Blockchain-Based Internet of Things and Industrial IoT: A Comprehensive Survey

Table 2

Comparison table based on different parameters of the existing data storage and management technique (cont…).

S. no.	Reference	Year	Technology used	Summary of the work	Shortcoming of the work	Possible solution	Implementation remarks
6.	[54]	2020	(a) Smart contract, (b) array	Explored the cost of storing the collected data in blockchain for low computation power in terms of storage and processing; for this, they worked on different ways to store data	Key generation and communication protocols need to be addressed	Use smart contracts for generation of keys and store them through blockchain	Solidity (Ethereum) and ganache can be used
7.	[59]	2020	(a) IOTA Tangle, (b) IPFS	IOTA Tangle and IPFS-enabled decentralized IIoT data management framework based on the proof-of-concept protocol	Only the theoretical analysis of the solution	Smart contract for this system can be designed for sharing the IIoT data and storing them in the IPFS	Solidity language can be used for writing the smart contracts
8.	[60]	2021	(a) Smart contract, (b) IPFS, (c) elliptic curve integrated encryption	Off-chain storage and blockchain-enabled service model for the IoT system in which node credentials and records are stored in IPFS	Carelessly investigated the smart contract implementation	Remix IDE and solidity-enabled contracts can be designed	Proof-of-authority model consumes less GAS than the proof-of-work model
9.	[61]	2021	(a) Golang, (b) IPFS, (c) public key infrastructure	FusionChain: a decentralized lightweight framework to store the IoT data and solve the memory required to store a full copy of blockchain in the device	The formal verification of smart contracts is not done	The tools such as Oyente and SmartChecker can be used to provides the full analysis of the contract	Only of memory and of CPU on the ARM core are required for the consensus process
10.	[62]	2021	(a) IoT, (b) IPFS, (c) smart contract	A decentralized prototype model for smart cities using IoT, blockchain, and IPFS	In-depth study of the proposed prototype model has not been done	Cryptography primitives can be used to provide more security, privacy, and trust in IoT-enabled smart cities applications	Formal security validation tools can be used to verify the security protocols