why bitcoin mining difficulty is increased?
I just want to knows that why the bitcoin mining difficulty level is increased and i am afraid of the life of future miners.Maybe in future the miners electricity will cost more than our rewards because of the difficulty level.
I think it is caused due to the number of bitcoins have to be decreased day by day,so the rewards are also getting thinner.But we don't have to worry about the electricity because the price of bitcoin is keeps increasing.