Crypto Jargon Glossary: 40+ Terms in Plain English

Crypto has more jargon than almost any subject, and a lot of it is used to make newcomers feel out of their depth. This glossary defines the terms you will actually run into, in plain English, with no assumed knowledge. It is meant as a reference to keep open while you read anything else — including our main guide to what cryptocurrency is. Skim it, search it, or read it through; either way, the point is that none of these ideas are as complicated as the vocabulary makes them sound.

The absolute basics

Start here — these are the words the rest depend on.

• Cryptocurrency — digital money recorded on a shared public ledger and run by a network rather than a bank.
• Blockchain — the shared, tamper-evident record of transactions that thousands of computers each keep a copy of.
• Coin — a cryptocurrency native to its own blockchain, such as bitcoin or ether.
• Token — a crypto asset built on top of an existing blockchain rather than having its own.
• Decentralised — held and run by many participants, with no single party in control.
• Fiat — ordinary government money, such as dollars, pounds or euros.

Wallets and keys

These terms are about ownership and control — the heart of wallets versus exchanges.

• Wallet — software or a device that holds your keys and lets you send and receive crypto; the coins stay on the blockchain.
• Private key — the secret that controls your crypto; whoever holds it controls the coins.
• Public address — the shareable 'account number' others send crypto to; safe to give out.
• Seed phrase (recovery phrase) — a list of words that backs up your wallet; anyone with it can take your crypto, so never share or type it into a website.
• Self-custody — holding your own keys, so no company controls your crypto.
• Custodial — when a company (like an exchange) holds the keys for you.
• Hot wallet — a wallet connected to the internet; convenient, more exposed. Cold wallet — kept offline; safer for larger amounts.

How crypto moves and is secured

The mechanics of how a blockchain works, in single lines.

• Transaction — a transfer of crypto recorded on the blockchain.
• Block — a batch of transactions added to the chain together. Confirmation — each new block on top that makes a transaction harder to reverse.
• Mining (proof of work) — securing a network by spending electricity to add blocks and earn rewards.
• Staking (proof of stake) — securing a network by locking up coins as a deposit you lose if you cheat.
• Gas — the fee paid to use a network like Ethereum; rises when the network is busy.
• Node — a computer that keeps a copy of the blockchain and helps run the network.

Types of crypto and projects

The main categories you will hear named.

• Stablecoin — a token designed to hold a steady value, usually one dollar.
• Altcoin — any cryptocurrency other than Bitcoin.
• NFT — a token representing ownership of a single unique item, such as digital art.
• Meme coin — a token created around a joke or trend, usually with no real use; often highly speculative and risky.
• DeFi — 'decentralised finance,' apps that offer lending, trading and more via smart contracts instead of banks.
• Smart contract — a program on a blockchain that runs automatically as written.

Markets, trading and slang

Words from the trading world and crypto culture — useful to recognise, not instructions to trade.

• Exchange — a platform to buy, sell and trade crypto. On-ramp / off-ramp — the way in and out between fiat and crypto.
• Market cap — a coin's price multiplied by how many exist; a rough measure of size.
• Volatility — how sharply a price swings; crypto's is extreme.
• HODL — to hold rather than sell (from a famous typo of 'hold').
• FOMO — 'fear of missing out,' the urge to buy because a price is rising; a classic cause of losses.
• Bull market / bear market — a sustained rise / fall in prices.
• Whale — someone holding a very large amount of a crypto, able to move its price.

Risk and scam words to know

Recognising these terms is part of staying safe; we go deeper in common crypto scams for beginners.

• Rug pull — when a project's creators take investors' money and vanish, leaving a worthless token.
• Pump and dump — inflating a coin's price with hype, then selling on the people who bought in.
• Phishing — fake sites, emails or messages that trick you into revealing your seed phrase or keys.
• Presale / airdrop — early token sales and giveaways; frequently used as bait by scams, so treat with heavy caution.
• Not your keys, not your coins — the reminder that crypto you do not control the keys to is not truly yours.

A few more you'll hear

Odds and ends that come up often enough to be worth a line each.

• Satoshi — the smallest unit of bitcoin; one bitcoin is 100 million satoshis, so you never have to buy a whole coin.
• Ledger (the technology) — another word for the blockchain record itself; not to be confused with wallet brand names.
• Liquidity — how easily an asset can be bought or sold without moving its price; thin liquidity makes small coins easy to manipulate.
• Layer 2 — a network built on top of a blockchain like Ethereum to make transactions faster and cheaper.
• Proof of reserves — a report meant to show an exchange actually holds the customer funds it claims to; useful, but not a full audit.
• KYC — 'know your customer,' the identity checks regulated exchanges must run before you can trade.

That is the core vocabulary. Knowing what the words mean is not the same as knowing whether to buy anything — it never is — and nothing in this glossary is financial advice. But being able to translate the jargon strips away most of crypto's false mystique, and makes it far easier to spot when someone is using complicated language to sell you something simple and risky.