Crypto Glossary
A comprehensive A-Z glossary of cryptocurrency, blockchain, and Web3 terms. Every definition explained simply.
A
AML
Anti-Money Laundering. A set of laws, regulations, and procedures designed to prevent criminals from disguising illegally obtained funds as legitimate income through cryptocurrency or traditional financial systems.
AMM
Automated Market Maker. A type of decentralized exchange protocol that uses mathematical formulas and liquidity pools to price assets and execute trades automatically, without requiring a traditional order book or counterparty.
APY
Annual Percentage Yield. The real rate of return on an investment over one year, including the effect of compound interest. In DeFi, APY reflects the annualized return from staking, lending, or liquidity provision.
ASIC
Application-Specific Integrated Circuit. A specialized computer chip designed specifically for mining cryptocurrency, offering significantly more power efficiency than general-purpose hardware.
Address
A unique string of letters and numbers that identifies a location on a blockchain where cryptocurrency can be sent or received. Similar to a bank account number, but publicly visible on the blockchain.
Airdrop
A distribution of cryptocurrency tokens or coins sent to wallet addresses, usually for free, as a marketing strategy or reward mechanism.
Altcoin
Any cryptocurrency other than Bitcoin. The term combines 'alternative' and 'coin' to describe the thousands of digital currencies that have launched since Bitcoin's creation.
Altseason
A period in the crypto market when alternative cryptocurrencies (altcoins) significantly outperform Bitcoin, often seeing rapid price increases. Typically follows a Bitcoin bull run when profits rotate into smaller assets.
B
Bear Market
A market condition characterized by falling prices, pessimism, and negative investor sentiment. Bear markets in crypto can see prices decline 50-90% from previous highs.
Bitcoin
The first and most well-known cryptocurrency, created in 2009 by the pseudonymous Satoshi Nakamoto. Bitcoin operates on a decentralized peer-to-peer network using blockchain technology.
Block
A collection of transaction data bundled together and added to the blockchain. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data — forming a chain.
Block Explorer
A public website or tool that allows anyone to view all transactions, blocks, wallet addresses, and activity on a blockchain in real time. The blockchain's public record made searchable.
Block Reward
The cryptocurrency awarded to a miner or validator for successfully adding a new block to the blockchain. Block rewards are how new coins enter circulation and how network security is incentivized.
Blockchain
A distributed, immutable digital ledger that records transactions across a network of computers. Each block contains a set of transactions and is cryptographically linked to the previous block.
Bridge
A protocol that enables the transfer of assets or data between two separate blockchain networks. Bridges are essential for moving cryptocurrency across ecosystems (e.g., from Ethereum to Solana).
Bull Market
A market condition characterized by rising prices, optimism, and positive investor sentiment. In crypto, bull markets often see dramatic price increases across many digital assets.
Burn
The intentional and permanent destruction of cryptocurrency tokens by sending them to an address no one controls (a 'burn address'). Used to reduce circulating supply and potentially increase scarcity.
C
CEX
Centralized Exchange. A cryptocurrency trading platform operated by a company that holds customer funds and matches buyers with sellers. Examples include Coinbase, Binance, and Kraken.
Cold Wallet
A cryptocurrency wallet that is not connected to the internet, providing enhanced security for storing digital assets. Hardware wallets and paper wallets are common forms of cold storage.
Collateral
Assets locked in a smart contract to secure a loan in DeFi. If the value of the collateral falls below a threshold, the protocol automatically liquidates it to repay the debt.
Confirmation
The number of blocks added to the blockchain after the block containing your transaction. More confirmations mean greater security and finality — your transaction is increasingly difficult to reverse.
Consensus
The mechanism by which a blockchain network agrees on the current state of the ledger. Consensus algorithms ensure all participants have the same version of the truth without requiring a central authority.
Consensus
The mechanism by which all participants in a distributed blockchain network agree on the valid state of the ledger. Consensus ensures every node holds an identical, accurate copy of the blockchain.
Cryptocurrency
A digital or virtual form of currency secured by cryptography and operating on decentralized blockchain networks. Unlike government-issued money, most cryptocurrencies are not controlled by any central authority.
Cryptography
The science of securing information through mathematical techniques. In cryptocurrency, cryptography protects transactions, proves ownership of funds through digital signatures, and secures wallet addresses.
Custodial
A wallet or service that holds and manages your private keys on your behalf. You access your funds through their platform, but they technically control the assets. Opposite of self-custody.
D
DAO
Decentralized Autonomous Organization. An organization governed by smart contracts and community voting rather than traditional management structures.
