I just got this question in my mind. What will happen if no one knows about the pasword of his/her acount will it posibly deduct to the main supply of bitcoin? Example bitcoin was 21million supply and one man got 1 million bitcoin he was holding and suddenly he died no one can open his wallet is it posible that the remaining 20 million bitcoin forever?
It depends if the owner will pass it to their friends or relatives. If their friends or relatives will continue to use and earn bitcoin using the owner's account, the bitcoin of the owner will continue to grow. But if the owner does not pass their accounts to someone, I think their bitcoin will just stay and will not disappear.