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Design/Methodology/Approach: This chapter applies tests associated with the adaptive market hypothesis (AMH) and Johansen cointegration test. AMH acknowledges the views of the efficient market hypothesis and behavioural finance approach.

Purpose: Cryptocurrencies are considered a new asset class by multiasset portfolio managers. Hence, we examine the AMH and cointegration in the cryptocurrency market to know whether select cryptocurrencies can be diversified.

Findings: We find that cryptocurrencies are efficient and there is a long-run relationship among constituent series, and there is no short-run causality derived from bitcoin, Ethereum and litecoin to bitcoin, while stellar and Dogecoin have short-run causality to bitcoin.

Originality/Value: This chapter is different from the existing one as this is the first study in which the AMH and Johansen cointegration test are applied to check the efficiency and relationship of Bitcoin, Ethereum, and Monero, Stellar, litecoin and Dogecoin.

In this study, it is examined how to improve the effectiveness of bitcoin market. In this framework, firstly, a wide literature review is made, and different factors that may be effective in this regard are identified. Afterward, an analysis is performed with Hurst method to determine which of these factors are more important. The study of cryptocurrency volatility is important in terms of financial instruments for hedging traditional assets, as well as in terms of pricing. The above results would be particularly useful in terms of portfolio management and risk management. This study discusses various financial issues related to cryptocurrencies, as well as some problems associated with the problems of their forecasting. To solve the problems of forecasting, the authors have not only studied, but also improved the forecasting method based on the machine learning algorithm in the MATLAB system using the tree model. Most of the analysis in the document relies heavily on studies by authors studying this issue. They can help make more informed decisions regarding financial investments and avoid the risks of using cryptocurrencies. The results may also assist regulators in creating a favorable legal environment for the functioning of the cryptocurrency market.

Blockchain technology is an extension of distributed ledger technology and it is used in cryptocurrencies. Many studies describe blockchain technology and cryptocurrency is an application of it in a very broad sense. Blockchain technology has several applications. Some of these applications could have direct or indirect relevance to either or both pillars of sustainability advocated by Crowther, Seifi, and Wond (2019). Extending to cryptocurrencies like bitcoin, one possible connection to sustainability may be the reduction of the use of paper for printing currency notes, which can save forests. Furthermore, the growing cryptocurrency market attracted the investors to focus on the price fluctuations but making them forget about the terrifying carbon problem associated with cryptocurrencies. However, this possibility has not been demonstrated anywhere so far. The issue examined here is how blockchain technology can be used for solving sustainability problems. We initiate a qualitative study of the blockchain technology/cryptocurrency and sustainability using the twin pillars of sustainability: (1) responsibility, (2) governance. An exploratory review linking blockchain technology/cryptocurrency and sustainability and its two pillars revealed many actual and trial applications by corporates as CSR initiatives and other novel programs by various agencies in various countries. In governance, corporates use the CSR route to address sustainability issues. However, no definition is an available linking cryptocurrency, blockchain technology, and sustainability and we developed a definition to fill the gap. This paper stresses that the sustainability perspective has not been used to develop the cryptocurrency definition, but rather technological and legal perspectives have employed.

This chapter introduces the concept of cryptocurrencies such as bitcoin, ether, or litecoin. The chapter describes the history of cryptocurrency, blockchain technology, and the quest for secure digital money, followed by a discussion of cryptocurrency as a phenomenon. Next, it discusses individual cryptocurrencies, including an overview of bitcoin and relevant subgroups, such as so-called forks or privacy coins. It also explains developments such as stablecoins or central bank digital currencies, which are potentially much more in line with bitcoin’s original idea of digital cash. Overall, the chapter provides a basic understanding of cryptocurrencies, their defining characteristics, challenges, and markets.

The authors consider a variety of cryptocurrency and equity risk factors as potential forces that drive cryptocurrency returns and carry risk premiums. In a cross-section of 2,000 biggest cryptocurrencies during 2014–2020, only downside market risk, cryptocurrency size and cryptocurrency policy uncertainty factors are systematically priced with significant premiums. Cryptocurrencies, which have greater exposures to these factors, yield higher returns subsequently. Equity market risk, particularly equity downside market risk, appears to be more important than cryptocurrency market risk, suggesting greater linkages between cryptocurrency and equity markets than we used to think. Global and the US equity factors are more relevant for the cryptocurrency market than local factors from other markets. However, there is no evidence that exposure to momentum, volatility and Fama–French factors is compensated by higher returns.

