The Words of Crypto

A crypto address is a string of letters and numbers that identifies a destination on a blockchain — the equivalent of an account number you share to receive funds.

An airdrop is a distribution of free tokens to many wallet addresses at once. Projects use airdrops to reward early users, decentralize ownership, or draw attention to a new token.

An all-time high (ATH) is the highest price an asset has ever traded at. It is a simple but closely watched reference point for how far a coin sits below — or above — its historical peak.

An all-time low (ATL) is the lowest price an asset has ever traded at. It is the mirror image of the all-time high and a common reference point for how far a coin has fallen — or recovered.

An altcoin is any cryptocurrency other than Bitcoin. The word is a contraction of "alternative coin" and covers everything from major smart-contract platforms to small, speculative tokens.

Annual percentage yield (APY) is the real rate of return earned on a deposit over a year, including the effect of compounding — that is, earning returns on your previously earned returns.

An ASIC (application-specific integrated circuit) is a chip designed to do one job extremely efficiently. In crypto, ASICs are machines built specifically to mine a particular proof-of-work coin.

A bear market is a prolonged period of falling prices and pessimistic sentiment. In crypto the term usually describes a sustained, broad decline rather than a brief dip.

Bitcoin is the first and largest cryptocurrency, launched in 2009. It is a decentralized digital money whose ledger is secured by a proof-of-work blockchain and maintained by a global network of nodes rather than any single company or state.

Bitcoin dominance is Bitcoin's share of the entire crypto market's value — its market capitalization divided by the market cap of all cryptocurrencies combined, shown as a percentage.

A block is a batch of transactions bundled together and added to a blockchain as one unit. Blocks are the "pages" of the ledger, added in sequence and linked to form the chain.

A block reward is the payment a miner or validator receives for successfully adding a new block to a blockchain. It is the main incentive that keeps a network secure.

A blockchain is a shared, append-only digital ledger that records transactions across a distributed network of computers. Once data is confirmed and bundled into a "block," that block is cryptographically linked to the one before it, forming a chain. Altering an old record would mean re-computing every block that followed it on a majority of the network at once, which is what makes the history tamper-resistant.

A bull market is a prolonged period of rising prices and optimistic sentiment. In crypto it describes a sustained, broad advance, often accompanied by rising trading activity and public interest.

Circulating supply is the number of coins or tokens that are publicly available and actively trading. It excludes tokens that are locked, reserved, or not yet released, and it is the figure used to calculate market capitalization.

A cold wallet is a way of storing the private keys that control your crypto entirely offline, so they are never exposed to an internet-connected device.

A consensus mechanism is the method a blockchain uses to let its distributed participants agree on a single valid version of the ledger without a central authority. It decides who can add the next block and how the network resolves disagreements.

A cryptocurrency is a digital asset that uses cryptography and a blockchain to record ownership and transfer value, without depending on a bank or government to issue it or keep the books.

A DAO (decentralized autonomous organization) is a group that coordinates and makes decisions through rules written into smart contracts, rather than through a traditional management hierarchy. Members typically hold governance tokens that grant voting power.

A DApp (decentralized application) is software whose core logic runs on a blockchain via smart contracts, rather than on servers controlled by one company.

Decentralization is the spreading of control and decision-making across many independent participants instead of concentrating it in one company, server or person. It is a core design goal of most cryptocurrencies.

Decentralized Finance, or DeFi, refers to financial services — lending, borrowing, trading, saving and derivatives — built on blockchains and run by smart contracts instead of banks or brokers. Users interact directly with the protocols from their own wallets.

A DEX (decentralized exchange) lets users trade cryptocurrencies directly from their own wallets through smart contracts, with no company holding their funds or matching their trades.

A distributed ledger is a record of data — such as transactions — that is shared and kept in sync across many independent computers, instead of living in a single central database.

ERC-20 is the technical standard that most fungible (interchangeable) tokens on Ethereum follow. It defines a common set of functions every compliant token implements.

Ethereum is a leading smart-contract platform, launched in 2015. Where Bitcoin focuses on being digital money, Ethereum is a programmable blockchain on which developers deploy smart contracts and decentralized applications.

