How to retrieve access data to a blockchain network using a highly available trusted execution environment

摘要

Disclosed herein are methods, systems, and apparatus comprising computer programs encoded on computer storage media for retrieving data from external data sources for processing within a blockchain network. One of the methods may include receiving a request for data comprising encrypted data, wherein the encrypted data comprises access data encrypted using a service public key of the key management node; selecting a relay system node from a plurality of relay system nodes sharing a service secret key of the key management node; sending a request to a relay system node; receiving a response provided from the relay system node, wherein the response includes result data and a digital signature, wherein the digital signature is generated based on the result data and a service secret key of the key management node; and sending the response to the client.