockchain Based on Index

In many blockchain applications, apart from storing the original data, it is also necessary store the data operation records in the blockchain for audit or security. Yet, the traditional blockchain, generally cannot meet the user's demand for data query. In order to solve this problem, we propose a novel block structure, the block body into an index layer and a data layer. On this basis, we further develop two in the index layer to aggregate the data and its operation records for efficient query. Specifically, we first build an index for the original data in blockchain by desigining the Abstract-Trie, which has efficient and stable query features. Secondly, we design another index called Operation-Record List to link the operation records to the corresponding original data, and store the first node of each list in the Abstract-Trie, so as to achieve the fast acquisition of the operation records of the original data. Simulation results based on Hyperledger Fabric verify the effectiveness of our optimized block structure in querying of the original data and its operation records in the blockchain.