The problem of the existing internet of things is solved by ReapChain. There is a The Shell-Core structure, which combines public and private Blockchains, and the two-way consensus algorithm (PoDC), has been used to overcome the three problems of the existing Blockchain. There is a It is possible to secure clean data by improving security through mutual verification between devices and preventing the forgery of data by giving the PID of an object through the Reap SDK. There is a ReapChain is creating a new world with technology that has both security and transparency.