Abstract :Crypto currencies have recently become one of the most controversial issues in the public opinion. One of the most fundamental reasons for this is that the fluctuations in the trading volume and prices of crypto currencies emerged in 2009 have increased visibly in recent years. Crypto currencies has many direct and indirect effects on the global monetary sys- tem and the world economy. At this point, as well as the factors that lead to the emergence of cryptic currencies, the change and transformation process that the world economy will bring about is also very important. The extent to which the functions of the classical cur- rencies of the crypto currencies can be fulfilled will have a direct impact on the diffusion process of the crypto currencies. The efficiency of governments’ economic direction and monetary policy will undergo change and transformation thanks to widespread use of cryp- to currencies. The aim of this study is to foresee the future of the global reserve money system with the emergence of crypto currencies and how the senyoraj income of the central banks will be affected from this process and the functions of the classical money of the crypto currencies. Keywords : Crypto Currency, Macroeconomics, Global Financial System, Monetary Policy, Policy Efficiency.
