Privacy is one of the biggest challenges facing IoT, so Hdac configures unique Hdac Platform networks for all types of users. The platform acts to support payments with state-of-the-art hardware wallets immune to viruses. From private to public and back again, Hdac Platform is configured as a hidden network with safe tunneling between a user and device to combat hacks, privacy invasions and external attacks. Mutual authentication between devices and users is crucial for a reliable private blockchain, which fundamentally will only be practical if it interacts with the public blockchain. The technology can be applied to smart factories, smart homes, smart buildings, and various industries. Also, M2M transaction for mutual contracts and operation between IoT devices are implemented to bring a platform where rational consumptions and transactions are possible.