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Current cryptocurrencies, starting with Bitcoin, build a decentralized blockchain-based transaction ledger, maintained through proofs-of-work that also serve to generate a monetary supply. Such decentralization has benefits, such as independence from national political control, but also significant limitations in terms of computational costs and scalability. We introduce RSCoin, a cryptocurrency framework in which central banks maintain complete control over the monetary supply, but rely on a distributed set of authorities, or mintettes, to prevent double-spending. While monetary policy is centralized, RSCoin still provides strong transparency and auditability guarantees. We demonstrate, both theoretically and experimentally, the benefits of a modest degree of centralization, such as the elimination of wasteful hashing and a scalable system for avoiding double-spending attacks.

Recently, cryptocurrencies and bitcoin have become the main topics in the financial industry. A cryptocurrency is a digital or virtual currency that uses cryptography for security. A cryptocurrency is difficult to counterfeit because of this security feature. A defining feature of a cryptocurrency, and arguably its most endearing allure, is its organic nature; it is not issued by any central authority, rendering it theoretically immune to government interference or manipulation. Cryptocurrencies have their benefits and drawbacks. The paper elaborates different aspects of cryptocurrencies, starting with their early development, challenges and risks, opportunities, advantages and disadvantages, and their future. In addition, the paper covered issues related to the practical and technical function of cryptocurrencies. It was concluded that is not easy to predict the future of cryptocurrencies, since there is a lot to be done especially in the field of formal regulations. However, the banks and other financial institutions should see and consider cryptocurrencies as an alternative for the financial transactions in the future.

In this article the author analyzes the perspectives of cryptocurrencies development in modern life and economy as a symbol of frontier economy and extremely new financial matter. A brief overview of electronic payments and virtual currency structure is given alongside with technical background. The emergence of electronic money and cryptocurrencies was an inevitable step in the evolution of Internet and electronic commerce. The author investigates the question how far cryptocurrencies might go in the nearest future as a symbol of frontier economy trends, keeping in mind that famous investors already buying cryptocurrencies, but governments are trying to ban this newly emerged threat to controlled money emission. The author therefore attempts to understand the phenomenon and explain why cryptocurrencies might undermine the existing financial systems.