The resource of the internet of things (IoT) devices is limited and external resources are needed.While a centralized cloud solution can provide sufficient computing and storage resources for the internet of things.However,the cloud cannot process large amounts of data promptly,due to some factors such as network bandwidth.The scheme based on cloud uses static password authentication and plaintext storage mechanism,thus there are some security problems.The emerging technology of blockchain brings a new idea to solve the security problems of the internet of things.And edge computing shortens the distance of data processing and enhances the real-time performance.Therefore,this paper will use these two technologies to solve the current problems in the internet of things.