The process that adds new Bitcoin transactions to the distributed ledger known as the "blockchain." Mining is also how new coins come into existence as a reward for being the first miner to add the next block of transactions to the blockchain.
Like a gold mine, which takes work to produce results, Bitcoin mining performs "digital work" to bring coins into creation. Hence the mining metaphor. However, this digital processing uses an enormous amount of electricity worldwide. See
blockchain.
In the Bitcoin network, validator nodes check the format of new transactions, and mining nodes select them from the validators' memory pools to form a new block. The miner then competes with other miners to be first to solve a mathematical puzzle (see
cryptographic hash function). On average, a new block is added every 10 minutes, and each new block adds more confirmation of the previous transactions. See
mempool and
Bitcoin confirmation.
Miners Are Rewarded with Bitcoins
The mathematical puzzle takes a gigantic amount of calculations to solve and ensures that miners spend resources, thus providing "proof-of-work" (PoW). The first miner to solve the puzzle and publish the block to the blockchain is rewarded with the transaction fees and new bitcoins (see
crypto block reward). If two miners solve the puzzle at the exact same time, the miner that did the most computational work is the winner. The massive digital processing required also keeps fraudulent miners away. See
proof-of-work algorithm and
Bitcoin halving.
A decade ago, an ordinary PC could be used to mine Bitcoin and had a chance to win the reward. However, as more miners came on board with faster hardware, there was more competition and less chance of winning. Today, a regular PC might never solve the puzzle; however, they can still be used to mine other cryptos (see
pool mining).
Chinese Pools Were the Largest
Organizations create huge mining pools to accomplish the task using specialized "ASIC miner" hardware. Located in China where electricity is less expensive, pools mined roughly 65% of Bitcoin transactions worldwide. However, in 2021, China cracked down on Bitcoin trading and mining, and China-based miners began moving to Central Asia and North America. See
miner hardware and
cryptographic hash function.
The Maximum Number of Bitcoins Is 21 Million
The Bitcoin algorithm ensures that the number of new coins miners generate for their own accounts slows down over time (see
Bitcoin halving). At some point in 2140, the total number of coins will be capped at 21 million. Starting with 50 coins in 2009, the first four years generated 10 million coins, but the subsequent five years only six million more. After 2140, the only revenue miners will receive is from transaction fees. See
crypto block reward.
The Cap Is a Major Feature
Bitcoin proponents claim that the capped total of coins is what makes Bitcoin valid money, similar to having physical gold bars. Just like an ounce of gold, the market may change its daily value, but a devaluation cannot occur due to inflating the money supply. See
Bitcoin,
cryptojacking and
crypto glossary.
Mining Bitcoins in Fort Worth, Texas
In April 2022, mayor Mattie Parker explained on CNBC Business News how the city started out with three mining rigs to earn money mining bitcoins. After the Chinese cracked down on miners, politicians in the state claimed they wanted Texas to be the "Bitcoin mining capital" of the world, but problems with the electrical grid may foil that desire. (Image courtesy of CNBC Business News.)
CleanSpark Bitcoin Miner
A renewable energy company featuring residential and commercial solar systems, CleanSpark is one of the top U.S. miners with more than 30,000 mining rigs in Georgia and upstate New York. See
miner hardware.
(Images courtesy of CleanSpark.)