A crypto exchange is a marketplace where users buy, sell and trade cryptocurrencies, either for other cryptocurrencies or for traditional money.

The Crypto Fear and Greed Index is a sentiment indicator that condenses the market's emotional state into a single number, typically from 0 (extreme fear) to 100 (extreme greed).

FOMO, short for "fear of missing out," is the emotional pressure to jump into an asset because it is rising fast and you are afraid of being left behind.

A fork is a divergence in a blockchain's rules or history. It happens when participants adopt different versions of the protocol, splitting the single agreed path into two.

A gas fee is the payment required to perform a transaction or execute a smart contract on a blockchain. It compensates validators or miners for the computing resources your action consumes and helps prevent the network from being spammed.

The genesis block is the first block ever created on a blockchain — block number zero. It is the root of the chain that every subsequent block links back to.

Gwei is a tiny unit of ether, Ethereum's native currency. One gwei is one-billionth of an ether, and it is the unit gas fees are usually quoted in.

A halving is a scheduled event that cuts a proof-of-work network's block reward in half, reducing the rate at which new coins are created. It is built into the protocol to enforce a predictable, decreasing supply schedule.

A hash is a fixed-length string of characters produced by running data through a cryptographic hash function. It acts as a unique digital fingerprint of that data.

HODL is crypto slang for holding onto an asset through ups and downs rather than trading in and out. It began as a misspelling of "hold" and is now often read as "hold on for dear life."

A hot wallet is a crypto wallet whose private keys are stored on an internet-connected device — a phone, browser extension or exchange account — making funds quick to access.

Immutable describes data that, once written to a blockchain and confirmed, cannot practically be altered or removed. The history is effectively permanent.

An initial coin offering (ICO) is a way for a crypto project to raise money by selling a newly created token to early supporters, often before the product is finished.

KYC, short for "Know Your Customer," is the process by which a regulated financial service verifies the identity of its users before letting them transact.

A Layer 2 is a network built on top of a base blockchain (the "Layer 1") to raise transaction throughput and cut fees, while still relying on the base chain for final security.

A ledger is a record of transactions and balances. In crypto it refers to the blockchain itself — the running history of every transaction the network has agreed on.

Liquidity is how easily an asset can be bought or sold without significantly moving its price. A highly liquid market has plenty of buyers and sellers close together, so trades fill quickly and near the quoted price.

A mainnet (main network) is the live, fully operational version of a blockchain, where transactions carry real economic value and are permanently recorded.

Market capitalization ("market cap") is the total value of a cryptocurrency, calculated by multiplying its current price by its circulating supply. It is the standard way to compare the relative size of different assets.

Maximum supply is the hard cap on how many units of a cryptocurrency can ever exist. Once that ceiling is reached, no new coins are created by the protocol.

The mempool (memory pool) is the holding area for transactions that have been broadcast to a network but not yet confirmed in a block. Each node keeps its own view of pending transactions.

Mining is the process of using computational work to validate transactions and add new blocks to a proof-of-work blockchain. Miners are rewarded with newly issued coins and transaction fees for the work they contribute.

An NFT (non-fungible token) is a unique blockchain token that represents ownership of a specific item. Unlike a cryptocurrency, where every unit is interchangeable, each NFT is one of a kind and cannot be swapped one-for-one with another.

A node is a computer running a blockchain's software, participating in the network by storing the ledger, relaying data and checking that transactions and blocks follow the rules.

A nonce ("number used once") is a value that is varied to produce a different cryptographic result. In proof-of-work mining it is the number miners repeatedly change while searching for a valid block.

An oracle is a service that delivers external, real-world data to a blockchain so that smart contracts can react to information they cannot read on their own, such as asset prices, weather or sports results.

An order book is a live, organised list of all the outstanding buy and sell orders for an asset on an exchange, arranged by price.

Peer-to-peer (P2P) describes a network in which participants — "peers" — connect and transact directly with each other, rather than routing everything through a central server or intermediary.

