Hdac is an IoT contract platform based on the blockchain, which not only exchanges but also can restrict the usage according to the purpose as it is ‘Smart Coin’ which controls the connected devices. Hdac is a blockchain based platform backed by Hyundai BS&C.; The platform allows IoT devices to quickly and effectively communicate, handling identity, authentication, data storage and micro-payments. Hdac will develop a new blockchain based on multichain capable of handling the scale and contract functionality required for an IoT platform, as well as bridges to Bitcoin and Ethereum to facilitate payments.