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The prevalence of electronic money has affected the volume of banknotes and coins in circulation in Iran. This paper aims to study and analyses the mechanism of e-money impacts on currency volume. In this regard, the effects of e-money issuance and development indicators, such as number of debit cards, number of ATM machines, number of Point of Sales (POS) terminals, number of terminals in bank branches, on the volume of banknotes and coins in circulation are estimated using quarterly data during 2004-2010. The estimation results show that the increase in the number of debit cards raises the volume of currency in circulation. This arises since the debit cards are often used to get money for daily and weekly purchases from ATM machines in Iran. In addition, the number of Point of Sales has a negative effect on the volume of currency in circulation.  

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Virtual currencies are a new phenomenon that is extracted and transmitted over the Internet using new technologies. Decentralization, transboundary, anonymity of users, encryption and irreversibility of transactions are features that make the use of virtual currencies in criminal activity more attractive to criminals.
The uncertainty over the legal status of the central bank and its role in enforcing monetary and banking regulations will pose challenges to criminal proceedings related to virtual currencies; In the first place, the identification of virtual currencies that lack legal and central backing in the Iranian legal system as domestic and foreign currency and, secondly, the validity of the title of the foreign exchange for such transactions can be a source of ambiguity for the judicial system. To be considered. This paper uses descriptive-analytical methodology.
Precise legal definition of virtual currencies and determination of their legal nature, modification of laws related to virtual currencies and adoption of new laws taking into account the unique features of virtual currencies in cases where the law does not exist, recognizing criminal offences related to virtual currencies where it is not possible to comply with current laws, cooperating with foreign countries and international institutions in the exchange of information and communications related to virtual currencies, Agreement between the private and public sector on the use and application of virtual currency experts and the training of prosecutors and law enforcement officers are among the suggested solutions to address the challenges of dealing with virtual currency crimes.