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| Ref | IoT app | IoT devices | Consensus algo. | Security analysis techniques | Energy and data size tests | Platform | Environment control smart contracts | Trace and distribution smart contract | Financing smart contract | Other smart contracts and notes |
|
| [12] | Yes | Temperature sensor, water level sensor, oxygen sensor, pH sensor, and water pump | PBFT | Not mentioned | Yes | Hyperledger Fabric | No | Basic | No | Records history of all transactions and device management |
|
| [13] | Yes | Temperature sensor, light sensor, and humidity sensor | Not mentioned | Not mentioned | Yes | Ethereum | Yes | Yes | Basic | Storage smart contracts |
|
| [14] | No | No IoT app mentioned | PoW | Not mentioned | Yes | Ethereum | No | Yes | Yes | No other smart contracts |
|
| [15] | No | No IoT app mentioned | PoW | Yes | Yes | Ethereum | No | No | No | The agent orchestrates offloading services |
|
| [16] | Yes | Sensors that manage water, air, sunlight, and soil quality escarpments | Not mentioned | Yes | Basic | Hyperledger Fabric | No | Yes | Yes | Storage of planting and farm information |
|
| [17] | Yes | Sensors, cameras, GPS locator, and 4G communication | Not mentioned | Not mentioned | Basic | Ethereum | Yes | Yes | Yes | Use case of soybean supply chains |
|
| [20] | Not mentioned | No equipment mentioned | Not mentioned | Yes | No | Ethereum | No | Yes | Yes | Insurance claim |
|
| [21] | Yes | Cameras, smart sensors, RFID, and GPS | Their consensus mechanism (OASCs’ consensus network) | Yes | Yes | It looks like an Ethereum sys. | No | Yes | Basic | Automated workflows of OASCs |
|
| Our survey | Yes | Temperature sensor, humidity sensor, light exposure sensor, and soil pH sensor | PoW (in future PoS) | Yes | Yes | Ethereum (in future Ethereum 2.0) | Yes | Yes | Basic | No other smart contracts |
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