Embodiments of the present specification disclose an identity registration method, apparatus, and device. The solutions include the following: description information submitted by a user for a secure application to be installed is obtained, where the secure application is a program used to obtain trusted data; installation package data corresponding to the secure application is retrieved based on the description information; the secure application is installed in a trusted execution environment based on the installation package data; and the description information is added to a digital identity document of the user in a blockchain network.