There's a question hiding in everything you've read so far. The blockchain lesson said thousands of computers around the world keep the same record, check each other's work, and make cheating impractical. Fine — but who are these computers? Nobody runs the network, so nobody sends them a paycheck. Why would anyone burn electricity around the clock maintaining a stranger's money?

The answer is the cleverest part of the whole design: the network pays them itself, in new coins. That's where coins come from. Bitcoin wasn't distributed by a company; every bitcoin in existence was created as a reward to a computer that did work for the network. Once you see that, "mining" and "staking" stop being mysterious words — they're the two ways networks choose who gets to do the work and earn the reward.

Mining: proof of work

On Bitcoin, the right to add the next page of transactions to the record is decided by a competition. All the participating computers — miners — race to solve a brute-force numerical puzzle. There's no skill to it; it's pure trial and error, billions of guesses per second. Whoever finds the answer first gets to add the next block and collects the reward: newly created bitcoin, plus the fees from the transactions inside.

The puzzle isn't busywork — it's the security. To rewrite the record, an attacker wouldn't argue with the network; they'd have to out-guess it, which means out-spending more than half its combined computing power, continuously. The honest network's electricity bill is precisely what makes attacking it absurdly expensive. This system is called proof of work: you prove you spent real-world resources, and that proof is your ticket to participate.

Two details worth knowing. The reward shrinks on a schedule — Bitcoin's halves roughly every four years (the "halving" you'll hear about), which is how the supply curve bends toward its 21 million cap and where its scarcity actually comes from. And the energy use is real and large; defenders and critics argue about whether it's worth it, but anyone telling you it's negligible is selling something.

Staking: proof of stake

Proof of stake gets the same security from a different kind of cost. Instead of burning electricity, participants — called validators — lock up their own coins as collateral. The network picks who adds the next block roughly in proportion to how much they've staked, and pays them a reward for honest work. Cheat, or even just go offline at the wrong time, and the network destroys part of your locked coins — a penalty called slashing.

Same logic, different deposit: proof of work says "cheating costs more electricity than you can afford," proof of stake says "cheating costs you your own money." Ethereum ran on proof of work for years and switched to proof of stake in 2022, cutting its energy use by over 99% — which is the headline argument for staking. The honest counterargument: in proof of stake, those who own the most coins earn the most rewards, a rich-get-richer dynamic that critics argue concentrates power over time. Neither system is settled as "the right one"; they're different bets about which cost keeps people honest.

The part that concerns your wallet

You'll meet this topic in one practical place: exchanges and wallets offering "staking rewards" — advertised like an interest rate for parking your coins. Three honest notes before any "earn 5%" button looks free. The reward is paid in the coin itself, so a 5% yield on something that drops 40% is not a win. Staked coins are often locked for a period — you can't always sell when you want to. And when a platform stakes for you, you're adding counterparty risk on top: it's their validator, their slashing exposure, and their custody of your coins while it happens. Staking isn't a scam — it's how these networks function — but "passive income" framing skips every one of those sentences.

The takeaway

Coins come from the network paying its own maintainers. Proof of work auctions that job to whoever spends the most computing power; proof of stake assigns it to those who lock up the most coins and punishes dishonesty by taking them. Both convert a real cost into security — and the supply schedules they enforce are where crypto's famous scarcity is actually written. As for "earn rewards" buttons: now you know what's behind them, which is the only position to press one from.