It is very simple because I trade many time or withdraw many time and I get money in my bank so I think it is very simple I will give them bank proof that time they invest it. But I will tell him it is risky if they have extra money then join bitcoin or trade in it.
By showing them a prof that can make them believe in it like by showing them a cash and how i can make it and get it and if those persons are close of mine like my relatives,i will take them to go in cebuana with me if im done trading my bitcoin and if its already change into cash and i will show them if who is the sender of the money that i received and after showing them i will start discuss them on how to join in it and how bitcoin help me with my needs and for those persons that are not too close of mine like my neighbors i will just told them to try research a bitcoin so that they will have an idea about it and i will show them a receipt of my cash from cebuana so they can see that the bitcoin really is the sender to make them believe in it.