IoT Chain is a secure, lite OS for the Internet of Things. The Internet of Things (IoT) is a term used to describe the interconnection of computer devices embedded in everyday objects enabling them to share data. IoT Chain solves current IoT security and safety issues using distributed ledger technology. Using a hybrid approach of blockchain, Practical Byzantine Fault Tolerance (PBFT) consensus, and blockless Directed Acyclic Graph (DAG) architecture, ITC is able to create a decentralized IoT network with unparalleled speed and security that allows users to control and monetize their data.