Many people don't know about bitcoin till now though they are educated and well-informed. The first time I heard about the bitcoin was nearly in February 2017 when I was watching a film about hackers. I thought that the bitcoin is a currency that only the hackers use. I asked my friend who was a computer expert about it and he didn't know it. Then, by coincidence I found a film on Youtube about the bitcoin and I found it easy to make a wallet and earn some satoshis from different sites. Gradually, I started to learn about the other currencies, investment, mining and some useful sites. I quickly realized that it is a cryptocurrency that is useful to buy many things online and invest it, and it is being abused by hackers and criminals. It is a very wide field and I am still discovering new things every day. How did you know about it?