블록체인 기반 개인정보 활용 동의에 대한 상호 신뢰 시스템 연구 및 구현

Current online service users provide their personal information to service providers by agreeing to the terms of the service in order to use the service. The contents of the terms and conditions agreement are maintained and managed by the service provider, but it is difficult for the user, who is the personal information provider, to agree on what contents they have agreed to and what contents have been changed compared to the time of their initial agreement. In response to these issues, the EU's GDPR regulations strengthen the methods for collecting and using personal information by stating that the data controller must be able to prove that the data subject has agreed to the processing method. Therefore, in order to protect the personal information of users of online services, it is necessary to strengthen the management model for 'agreement' of the use of personal information users acquired by the operator. This study designs and implements a blockchain-based subscription agreement verification system that allows users who use online services to explicitly manage access to personal information when agreeing to the terms of service, and that mutual trust between online service providers and users is possible.