# Policy-Based Smart Contracts Management for IoT Privacy Preservation
## 2 Related Works
### Existing Projects  
The industry sector increasingly deploys the blockchain network to manage IoT devices. Helium (the helium blockchain. [[https://www.helium.com/technology#blockchain](https://www.helium.com/technology#blockchain)]([https://www.helium.com/technology#blockchain](https://www.helium.com/technology#blockchain)) (accessed on 4 January 2024)) uses a blockchain network to link low-power IoT devices (such routers and microchips) to the internet. The blockchain-based wireless internet grid of Helium employs radio technology to improve internet connections and significantly cut down on the amount of electricity required to run \"smart\" equipment.  
Xage (Xage. [[https://eepower.com/news/xage-launches-as-first-blockchain-protected-security-platform-for-the-iot/#](https://eepower.com/news/xage-launches-as-first-blockchain-protected-security-platform-for-the-iot/#)]([https://eepower.com/news/xage-launches-as-first-blockchain-protected-security-platform-for-the-iot/#](https://eepower.com/news/xage-launches-as-first-blockchain-protected-security-platform-for-the-iot/#)) (accessed on 4 February 2024)) is the first IoT security platform secured by a blockchain. It focuses on industrial applications for sectors including agriculture, energy, transportation, and utilities. It aims to make IoT devices impenetrable and have secure communication channels between smart objects.  
Atonomi (Atonomi. [[https://atonomi.io/](https://atonomi.io/)]([https://atonomi.io/](https://atonomi.io/)) (accessed on 5 January 2024)) uses blockchain technology to support security for IoT-connected devices. The company's solution includes immutable ledger-based device identity validation, reputation tracking to identify device irregularities, and cross-manufacturer transactional support among approved devices. It can be utilized for autonomous cars, healthcare, smart homes, and smart cities.  
IOTA (Iota. [[https://files.iota.org/comms/IOTA_for_Business.pdf](https://files.iota.org/comms/IOTA_for_Business.pdf)]([https://files.iota.org/comms/IOTA_for_Business.pdf](https://files.iota.org/comms/IOTA_for_Business.pdf)) (accessed on 5 January 2024)) views its Tangle network, which uses distributed ledger technology for \"tamper-proof data, fee-free microtransactions, and low resource needs\", as the \"backbone of IoT\". Through the automated trade of data, commodities, and services, IOTA's Industrial Marketplace also facilitates industrial IoT.  
Chroncieled (Chroncieled. [[https://www.chroncieled.com/](https://www.chroncieled.com/)]([https://www.chroncieled.com/](https://www.chroncieled.com/)) (accessed on 5 January 2024)) is a platform that successfully combines IoT and blockchain technologies to provide a full supply chain solution. Now, Chronicled's main areas of interest are the food and drug supply businesses. The company uses IoT-enabled shipping containers and sensors to obtain real-time data on the delivery process.  
The aforementioned projects benefit from blockchain, which allows organizations to control their IoT devices for their businesses. As the business grows, it may need to outsource IoT device data to third parties, for example, to maintain equipment, update software, or track the delivery of items. Our proposed model could help preserve organizational privacy by allowing them to define policies according to their privacy preferences and generate smart contracts that comply with these rules.