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Review of Challenges in Blockchain Scalability

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Review Systematic Literature Review of Challenges in Blockchain Scalability Dodo Khan 1,*, Low Tang Jung 1,2 and Manzoor Ahmed Hashmani 1,2 Citation: Khan, D.; Jung, L.T.; Hash- mani, M.A. Systematic Literature Review of Challenges in Blockchain Scalability. Appl. Sci. 2021, 11, 9372. https://doi.org/ 10.3390/app11209372 Academic Editor: Gianluca Lax Received: 10 August 2021 Accepted: 3 October 2021 Published: 9 October 2021 Publisher’s Note: MDPI stays neu- tral with regard to jurisdictional claims in published maps and institu- tional affiliations. Copyright: © 2021 by the authors. Li- censee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and con- ditions of the Creative Commons At- tribution (CC BY) license (http://crea- tivecommons.org/licenses/by/4.0/). 1 Department of Computer and Information Science, Universiti Teknologi PETRONAS (UTP), Seri Iskandar 32610, Malaysia; lowtanjung@utp.edu.my (L.T.J.); manzoor.hashmani@utp.edu.my (M.A.H.) 2 High Performance Cloud Computing Center (HPC3), Universiti Teknologi PETRONAS (UTP), Seri Iskandar 32610, Malaysia * Correspondence: dodo_18001633@utp.edu.my Abstract: Blockchain technology is fast becoming the most transformative technology of recent times and has created hype and optimism, gaining much attention from the public and private sec- tors. It has been widely deployed in decentralized crypto currencies such as Bitcoin and Ethereum. Bitcoin is the success story of a public blockchain application that propelled intense research and development into blockchain technology. However, scalability remains a crucial challenge. Both Bitcoin and Ethereum are encountering low-efficiency issues with low throughput, high transaction latency, and huge energy consumption. The scalability issue in public Blockchains is hindering the provision of optimal solutions to businesses and industries. This paper presents a systematic litera- ture review (SLR) on the public blockchain scalability issue and challenges. The scope of this SLR includes an in-depth investigation into the scalability problem of public blockchain, associated fun- damental factors, and state-of-art solutions. This project managed to extract 121 primary papers from major scientific databases such as Scopus, IEEE explores, Science Direct, and Web of Science. The synthesis of these 121 articles revealed that scalability in public blockchain is not a singular term. A variety of factors are allied to it, with transaction throughput being the most discussed factor. In addition, other interdependent vita factors include storages, block size, number of nodes, energy consumption, latency, and cost. Generally, each term is somehow directly or indirectly reli- ant on the consensus model embraced by the blockchain nodes. It is also noticed that the contem- porary available consensus models are not efficient in scalability and thus often fail to provide good QoS (throughput and latency) for practical industrial applications. Our findings exemplify that the Internet of Things (IoT) would be the leading application of blockchain in industries such as energy, finance, resource management, healthcare, education, and agriculture. These applications are, how- ever, yet to achieve much-desired outcomes due to scalability issues. Moreover, Onchain and off- chain are the two major categories of scalability solutions. Sagwit, block size expansion, sharding, and consensus mechanisms are examples of onchain solutions. Offchain, on the other hand, is a lighting network. Keywords: blockchain; distributed ledger technology scalability; consensus model; scalability solu- tion; throughput 1. Introduction Many online transactions between individuals or organizations are based on a cen- tralized controlled system (or controlled by a third-party organization). For example, a bank or a credit card vendor is acting as a third-party entity in executing a digital payment or money transfer process between two organizations (or individuals). The third-party vendor takes a fee for every successful transaction. In this centralized mechanism, the third-party controls and manages almost all the information of the stakeholders that are involved in the online transaction. This approach requires the third party to uphold the Appl. Sci. 2021, 11, 9372. https://doi.org/10.3390/app11209372 www.mdpi.com/journal/applsci

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