I advise you to pay special attention to the parameters of user and staff protection when developing your application, namely, two-factor authentication. After all, today's market requires reliability, especially in the world of cryptocurrency, and 2FA service can help in this as never before. Every year, the 2fa platform should improve and take a leading position, in this regard, Google has succeeded very well with its security algorithms. Today, two factor authentication solutions acts as a universal method for generating one-time passwords using certain security tokens. This raises the issue of multi-factor authentication solution to a new level, because it is important to have a different security architecture. Universality-this is the main criterion. if you consider the example of On-Premise 2FA Platform with the use of a protection layer and its accompanying tokens, you can achieve a new level of security for your service, which is not a little important in working with cryptocurrencies and especially in providing services.