How Bitcoin mining works

Bitcoin is one of the most popular types of cryptocurrencies, which are digital mediums of exchange that exist solely online. Bitcoin runs on a decentralized computer network or distributed ledger that tracks transactions in the cryptocurrency. When computers on the network verify and process transactions, new bitcoins are created, or mined. These networked computers, or miners, process the transaction in exchange for a payment in Bitcoin.
Bitcoin is powered by blockchain, which is the technology that powers many cryptocurrencies. A blockchain is a decentralized ledger of all the transactions across a network. Groups of approved transactions together form a block and are joined to create a chain. Think of it as a long public record that functions almost like a long running receipt. Bitcoin mining is the process of adding a block to the chain.

How Bitcoin mining works

In order to successfully add a block, Bitcoin miners compete to solve extremely complex math problems that require the use of expensive computers and enormous amounts of electricity. To complete the mining process, miners must be first to arrive at the correct or closest answer to the question. The process of guessing the correct number (hash) is known as proof of work. Miners guess the target hash by randomly making as many guesses as quickly as they can, which requires major computing power. The difficulty only increases as more miners join the network.
The computer hardware required is known as application-specific integrated circuits, or ASICs, and can cost up to $10,000. ASICs consume huge amounts of electricity, which has drawn criticism from environmental groups and limits the profitability of miners.
If a miner is able to successfully add a block to the blockchain, they will receive 6.25 bitcoins as a reward. The reward amount is cut in half roughly every four years, or every 210,000 blocks. As of September 2022, Bitcoin traded at around $20,000, making 6.25 bitcoins worth $125,000.

Is Bitcoin mining profitable?

It depends. Even if Bitcoin miners are successful, it’s not clear that their efforts will end up being profitable due to the high upfront costs of equipment and the ongoing electricity costs. The electricity for one ASIC can use the same amount of electricity as half a million PlayStation 3 devices, according to a 2019 report from the Congressional Research Service.