The technical revolution has reached its maximum level in this time, it was not limited to special domain without another؛ even included the money itself. In the first decade of the new millennium, intangible money appeared that came in a virtual image that were not known before! Rather, it is issued in a decentralized manner by individuals, and it was called Cryptocurrencies. With fundamental change in the global financial system, many problems raised, and the legal level was no exception. What is the legal status of these currencies? are the laws prepared to deal with them? What is the ruling on its transactions? This study came as part of this legal activity to provide a research benefit to those working in the law, as well as enlightening those who deal with them about their legal rulings. The study was divided into an introductory research and three chapters. The ي introductory research dealt with the stages of the historical development of money until the emergence of Cryptocurrencies, the first chapter took about the explanation of their concept along with the types and characteristics of these currencies. As for the second chapter dealt with talking about their legal nature. Finally, the third chapter discussed the provisions of cryptocurrencies according to the Omani Civil Transactions Law. The most important results of the study are that most types of cryptocurrency transactions do not comply with the provisions of the Omani Civil Transactions Law in terms of being based on uncertainty and grave ignorance, gambling and betting, or on usurious benefits. The most important recommendations of this study were the need to form the committee by national legislator concerned with preparing an integrated study on these currencies and discussing all their aspects in order to find appropriate legislative solutions for them.