ReapChain was developed to address the issues of the current IoT Blockchain. It combines public and private Blockchains using the Shell-Core structure and implements a two-way consensus algorithm (PoDC) to overcome the problems of scalability, security, and decentralization. Additionally, ReapChain ensures data integrity and security by providing object PID through the Reap SDK, enabling mutual verification between devices and preventing data forgery. With its technology, ReapChain aims to establish a new IoT Blockchain ecosystem characterized by enhanced security and transparency.