A private key is a secret, randomly generated number that authorises spending from a crypto address. Whoever holds the private key controls the funds, so protecting it is the single most important part of self-custody.

Proof of Stake is a consensus mechanism in which validators are selected to propose and confirm blocks based on the amount of cryptocurrency they lock up, or "stake," as collateral rather than on computing power.

Proof of Work is a consensus mechanism in which participants, called miners, compete to solve a computationally difficult puzzle. The first to find a valid solution earns the right to add the next block of transactions to the blockchain and collects the associated block reward.

A public key is a cryptographic value derived from a private key. It can be shared freely and is used to receive funds and to let others verify that a transaction was genuinely signed by the matching private key.

Return on investment (ROI) is a simple measure of how much an investment has gained or lost, expressed as a percentage of the amount originally put in.

A rug pull is a type of crypto scam in which the people behind a project suddenly withdraw its funds and disappear, leaving investors with worthless or untradeable tokens.

A satoshi is the smallest divisible unit of bitcoin. One bitcoin equals 100 million satoshis, so a satoshi is 0.00000001 BTC.

A seed phrase (also called a recovery or mnemonic phrase) is an ordered list of words — usually 12 or 24 — that acts as the master backup for a wallet. From this single phrase, the wallet can regenerate every private key and address it controls.

Slippage is the gap between the price you expect when you place a trade and the price you actually get when it executes. It can work for or against you, but usually matters most when it costs you.

A smart contract is a program stored on a blockchain that executes automatically when its predefined conditions are met. Because the code and its results live on the chain, the outcome is enforced by the network rather than by a bank, broker or court.

A stablecoin is a cryptocurrency designed to hold a steady value, usually by pegging to a fiat currency such as the US dollar. Stablecoins give traders and users a way to hold value on-chain without the price swings of assets like Bitcoin.

Staking is locking up cryptocurrency to help operate and secure a proof-of-stake network. In return for putting capital at risk and behaving honestly, stakers earn rewards, typically paid in the same token.

A testnet (test network) is a parallel version of a blockchain used for development and testing. Its coins are free and carry no real value, so mistakes are harmless.

A token is a digital asset created and managed by a smart contract on an existing blockchain, rather than by its own dedicated network. Tokens rely on the host chain for security and settlement.

A token burn is the permanent removal of tokens from circulation. The tokens are sent to a special address that no one holds the keys to, so they can never be spent again.

Tokenomics — a blend of "token" and "economics" — is the study of how a cryptocurrency's supply, distribution and incentives are designed. It is central to judging whether a token has durable demand or is likely to face selling pressure.

Total value locked (TVL) is the combined value of all assets currently deposited in a DeFi protocol — or across the whole DeFi sector. It is the most common gauge of how much capital a protocol has attracted.

Trading volume is the total quantity of an asset bought and sold over a set period, such as 24 hours. It measures how much activity and interest there is in a market.

A utility token is a token whose main purpose is to be used within a specific platform — to pay for, access or unlock its services — rather than to represent an ownership stake.

A validator is a participant in a proof-of-stake blockchain responsible for checking transactions and helping add new blocks. Validators are the proof-of-stake equivalent of miners.

Volatility measures how much and how quickly an asset's price moves over a given period. High volatility means large, rapid swings in either direction; low volatility means steadier prices. Cryptocurrencies are known for being more volatile than most traditional assets.

A crypto wallet is a tool that stores the private keys needed to access and move cryptocurrency. The coins themselves never leave the blockchain; the wallet holds the keys that prove ownership and let you sign transactions.

Web3 describes a vision of the internet built on blockchains, in which users own their identity, data and assets directly rather than entrusting them to centralized platforms. It is often contrasted with "Web2," the era of large platform companies.

A whale is a holder of a very large amount of a cryptocurrency — enough that their trades can move the market or sway sentiment. The term reflects size, not any official status.

Yield farming is the practice of putting crypto assets to work across DeFi protocols — and often moving them around — to earn the best available return, typically from a mix of interest, fees and token rewards.

A zero-knowledge proof is a cryptographic method that lets one party prove to another that a statement is true without revealing anything beyond the fact that it is true.