This document discusses using blockchain technology to secure data management for supply chain management applications that utilize Internet of Things (IoT). It first provides background on IoT and blockchain individually, explaining how IoT connects devices to share data but also raises security and privacy issues, while blockchain provides a distributed ledger to securely record transactions without a central authority. The document then reviews related work applying blockchain to areas like crowdsensing and supply chains. It proposes that blockchain could help address some security issues in IoT by providing secure identity management, product traceability, automated smart contracts, and time-stamped records for supply chain applications. However, challenges remain to implement these solutions in practice.