Data is accumulated daily in a society where the Internet has infiltrated. In order to further develop the industry, it is effective to establish a framework that can share and use data resources widely. If the IoT devices and various services trade data without human intervention, they will be able to provide new services that enrich our lives. If an authentication and authorization system that can openly confirm the data owners and give authority to them is constructed, various services, not limited to a single service, can authenticate and authorize the devices, and the data sharing will be promoted. In this paper, we propose a system that uses blockchain as a database for storing credentials and authority information and allows users and services to perform authentication and authorization based on that information.