BLOCKCHAIN-BASED DATA QUERYING METHOD, DEVICE AND APPARATUS, AND READABLE STORAGE MEDIUM

The present invention relates to the field of blockchain-based data querying methods, devices and apparatuses, and readable storage mediums. Disclosed are a blockchain-based data querying method, device and apparatus, and a readable storage medium. In the invention, a data query request is transmitted to multiple information systems, and then information ciphertexts returned by the multiple information systems are received, thereby obtaining query data from the multiple information systems without having to send multiple data query requests, reducing the workload of a user querying data, and conserving a large amount of resources. The method comprises: receiving a data query request from a user, and extracting a digital certificate, personal information and a request signature for use in a query; performing authentication on the digital certificate, personal information and request signature; if the authentication is successful, transmitting the data query request to multiple information systems; and receivin