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.

Altcoin is shorthand for "alternative coin" -- any cryptocurrency other than Bitcoin. The term is used loosely: some people apply it to every coin besides Bitcoin, others exclude Ethereum too since it has become a category of its own. Either way, it signals that a coin is being compared against the market's original reference point.

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.

ATH stands for "all-time high," the highest price an asset has ever reached. It is a simple historical marker, tracked from an asset's available trading history, and is commonly referenced in crypto discussion as a benchmark for how far a price currently is from its previous peak.

A bear market is a sustained period of falling prices, typically marked by pessimism, reduced trading activity from new buyers and, often, forced selling as leveraged positions unwind. As with a bull market, there is no single formal trigger; it is a descriptive term applied when a downtrend persists.

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 digital record that stores information in linked batches, called blocks, that are added in sequence and secured with cryptography. Once a block is confirmed and joined to the chain, changing it would require rewriting every block after it, which is what makes the record practically tamper-resistant. Copies of the chain are held across many independent computers (nodes), so no single party can rewrite history alone.

A bull market is a sustained period of rising prices across an asset or market, usually accompanied by growing optimism, higher trading volume and increased participation from new buyers. There is no single official threshold that defines when a bull market starts; it is a descriptive label applied in hindsight or based on general market conditions.

A centralized exchange, or CEX, is a company-operated platform that matches buyers and sellers, typically holding users' funds in custody on their behalf. Most large, well-known crypto trading platforms are centralized exchanges, offering fiat on-ramps, order books and customer support that decentralized alternatives generally do not.

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.

Cold storage refers to keeping a cryptocurrency wallet's private keys entirely offline, disconnected from the internet, to reduce exposure to remote hacking. Common forms include hardware wallets, which are dedicated devices that sign transactions without exposing the key to an internet-connected computer, and paper wallets, where keys are printed or written down.

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.

Cryptocurrency is digital money that exists as entries on a blockchain rather than as coins, notes, or a bank's internal database. Ownership is proven with cryptographic keys instead of a government-issued ID or account number, and transfers are validated by a decentralized network of computers rather than a single bank or payment processor.

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.

DeFi, short for decentralized finance, refers to financial applications, such as lending, borrowing, trading and earning yield, built on public blockchains using smart contracts instead of traditional intermediaries like banks or brokerages. Users typically interact directly with these protocols through a wallet rather than opening an account with a company.

A decentralized exchange, or DEX, lets users trade cryptocurrencies directly from their own wallets through smart contracts, without a company holding custody of the funds. Many DEXs use an automated market maker model, where trades execute against pooled liquidity provided by other users rather than being matched against a traditional order book.

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.

An exchange is a platform where people buy, sell and trade cryptocurrencies, either against other cryptocurrencies or against fiat currency. Exchanges can be centralized, meaning a company operates the platform and typically holds users' funds in custody, or decentralized, meaning trades settle directly between users' wallets through smart contracts with no custodial intermediary.

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).

Fiat currency is government-issued money, such as the US dollar, euro or yen, that is not backed by a physical commodity like gold but derives its value from government decree and public trust in the issuing authority. It is the traditional monetary system that cryptocurrency is most often compared and contrasted against.

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 cost paid to a blockchain network to process a transaction or execute a smart contract, most commonly associated with Ethereum and similar networks. The fee compensates the validators (or, historically, miners) who include the transaction in a block, and it typically rises when network demand is high and falls when the network is quiet.

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, built into some proof-of-work blockchains' code, that cuts the block reward paid to miners in half. Bitcoin's protocol triggers a halving roughly every four years (every 210,000 blocks), a mechanism designed to slow the rate at which new coins enter circulation over time until the maximum supply is reached.

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 cryptocurrency wallet that stays connected to the internet, such as a mobile app, browser extension or exchange account. It makes sending and receiving funds fast and convenient, which is why it is commonly used for smaller amounts and frequent transactions.

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 simply a record of transactions or balances. In traditional finance, a ledger might be kept privately by a bank; in cryptocurrency, a blockchain functions as a distributed ledger, meaning the record is replicated across many independent computers rather than held by one institution, with new entries added only when the network agrees on their validity.

Liquidity describes how easily an asset can be bought or sold at its current market price without moving that price significantly. A liquid market has many buyers and sellers active at once and tight spreads between bid and ask prices; an illiquid market has few participants, wider spreads, and prices that can swing sharply on a single large order.

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, or "market cap," is a coin's circulating supply multiplied by its current price. It is a simple way to size a cryptocurrency relative to others, similar to how the term is used for public companies, though crypto's circulating-supply figures can be harder to verify than a company's share count.

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 by which new transactions are verified and added to a proof-of-work blockchain, and new coins are issued as a reward. Miners compete using specialized hardware to solve a computationally difficult puzzle; the first to solve it gets to add the next block and collect the block reward and transaction fees.

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 piece of cryptographic data that proves ownership of a cryptocurrency address and authorizes spending from it. It is generated mathematically alongside a public key and, in most wallets, is represented to the user as a recoverable seed phrase rather than the raw key itself.

Proof of stake is a consensus mechanism where the right to validate transactions and add new blocks depends on how much cryptocurrency a participant (a validator) locks up, or "stakes," as collateral, rather than on computational work. Validators who act dishonestly can have part of their stake destroyed, a penalty known as slashing.

Proof of work is a consensus mechanism where network participants (miners) compete to solve a computationally intensive puzzle in order to add the next block to a blockchain. Solving the puzzle is deliberately difficult and resource-intensive, while verifying a solution is quick, which lets the rest of the network confirm a block was earned fairly.

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, sometimes called a recovery phrase or mnemonic phrase, is a sequence of typically 12 or 24 words generated by a wallet that can recreate all of that wallet's private keys. It is a human-readable backup of otherwise unreadable cryptographic data, designed so a wallet can be restored on a new device if the original is lost, damaged or stolen.

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 runs automatically when predetermined conditions are met, without needing a person or company to execute it manually. It can hold funds, enforce rules and interact with other contracts, all governed by code that is typically visible and, once deployed, difficult or impossible to change.

A stablecoin is a cryptocurrency designed to hold a steady value, usually pegged to a fiat currency like the US dollar. Issuers try to maintain the peg in different ways: holding reserves of cash and short-term assets, over-collateralizing with other crypto assets, or using algorithmic mechanisms to adjust supply. Not all approaches are equally robust, and pegs can and have broken under stress.

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 built on top of an existing blockchain, rather than one that has its own independent chain (a "coin," strictly speaking). Tokens are typically created using a standard, such as Ethereum's ERC-20 for fungible tokens, and can represent all kinds of things: a currency, a governance right, a claim on an asset, or access to a service.

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 is a blend of "token" and "economics," referring to the design of a cryptocurrency's supply, distribution and incentive structure: how many units exist or will ever exist, how new units are created or removed, who holds them, and what mechanisms encourage particular behavior from holders and users.

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. It is typically expressed as a statistical range or standard deviation, but in everyday use it just means how choppy or calm price action has been. Cryptocurrency markets have historically shown higher volatility than most traditional asset classes, though this varies a great deal by coin and by period.

A crypto wallet is software or hardware that stores the cryptographic keys needed to access and manage cryptocurrency on a blockchain. The wallet does not hold coins the way a physical wallet holds cash; the coins exist as entries on the blockchain, and the wallet holds the keys that prove ownership and authorize 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 market slang for an individual or entity holding a very large amount of a particular cryptocurrency, large enough that their buying or selling could noticeably affect that asset's price, especially in a less liquid market. The term is descriptive of size and potential market impact, not a formal category with a fixed threshold.

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.