WHO gets to be a miner? Anybody, so long as you have really fast computers, a lot of electricity and a desire to solve puzzles. The transaction data in each batch is encrypted by a formula that can be unlocked only through trial-and-error guessing on a massive scale. The miners put large-scale computing power to work as they compete to be the first to solve it. If a miner’s answer is verified by others, the data is added to a linked chain of blocks of data and the miner is rewarded with newly issued Bitcoin.