I was asked by a wealthy friend of mine, (after me suggesting he invest in bitcoin) to explain to him why he should invest in bitcoin? He believes that it is a scam while I am trying to explain that it is built on "trust". Then I found that I had a hard time explaining exactly what bitcoin is and how it works? I found that after months of researching I still could not give a clear answer. I would like to hear others explanation and or opinions on this matter.