# Blockchain-Driven Intelligent Scheme for IoT-Based Public Safety System beyond 5G Networks
###### Abstract  
Mobile applications have rapidly grown over the past few decades to offer futuristic applications, such as autonomous vehicles, smart farming, and smart city. Such applications require ubiquitous, real-time, and secure communications to deliver services quickly. Toward this aim, sixth-generation (6G) wireless technology offers superior performance with high reliability, enhanced transmission rate, and low latency. However, managing the resources of the aforementioned applications is highly complex in the precarious network. An adversary can perform various network-related attacks (i.e., data injection or modification) to jeopardize the regular operation of the smart applications. Therefore, incorporating blockchain technology in the smart application can be a prominent solution to tackle security, reliability, and data-sharing privacy concerns. Motivated by the same, we presented a case study on public safety applications that utilizes the essential characteristics of artificial intelligence (AI), blockchain, and a 6G network to handle data integrity attacks on the crime data. The case study is assessed using various performance parameters by considering blockchain scalability, packet drop ratio, and training accuracy. Lastly, we explored different research challenges of adopting blockchain in the 6G wireless network.  
blockchain; 6G network; applications; blockchain services; unmanned aerial vehicle; AI 202  
and sensitive information that must be secured from adversaries, which can misuse this information by tampering with it or selling it to the black market. Another example is for public safety applications (e.g., IoT-based crime detection), where a criminal tries to modify the central repository that holds the criminal records. The adversary can modify or tamper the criminal records, i.e., it can perform injection attacks to change the criminal's identity (e.g., remove the traces of criminal evidence). Therefore, superior technology such as blockchain is required to overcome the aforementioned security issues in 6G-based smart applications [2]. It strengthens the security and privacy of wireless communication networks by utilizing its essential characteristics, i.e., immutability, scalability, security and privacy, transparency, and decentralization [3; 4].  
Blockchain is a decentralized ledger technology that builds trust between various network services and applications such as smart grids, smart agriculture, smart cities, unmanned aerial vehicle (UAV) communications, and vehicle-to-vehicle (V2V) communications. It also delivers improved services such as interoperability, distribution, immutability, faster settlement, unanimity, and many more. As a result, blockchain is associated with a 6G-based wireless communication network and offers a secure and trusted environment for data protection in an IoT-based public safety environment. For example, [PERSON] et al. [5] discussed the applicability of blockchain technology with the emerging 6G network for secure data sharing. They proposed a privacy-preserving architecture for industrial services and applications. Then, [PERSON] et al. [6] discussed the significance of blockchain in 6G wireless communication networks. They studied various applications of 6G with security and privacy threats and explored blockchain-based solutions for smart and industrial IoT-based applications. In [7], the authors used blockchain secure storage to store crime images by applying watermarking and cryptographic blockchain in forensic applications. There has been a lot of research work in the field of the integration of blockchain in 6G-based real-world applications. A detailed explanation of each application is as follows.