Purpose: This chapter aims to lay out the issues regarding the world of digital currencies, private and central bank digital currency (CBDC). In that connection, the authors want to, as much as possible, systematically present the terminology, examples of various digital currencies and the technology behind that phenomenon. The chapter also highlights the occurrence of CBDC and the possible implications of its introduction to day-to-day commercial banking practice, possibly taking the payment systems and transactions alternation, balance sheet and profits’ issues into consideration.

Need for the study: Digital currencies already have and are also soon going to have an enormous impact on society as such, where payments for everyday goods and services are taken on a whole new platform and level, in the sense of how the payments are made and payment systems are constructed, as also in the sense of quantity, as the number and sum-wise payments carried out via such platforms are growing.

Methodology: A triangulation method, a mixed qualitative methodological approach was implemented, so the research offers a synthesis of previously published contributions in this field, followed by deductive and inductive reasoning interconnected with descriptive and comparative analyses.

Findings: As digital currency already have a vast impact on payment systems and modes of payment, the CBDC, an imperative of today and not the matter of the future, will have implications for commercial banks, probably in the field of lowering banks’ commissions, no big customer data-selling ability, accumulating the deposits and deposit policies and credit policies due to higher funding costs for banks. There is an interwovenness among the central bank activities, bank customer’s behaviour and commercial bank activities. Therefore, the change of payment and spending behaviour of customers because of central banks’ introducing novelties will also have consequences for the banking industry.

Practical implications: The choice to handle cash or digital currency will be obsolete, and an individual’s or a firm’s financial knowledge must be upgraded in the field of new money using angles. The issue of digital currencies and CBDCs are no longer a matter of choice but are becoming a new reality. Therefore, it is necessary for the common public, economy and banking system, especially now carrying out most of payments and transfers of money, to study this field and foresee the possible consequences and risks emerging.

Cryptocurrencies are notoriously difficult to value from a fundamental perspective. This valuation challenge is rooted in various debated issues in academia and the investments industry. For example, do cryptocurrencies and other cryptoassets have intrinsic value in the conventional sense? Can one appropriately regard cryptocurrencies as digital fiat currencies? What distinguishes cryptocurrencies such as bitcoin and ether from precious metals like gold from a financial perspective? How do cryptocurrencies compare to other cryptoassets in terms of pricing and valuation? This chapter aims to provide responses to these questions, discuss approaches to cryptoasset valuation, and identify areas for future research.

Decentralization of finance is usually regarded as a revolution in just the field of finance. However, thanks to chain structures (e.g. blockchain) ranging from supply chain management to enterprise resource management systems, decentralization gradually reforms all aspects of global business simultaneously. Cryptocurrency markets and decentralization of network structures may be considered as two independent chaotic processes by an uninformed observer; however, almost every step of this transformation process can be associated with a certain innovative motivation which was designed for a specific purpose.

In this chapter, the implications of financial decentralization movements have been discussed with the assumption that the cryptocurrency market movements and relevant infrastructure improvements may be regarded as the end result of a chain of events which may be influenced by a number of decision-makers. The system components affecting the adoption process have been divided into four categories. Three potential scenarios have been presented for each category with an emphasis on their potential effects on the global business environment. Using intuitive logic, a pathway has been speculated for the adoption process for each component of decentralized finance. Topics discussed in this context should be regarded as pure speculation and should not be perceived as investment advices in any shape or form.

The chapter explains the Blockchain and its application in cryptocurrency and in various sectors. It gives an insight into the level of adoption of Blockchain technology globally based upon industry, country, and component. China is leading all nations worldwide, followed by the United States. The study will help to understand future research regarding its applications in different sectors of the economy. The study will also help to understand the significance and complications regarding risk and regulation. Its adoption in the logistics and supply chain is meant to achieve error-free communication and efficient tracking management.