Cryptocurrency for Beginners

How does crypto work, in one paragraph?

Here is how crypto works in a nutshell: instead of a bank keeping a private record of who owns what, thousands of computers keep a shared public record, and anyone holding the right private key can move the coins it controls.

That record is the blockchain. New transactions are bundled into blocks, checked by the network under agreed rules, and added to the chain in order. Once a block is buried under enough later blocks, rewriting it would take an impractical amount of computing power or staked value, so the record is treated as final. There is no customer service line and no reversing a payment, which is the strength and the danger of the whole system.

What is a blockchain actually storing?

A list of balances and transfers between addresses, not names.

An address is a long string of characters derived from a key. Anyone can see how much sits at an address and every transfer in or out, but not, directly, who owns it. That openness means you can check a transaction yourself on a block explorer. It also means a mistake is public and permanent: send to the wrong address and the network will not undo it.

Different blockchains have different rules. Bitcoin's network is secured by mining, where computers compete to add each block. Ethereum and many newer chains use staking, where validators lock up coins as a guarantee of good behaviour. Our Bitcoin answer explains mining and the fixed supply.

Coins, tokens and stablecoins: what is the difference?

• Coins are native to their own blockchain, such as bitcoin on Bitcoin or ether on Ethereum. They pay the network's fees.
• Tokens are created by programs that run on an existing blockchain. They can represent almost anything: a project's governance vote, an in-game item or a claim on another asset.
• Stablecoins are tokens designed to hold a fixed value, usually one US dollar. USDT, issued by Tether, is the most traded. Read what USDT is before relying on one.

Thousands of tokens exist, and most have little trading and little purpose. Being listed on a platform does not mean a token has been checked or has lasting value.

Who holds your crypto: you or the platform?

Whoever holds the private keys. On an exchange, that is normally the exchange.

A private key is the secret that authorises spending from an address. Wallet apps usually show it as a recovery phrase of 12 or 24 words. With a self-custody wallet, you keep that phrase; nobody can freeze your coins, but nobody can recover them either if you lose it or someone tricks you into revealing it. With a custodial account on a platform, the firm holds the keys and you hold a balance in its books, which is convenient but depends on the firm staying honest and solvent.

What does a crypto exchange do?

An exchange runs an order book for each pair, such as BTC/USDT, matches buy and sell orders, and holds customer balances. It usually requires identity checks before you can deposit bank money, and charges trading fees, often split into maker and taker rates, plus fees to withdraw coins. Many also offer riskier products such as futures and margin trading. Our guides on trading apps and fees go into the details, and ten checks before trusting a provider covers safety.

What are network fees, and why do they change?

Every blockchain transaction pays a fee to the network, and that fee rises when many people want to transact at once.

Blocks have limited space, so users effectively bid for a place in the next one. On Bitcoin and Ethereum, a transfer that costs little on a quiet weekend can cost much more during a market rush. Other networks, such as Tron, usually charge less. When you withdraw from a platform, it passes on the network fee and sometimes adds its own. For small amounts, a fixed withdrawal fee can take a large share, so check it before moving coins.

Why does the same coin have different prices?

Because every platform has its own order book, with its own buyers and sellers.

Websites and apps that show cryptocurrency prices live are either quoting one platform or averaging several, so two screens can disagree slightly at the same instant. As an illustration, if one venue shows Bitcoin at $64,210 and another at $64,260, the $50 gap is less than 0.08% of the price. Traders who buy on the cheaper venue and sell on the dearer one keep such gaps small. They widen in fast markets, on small platforms and for thinly traded tokens, and the price you actually pay also depends on the spread and how deep the order book is at that moment.

How volatile is crypto, really?

Very. Double-digit moves in a day are not rare for Bitcoin and are common for smaller tokens.

Losses also work against you asymmetrically. If a coin falls 50%, it must then rise 100% just to get back to where it started. A fall of 90%, which many tokens have suffered, needs a tenfold rise to recover. That is why position size, the amount you commit to any one coin, matters more than being right about direction. The crypto profit calculator shows how fees change the result of a trade.

What are staking and DeFi, briefly?

Staking means locking coins on a network that uses proof of stake, to help validate transactions in exchange for rewards. Platforms offer staking products, but your coins may be locked for a period and rewards are not guaranteed. DeFi, short for decentralised finance, covers lending, borrowing and trading run by programs on a blockchain rather than by a company. It removes the middleman but adds new risks: bugs in the code, hacks, and tokens that collapse. High advertised yields in either area are payment for risk, and sometimes a sign of something worse.

What rules apply to crypto?

Rules depend heavily on where you live. The EU now licenses crypto service providers under its MiCA regulation. The UK requires crypto firms to register for anti-money-laundering purposes and, since 2021, has banned the sale of crypto derivatives to retail consumers. Where crypto CFDs are allowed for retail clients in the EU and Australia, leverage is capped at 2:1. Many platforms operate from jurisdictions with far lighter rules, so the protections you get depend on which entity you actually sign up with, not on the brand name.

Is crypto the same as a digital version of cash?

Not quite. Cash and bank deposits are backed by a state or a regulated bank, and most bank deposits are covered by a guarantee scheme up to a limit. Most crypto-assets have no issuer standing behind them at all, and stablecoins are backed only by their issuer's reserves. Crypto can be used for payments, but its value comes from what other people will pay for it at any given moment.

What is a sensible order for learning?

1. Understand the difference between holding keys yourself and leaving coins on a platform.
2. Learn how USDT networks work before sending anything.
3. Add up the full cost of a round trip: fees, spread and withdrawal.
4. Read the scam warning signs, because crypto is where most investment fraud now happens.
5. Decide in advance how much you could lose without real harm, and stay below it.

Sources

• UK Financial Conduct Authority, ban on sale of crypto-derivatives to retail consumers (2021)
• Regulation (EU) 2023/1114 on markets in crypto-assets (MiCA)
• European Securities and Markets Authority, product intervention measures on CFDs