Review of Challenges in Blockchain Scalability

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Review of Challenges in Blockchain Scalability ( review-challenges-blockchain-scalability )

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Appl. Sci. 2021, 11, 9372 12 of 27 The findings revealed that most of the publications concerning public blockchain scalability were published in conferences and journals, i.e., 54 papers out of the 121 articles were published in conference proceedings, followed by 33 in journal publications. The remaining articles were in book chapters (20), symposium (8), and workshops (6). Figure 5. Figure illustrates the analysis of selected paper types in the blockchain domain. Figure 6 shows the statistics about the geographical distribution of the selected pa- pers. It is noticed that China leads with 24 articles, followed by the USA with 13 papers (published in academia or industries). Moreover, India is the 4th leading country with eight papers, and closely followed by UK, Switzerland, and Australia with eight, seven, and seven papers, respectively. Only seven countries have over five publications. The rest are below five. This analysis reflects the interest of the research community on blockchain scalability around the world. Figure 6. Figure illustrate the analysis of geographic distribution of selected paper in the blockchain domain. 6. RQ1: How Scalability Issue Can Impact Blockchain Implementation? Blockchain was made famous by Bitcoin in 2008 [2], and since then it has already advanced into several industries. There are claims that blockchain is the technology that will disrupt the technology eco-system. However, it is yet to witness much growth and disruption apart from cryptocurrency. Figure 7 is about public blockchain applications except cryptocurrency. From our SLR, cryptocurrency (Bitcoin and Ethereum) is noted as the state-of-the-art application of public blockchains. Next to cryptocurrency, IoT is the most discussed blockchain-related application, with 17 publications. Our findings also re- vealed that although blockchain is very applicable to IoT applications, it is yet to achieve the preferred outcomes due to scalability issues. Blockchain appeared to be influencing

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