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Appl. Sci. 2021, 11, 9372 11 of 27 It should be highlighted here that the validity of the form is mandatory to ensure authenticity of the data gathered. The form was therefore rigorously tested on 25 ran- domly selected papers and was revised iteratively per each validating process. 5. Discussion on Consolidated Paper This section discusses the analysis of the 121 selected papers published between 2011 and 2019. It provides insight into the research trend in the last decade on scalability issue and the available solutions for public blockchains. The discussion focuses on the follow- ing: 1. The distribution of blockchain based publications concerning scalability issue over time. 2. The distribution of types of blockchain publication. 3. The distribution of countries of publication. 4. The distribution of application areas of blockchain. To appropriately answer the research questions, the data collected during the data extraction process were properly compiled, and the demographic data were analyzed for the mentioned years of publications. Figure 4 illustrates the year-wise analysis of the selected papers. The increasing in- terest of academic research on public blockchain scalability is observed in a rising number of publications over the years. It is noted that majority of the academic research on public blockchains concerning scalability were in 2018–2019. There was not much blockchain research until 2015, probably because time was re- quired for blockchain to gain momentum after the launching of bitcoin in 2008. The re- search on blockchain scalability started to emerge in 2016, specially in public blockchains. The research in scalability emerged in 2016, when there were 10 published articles; by 2019 there were over 60, a factor of 6× in 3 years. Over these years, blockchain began to disrupt more and more applications on a larger scale. It is therefore logical that the research community should start addressing the burning scalability issue in public block- chains. Figure 4. Figure illustrates the year wise distribution of published paper in the blockchain domain. Figure 5 displays the details on the types of publications for the selected articles in this SLR. The following are the types of publications included (and identified) in this study. • Journals; • Conference proceedings; • Book chapters; • Workshops; • Symposiums.PDF Image | Review of Challenges in Blockchain Scalability
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