In many IoT architectures, sensor data must be passed to cloud services for further processing. Traditionally, trusted third parties have been used to secure this data. In this talk we explore an alternative approach: the use of a blockchain network structure, which can reduce operating costs and help keep systems verifiable and trustworthy. Using the Ethereum blockchain as an example, we illustrate a technique to keep the system free from “trusted-third-parties” and will reference real-world example applications, such as facial-recognition-based payment systems.