What Is Crypto Mining?

Crypto mining is the process of using powerful computers to verify cryptocurrency transactions and permanently record them on a blockchain, in exchange for newly created coins and transaction fees.

A blockchain is a shared digital ledger, a running list of every transaction, that thousands of computers around the world each keep an identical copy of.

Because no bank sits in the middle, the network needs a way to agree on which transactions are real and in what order they happened, and mining is that system.

Bitcoin is the largest cryptocurrency that still relies on mining, so it serves as the main example here.

Say you send 0.01 bitcoin to a friend.

Instead of passing through a bank, your payment waits in a public queue until a miner bundles it into a block, which is simply a batch of transactions, and adds that block to the chain.

Once the block is added, the payment is final and every copy of the ledger updates to show it.

How Does Crypto Mining Work?

On average, a new block is added to Bitcoin's blockchain about every 10 minutes, and miners around the world compete to be the one who adds it.

To win, a miner has to find a specific number that, when combined with the block's data and run through a scrambling formula called a hash function, produces a result below a target the network sets.

There is no shortcut to that number, so mining machines simply guess, over and over, trillions of times per second.

The first miner to land on a winning guess broadcasts the block, the rest of the network checks it almost instantly, and the winner collects the reward.

This system is called proof of work, because the winning number proves the miner spent real computing effort, and real electricity, to find it.

You will often hear that miners solve complex math problems, but that oversells it.

The puzzle works more like a lottery than an equation: each guess is a ticket, and more computing power just buys more tickets.

To keep blocks arriving about every 10 minutes, Bitcoin automatically resets the puzzle's difficulty every 2,016 blocks, or roughly every two weeks, making it harder when more machines join and easier when miners switch off.

Why Does Crypto Mining Matter?

Mining is what lets strangers trust a payment network that no company or government runs.

To rewrite past transactions, a cheater would need to out-guess every honest miner combined, which means controlling more than half of the network's computing power and paying for all the electricity that requires.

Mining also controls supply, because the only way new bitcoin enters circulation is as a reward to miners, on a schedule written into the code.

It can move the price, too.

Miners have real bills for power and equipment, so many sell some of the coins they earn, and when bitcoin trades below their costs, higher-cost miners are pushed to sell more or shut down.

That is why analysts track production-cost estimates so closely: bitcoin spent about 280 days below JPMorgan's estimate before briefly climbing above it in September 2026.

How Do Miners Get Paid?

The miner who wins a block receives two things: the block subsidy, a fixed number of brand-new bitcoin, and the fees users attached to the transactions inside the block.

Today the subsidy is 3.125 bitcoin per block, and with about 144 blocks found each day, the network creates roughly 450 new bitcoin daily.

That subsidy is cut in half roughly every four years in an event called the halving, and the most recent one, in April 2024, dropped it from 6.25 to 3.125 bitcoin.

The next halving is expected in 2028 and will cut the subsidy to 1.5625 bitcoin.

Because the reward keeps shrinking, no more than 21 million bitcoin will ever exist, and the final fraction of a coin is expected to be mined around the year 2140.

Under IRS guidance, mined coins count as taxable income at their fair market value on the day you receive them, and if mining is a business for you, that income can also be subject to self-employment tax.

If you later sell those coins, any rise in value after the day you received them is taxed separately as a capital gain.

Can You Mine Crypto at Home?

You can, but the math rarely works in your favor.

Virtually all bitcoin today is mined on ASICs, short for application-specific integrated circuits, which are machines built to mine one type of coin and nothing else.

Suppose you buy one that makes about 200 trillion guesses per second and draws 3.5 kilowatts of power around the clock.

With the whole network making roughly 950 quintillion guesses per second in late September 2026, your machine would account for about 1 in every 4.75 million guesses.

Your fair share of the 450 new bitcoin created each day would be about 0.0001 bitcoin, or around $8 with bitcoin near $83,000.

Running that machine uses 84 kilowatt-hours a day, and at the average U.S. residential electricity price of 18.2 cents per kilowatt-hour projected for 2026, the power bill comes to about $15 a day.

That leaves you losing roughly $7 a day, or about $2,700 a year, before you even count what the machine cost.

There is also a timing problem: mining alone, a machine with that share of the network would expect to win a block about once every 90 years.

That is why nearly every miner joins a mining pool, a group that combines its computing power and splits each reward according to how much each member contributed, which turns a long-shot lottery into a small, steady payout.

Large mining companies make the numbers work by buying power at industrial rates far below household prices and running tens of thousands of machines at once.

Mining Apps and Cloud Mining Are Not Free Money

A common belief is that you can earn crypto passively through a phone app or a cloud mining contract, where you rent computing power from a company.

A smartphone has nowhere near the computing power to compete with ASICs, so any app promising bitcoin mining income deserves deep skepticism.

Cloud mining has a long history of fraud.

In one case, the SEC charged the founder of GAW Miners with running a Ponzi scheme in which more than 10,000 investors paid for mining power that, for the most part, never existed.

Legitimate cloud mining contracts do exist, but they build in the provider's profit, run for a fixed term, and still leave you exposed to bitcoin's price.

Any offer that guarantees a daily return is a red flag, because real mining income rises and falls with bitcoin's price and the network's difficulty.

How Much Energy Does Crypto Mining Use?

The U.S. Energy Information Administration's preliminary 2024 estimate put crypto mining at 0.6% to 2.3% of all U.S. electricity use, comparable to the demand of somewhere between 3 million and 6 million homes.

The agency noted that miners chase the cheapest power they can find, including sites next to wind farms, while grid planners have raised concerns about how fast that demand has grown.

Not every cryptocurrency works this way.

Ethereum, the second-largest cryptocurrency, replaced mining with a system called proof of stake in September 2022, an upgrade known as the Merge that cut its energy use by an estimated 99.95%.

Under proof of stake, participants called validators lock up their own coins as collateral for the right to add blocks, so the network is secured by money at risk rather than by electricity burned.

Why Bitcoin Miners Are Turning to AI

With the 2024 halving shrinking rewards and bitcoin trading below estimated production costs for much of 2026, many publicly traded miners have looked for a second business.

Their answer has been artificial intelligence, because the power contracts, buildings, and cooling systems that run mining machines are exactly what AI data centers need.

Companies including IREN, Riot Platforms, and MARA Holdings have shifted capacity toward AI computing, though Benzinga reported in July 2026 that those stocks slid as the pivot ran into tougher competition and soaring equipment costs.

For Bitcoin itself, the shift is less dramatic than it sounds: when some miners leave, the difficulty adjustment makes the puzzle easier for those who remain, and blocks keep arriving about every 10 minutes.

Buying Crypto Instead of Mining It

For most beginners, owning bitcoin is far simpler than mining it, and you can buy a small fraction of a coin rather than a whole one.

Shares of publicly traded miners offer indirect exposure, though they add company risks like debt and rising costs on top of bitcoin's own price swings.

If you want to own the coins directly, Gemini lets you buy bitcoin and other cryptocurrencies with no machines to run or power bills to pay.

Bitcoin's price can swing hard in both directions: it fell from a record above $126,000 in October 2025 to about $62,500 by June 2026, which is why many beginners start with an amount they could afford to see cut in half.