# Blockchain for Future Wireless Networks: A Decade Survey
## 2 Background
### Blockchain Technology
#### 2.3.2 Integration of Blockchain and WNs
In this paper, we analyze the existing blockchain-based solutions to mitigate the security attack in each layer of the OSI. After studying the current security and privacy issue, we propose an architecture enabling blockchain technology for WNs. Table 1 represents a comparative analysis of the existing surveys proposed with blockchain-based WNs on various parameters, such as contributions and observations. \begin{table}
\begin{tabular}{p{42.7 pt} p{113.8 pt} p{113.8 pt} p{113.8 pt}} \hline \hline
**Year** & **Author** & **Contribution** & **Observations** & **Remarks** \\ \hline
2016 & [PERSON] et al. [32] & Discussed security attacks, protocols, and algorithms in WNs for physical layer & Discussion about security and privacy in other layers have lacked & Cover security and privacy in every layer \\ \hline
2017 & [PERSON] et al. [58] & Discussed blockchain infrastructure for IoT & Analyzed confidentiality, integrity and availability with different use & Did not discuss the vulnerability in the security \\ \hline
2018 & [PERSON] et al. [59] & Analyzed existing privacy-preserving and authentication schemes for 4G and 5G & Did not discuss layer-wise security in WNs & Study on layer-wise security for different generation networks is required \\ \hline
2019 & [PERSON] et al. [60] & Explored IoT-based system with Blockchain for SDN platforms & Application of blockchain in subsystem is lacking & Blockchain usage in smart applications, identity management, etc., that need emphasis \\ \hline
2019 & [PERSON] et al. [61] & Review of blockchain-based applications through multiple domains, established trends, key themes, and emerging areas & Security requirement in different application domain has not been covered & Analyzed security requirements using blockchain with scalability, privacy, interoperability, audit, latency, and visibility issues \\ \hline
2019 & [PERSON] et al. [62] & Reviewed existing approaches and security tools for performance enhancement of decentralized applications based on smart contract & Did not discuss problems and limitations of smart contract in individual applications & A comparison of blockchain-based solutions with other existing solutions is required \\ \hline
2019 & [PERSON] et al. [65] & A Blockchain scheme for IoT & Comparison of existing security techniques with blockchain techniques is missing & Should provide a comparative analysis of existing techniques with blockchain-based approaches \\ \hline
2019 & [PERSON] et al. [63] & Surveyed Blockchain for smart communities and analyzed process models for secure transactions & Comparison of Blockchain with existing security solutions is lacked & Survey on blockchain-based security and privacy challenges needs to be highlighted \\ \hline
2019 & [PERSON] et al. [74] & Studied blockchain in healthcare domain with various features such as data integrity, access control, etc. & Comparison of consensus mechanism of blockchain is not included & Should emphasize application of blockchain for security and privacy perspective \\ \hline
2020 & [PERSON] et al. [64] & A blockchain-based identity management solutions & Highlighted conceptual analysis for identity management solutions & Real-time applicability of blockchain-based solution need to be taken into consideration \\ \hline
2020 & [PERSON] et al. [66] & Discussed blockchain for cloud data exchange based on transaction management, and reputation systems & Analysis of existing security methods with blockchain for cloud is lacking & Existing blockchain-based solutions for cloud data exchange need to be discussed in detail \\ \hline
2020 & [PERSON] et al. [14] & Discussed blockchain in 5G and future WNs & Did not cover comparison of blockchain with another approaches of security and privacy issues in WNs. \\ \hline \hline \end{tabular}
\end{table} 
Table 1: A comparative analysis of the existing survey with the proposed study on the blockchain-based solutions for the security and privacy issues in WNs.