A survey of consensus algorithms in public blockchain systems for crypto-currencies

In recent years, crypto-currencies (a form of decentralised digital currencies) have been quite popular as an alternative payments. They are underpinned by a breakthrough technology called Blockchain which extensively use number cryptographic mechanisms and other advanced techniques from the domain distributed computing. This blockchain has received unparalleled attention academia, industry, governments worldwide is considered to potential disrupt several application domains, than currencies, touching all spheres our lives. The sky-rocket anticipation its caused wide-scale exploration usage in different domains. resulted plethora systems for various purposes. However, many these suffer serious shortcomings related their performance security, need be addressed before any adoption can achieved. A crucial component system underlying consensus algorithm, determines security ways. Therefore, address limitations systems, existing well novel algorithms introduced. systematic analysis will help understand how why particular performs way it functions. Towards this aim, there works that surveyed reviewed algorithms. some major shortcomings. For example, factors upon analysed not comprehensive. Importantly, wide range utilised public supporting mainly variants. Such variants internal at all. article fills gaps analysing leveraged using comprehensive taxonomy properties. We also more hundred top belonging categories properties implicate trends crypto-currencies. Finally, we presented decision tree used tool test suitability under criteria.