Internet of things (IoT) is changing the data-driven smart industry due to the massive availability of IoT data. Nevertheless, the IoT also poses some challenging issues like decentralization, poor interoperability, privacy, and security vulnerabilities. The recent advent of blockchain can potentially tackle the above issues. The marriage of blockchain and IoT was investigated and named this integration as the blockchain of things (BCoT).In particular, the IoT and blockchain technology was introduced first. The convergence of blockchain and IoT was introduced, and the proposal of BCoT architecture was presented.The application of the Internet of things in the industry was further discussed. Finally, the open research directions in the field were outlined.