There are many cryptocurrency projects out there. We must try to understand that a cryptocurrency should have a basic purpose. This is one of the main reasons why so many people use cryptocurrencies and invest in many cryptocurrency projects in the first place. If a coin does not have a specific purpose, then the chances are that the coin is itself a scam coin. This was the case with many scam coins such as Onecoin. So, how to make passive income by investing in legitimate cryptocurrency projects?