Abstract
The emergence of cryptocurrency in the modern world has radically changed the attitude of investors to many financial instruments and assets. Bitcoin managed to earn a lot of amazing capitals, and today many people are striving to get into this trend. An excellent solution for automating the workflow with small amounts of money has become an online exchanger. This article discusses a program developed by the authors for currency exchange, money conversion. The program created for this work uses MD5 hashing algorithm. The main purpose of this study is to implement a complete control of the financial activity of the foreign exchange bureau, as well as to provide electronic accounting of receipts and expenditures. The main advantage of this currency exchange program is that it helps limit the potential losses caused by currency fluctuations.