# Blockchain-Driven Intelligent Scheme for IoT-Based Public Safety System beyond 5G Networks
## 2 Related Works  
In the previous section, we discussed various blockchain-based 6G applications such as smart healthcare, smart grid, smart agriculture, smart manufacturing, etc. After studying these real-world applications in detail, we identified that public safety is an essential domain that requires more security attention. Various researchers consider public safety applications and offered security and privacy approaches for road safety, criminal activity monitoring, on-site safety, etc. They deal with data security, person authentication, information confidentiality, and integrity issues. For example, [PERSON] et al. [32] addressed the dynamic ridesharing issue in public transport systems. They proposed GPS tracking and a two-way rating system using the mobile application's facial recognition module.  
In the aforementioned work, the researchers incorporated different security mechanisms using mobile applications and cryptographic primitives. However, they are yet to consider data consistency, traceability, and scalability. Therefore, [PERSON] et al. [33] utilized various technologies such as blockchain, IoT, edge, fog, and cloud computing for smart public safety. They proposed the BLockchain-ENabled Decentralized Microservices Architecture for Smart public safety, named BlendMAS, scheme that offers security and data access control for the public safety system. Then, in [34], [PERSON] et al. worked on the safety and security of video surveillance systems. They proposed edge computing and a smart-contract-based lightweight privacy protection (Lib-Pri) scheme that identifies the fugitives using their facial features. [PERSON] et al. [35] proposed a smart-contract-based collaborative intrusion detection system that prevents cyberattack and data theft. Their proposed scheme manages the trust between the nodes and prevents the input false attack in the IDS.  
Furthermore, [PERSON] et al. [36] focused on the on-site safety issue due to the equipment defects and environmental hazards for tower crane safety management. They proposed a blockchain-based framework utilizing Hyperledger Fabric that offers security and authenticity with trust at the construction site. Moreover, [PERSON] et al. [37] addressed data vulnerability, confidentiality, privacy, and the centralized key storage issue of the IIoT data storage applications. To overcome this problem, they proposed a Shamir threshold cryptography scheme with blockchain called STCCChain that offers availability, accountability, and integrity of the data. Then, [PERSON] et al. [38] proposed a blockchain-enabled access control scheme using multisignature that protects autonomous vehicle data. They collected and stored vehicle data using a dashboard camera and global positioning system. Their findings showed that the proposed scheme offers data privacy and security with lower verification time and latency. Table 1 shows the comparative analysis of existing works for public safety applications by incorporating security, 6G network with their objective, pros, and cons. From the overall study, we observed that many researchers carried out a lot of research work in the security field for smart public safety applications. In most papers, the research community focuses on the role of different security approaches, such as cryptographic and mobile applications. However, very few of them incorporated blockchain-based security in public safety applications. Therefore, we included a blockchain-based security approach using 6G wireless communication in the public safety application domain.