Efficient and Verifiable Blockchain Data Query Scheme Based on External Database

Although the development of blockchain is getting faster and faster, and the application scenarios are becoming more and more extensive, it still faces problems such as low efficiency of data query and single query function. The database has a powerful and mature data management system, which has a natural advantage in solving these problems. Therefore, based on the method of external database, this paper extracts blockchain data and stores it off-chain, and introduces third-party service providers to provide users with diversified query services. To ensure that users can obtain correct and complete query results from service providers, this paper uses an authentication data structure to design a result verification scheme, which supports users to further verify the results after obtaining the query results. The experimental results show that this scheme can provide users with efficient query service and users can verify the results.