What Is Mining, Explained Simply

Mining is how some networks decide who adds the next block, and how new coins enter circulation.

The competition

Miners repeatedly perform a calculation, varying an input, until they find one whose result meets a target set by the network.

There is no shortcut. The only method is to try, which means finding a solution requires doing a measurable amount of work. That is where the energy goes.

The first to find a solution publishes the block and collects new coins plus the fees of the transactions included.

Why the work is the point

The work is what makes rewriting history expensive.

To change an old transaction, an attacker would have to redo the work of every block since, faster than the rest of the network is adding new ones. On a large network that would cost more than any plausible gain.

So the energy is not wasted in the sense of producing nothing. It is purchasing tamper resistance, and whether that is a good trade is a legitimate argument that should be had on those terms.

The difficulty adjustment

The network adjusts the target so that blocks arrive at a steady rate regardless of how many miners are competing.

If more computing power joins, the target gets harder. If miners leave, it gets easier.

The consequence for miners is that adding capacity does not increase total rewards. It redistributes them, and the addition is competed away within one adjustment period.

The economics

A miner’s costs are electricity, hardware and financing. Their revenue is new coins plus fees, denominated in a volatile asset.

That combination means margins compress sharply when the price falls, which is why mining capacity consolidates after every downturn: the efficient survive and buy the assets of the inefficient.

The halving

On some networks the reward for each block halves at scheduled intervals. This reduces the rate of new supply and cuts miner revenue immediately.

Historically each halving has been followed by capacity consolidation and a period of adjustment.

What this means for you

Nothing directly. Mining is an industrial business and participating requires cheap electricity and specialist hardware.

Products offering mining returns to retail buyers, including cloud mining contracts, have a poor history and frequently amount to paying for exposure to an industry whose economics are worse than simply buying the asset.

If you want exposure to the asset, buy the asset, through a venue such as exchanges that support direct bank transfer, and hold it yourself. That is simpler, cheaper, and does not depend on someone else’s power contract.