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.
Difficulty level is increasing because of the number of miners and mining equipment that are solving the blocks. Since the rate of the blocks is 10 mins per block if more miners are mining at the same time then they are going to compete with each other for that same block. If the blocks are solved slower then the next difficulty might go low.
Since the price of bitcoin keeps on going high then mining would still be profitable for now because the increase can compensate the increase in difficulty level.