I participated in a tech incubator in 2013 and the facility had several mining rigs in this utility closet running all day. That peaked my interest in the whole bitcoin thing. 
Probably 2012-2013, it is the time when there was a major amount of bitcoin users. Somewhere at the same time, I also began to act on the field cryptocurrency.Yes, you fellows, to quickly find prospects cryptocurrency. I learned of its existence recently from this forum. So now actively getting information on this topic