What Is Bitcoin Mining?

Bitcoin mining is the process that adds new transactions to Bitcoin's blockchain and secures the network. Miners compete to solve a computational puzzle; the winner adds the next block and receives newly issued bitcoin plus transaction fees.

That's the one-paragraph version. Here's what it actually means.

The mechanism

Bitcoin uses proof of work. Miners repeatedly hash a candidate block with different values, searching for an output below a target threshold. There's no shortcut, you find it by guessing, billions of times per second.

The first miner to find a valid solution broadcasts the block. Other nodes verify it instantly (checking is trivial; finding is hard) and build on it. That asymmetry is the whole security model: rewriting history would require redoing all that work faster than the network can extend it.

Roughly every ten minutes, a new block is added.

What miners earn

Two revenue streams:

Block subsidy, newly created bitcoin. This started at 50 BTC per block and halves roughly every four years. It's the mechanism by which Bitcoin's 21 million supply cap is enforced. See how halvings affect miners.

Transaction fees, paid by users to prioritise their transactions. As the subsidy shrinks toward zero, fees are designed to become the primary incentive.

Difficulty adjustment

Every 2,016 blocks (about two weeks), Bitcoin adjusts the puzzle difficulty so blocks keep arriving roughly every ten minutes regardless of how much hashpower joins or leaves.

This is elegant for the network and brutal for miners: if global hashrate doubles and yours stays constant, your revenue halves. You are competing for a fixed pool of rewards against a growing field.

This single fact drives most mining economics. Full explanation: difficulty explained.

Mining hardware

The hardware has evolved through four generations: CPUs (2009), GPUs (2010), FPGAs (briefly), and ASICs, application-specific chips that do nothing but hash Bitcoin, from about 2013 onward.

Modern ASICs are measured in terahashes per second (TH/s) and rated for efficiency in watts per terahash (W/TH). Efficiency matters more than raw speed, because electricity is the dominant operating cost. See TH/s explained.

Mining economics in one line

profit = (your share of network hashrate × block rewards × BTC price) − electricity − hardware − overheads

Every serious question about mining is a question about that equation. Is it profitable? Depends on the inputs. What's hashprice? A way of normalising the first half.

Four ways to get mining exposure

1. Home mining. Buy an ASIC, run it yourself. Viable only with cheap electricity, see the full cost comparison.

2. Hosted mining. Your hardware, someone else's facility and power contract.

3. Digital / tokenized mining. Buy tokenized hashrate; the operator runs everything. Low entry cost, no hardware. Our GoMining review examines the largest platform in this category.

4. Mining stocks. Buy shares in listed miners for regulated, liquid exposure.

The plain-English framing

Mining is a leveraged bet on Bitcoin's price with a decay function attached. Rising difficulty erodes your position; rising Bitcoin price offsets it. Whether the trade works depends on which moves faster.

That's not a reason to consider alternatives mining. It's a reason to understand what you're buying.

Taxes

Mining rewards are generally taxable as income when received, and again as capital gains when sold. See our Bitcoin mining tax guide.

FAQ

How long does it take to mine one Bitcoin? Wrong question. Miners earn fractional rewards continuously based on their share of network hashrate, very few mine a whole block.

Can I mine Bitcoin on my computer? Technically yes, practically no. Your machine's contribution against modern ASIC farms is effectively zero.

Is Bitcoin mining legal? Legal in most jurisdictions, restricted or banned in some. Check local law.

What happens when all bitcoin are mined? Around 2140, miners will be compensated by transaction fees alone.

How much electricity does mining use? Substantial at network level. Individual return depends entirely on your rate per kWh.