DEX
Decentralized Exchange. A cryptocurrency exchange that operates without a central authority, allowing users to trade directly from their wallets using smart contracts.
DeFi
Decentralized Finance. A broad category of financial applications built on blockchain networks that operate without traditional intermediaries like banks, brokers, or exchanges.
Decentralization
The distribution of control, data, and decision-making across many participants rather than a single central authority. In blockchain, decentralization means no single entity controls the network.
Decentralized
A system or network where control, data, and decision-making are distributed across many participants rather than concentrated in a single entity. Decentralization is a core principle of blockchain technology.
Digital Signature
A cryptographic proof attached to a transaction that verifies the transaction was authorized by the holder of the private key. Digital signatures prove ownership without revealing the private key itself.
Dollar-Cost Averaging
An investment strategy where a fixed dollar amount is invested at regular intervals regardless of price. This reduces the impact of volatility by averaging your purchase price over time.
dApp
Decentralized Application. A software application whose backend runs on a decentralized blockchain network rather than a centralized server. dApps use smart contracts to operate without a central operator.
E
ENS
Ethereum Name Service. A decentralized naming protocol built on Ethereum that lets users register human-readable names like 'alice.eth' instead of long wallet addresses.
ERC-20
A technical standard for creating fungible tokens on the Ethereum blockchain. ERC-20 defines a common set of rules that all Ethereum tokens must follow.
ERC-721
A technical standard on Ethereum for creating non-fungible tokens (NFTs). Each ERC-721 token is unique and cannot be exchanged one-for-one with another token of the same type.
Ethereum
A decentralized blockchain platform that enables smart contracts and decentralized applications (dApps). Ethereum's native cryptocurrency is Ether (ETH).
Exchange
A platform where users can buy, sell, and trade cryptocurrencies. Exchanges can be centralized (operated by a company, like Coinbase) or decentralized (operating via smart contracts, like Uniswap).
F
FOMO
Fear Of Missing Out. The anxiety that drives investors to buy an asset rapidly rising in price out of fear of being left behind, often at the worst possible time — near the top of a price move.
FUD
Fear, Uncertainty, and Doubt. Negative or misleading information spread about cryptocurrency — sometimes by media, competitors, or governments — that causes panic selling and price drops.
Fiat Currency
Government-issued currency that is not backed by a physical commodity like gold. Examples include the US Dollar, Canadian Dollar, Euro, and Japanese Yen.
Fork
A change to a blockchain's protocol. A soft fork is a backward-compatible upgrade. A hard fork creates two separate, incompatible chains — often resulting in a new cryptocurrency being created.
Fungible
Interchangeable. A fungible asset is identical and can be exchanged one-for-one with another unit of the same asset. One Bitcoin equals another Bitcoin. Contrast with non-fungible (unique) assets like NFTs.
G
Gas Fee
The fee paid to process and validate transactions on a blockchain network. On Ethereum, gas fees compensate validators for the computational resources required to execute transactions.
Gas Limit
The maximum amount of gas (computational units) a user is willing to spend on a transaction. Setting it too low causes the transaction to fail (and you still pay the gas used). Setting it too high uses more ETH if all gas is consumed.
Governance
The system by which decisions are made within a blockchain protocol or decentralized organization. Token holders typically vote on proposals that affect the protocol's future direction.
H
HODL
Originally a typo for 'hold', HODL became crypto slang for a long-term investment strategy of holding cryptocurrency through price volatility rather than trading in and out.
Halving
A programmed event in Bitcoin's code that cuts the block reward in half approximately every four years (every 210,000 blocks). Halvings reduce the rate of new Bitcoin supply, making Bitcoin progressively more scarce.
Hardware Wallet
A physical device that stores cryptocurrency private keys offline, disconnected from the internet. Hardware wallets are the most secure way to store significant amounts of cryptocurrency long-term.
Hash Rate
The total computational power being used to mine and process transactions on a Proof of Work blockchain. Measured in hashes per second.
Hot Wallet
A cryptocurrency wallet that is connected to the internet, providing convenient access for frequent transactions. Examples include mobile wallets, browser extensions, and exchange wallets.
I
IPFS
InterPlanetary File System. A decentralized, peer-to-peer file storage protocol that stores data across a distributed network instead of centralized servers. Often used to store NFT metadata and Web3 content.
Impermanent Loss
The temporary loss of value experienced by liquidity providers when the price of tokens in a pool changes relative to when they were deposited. If prices diverge significantly, LPs may have less value than if they had simply held the tokens.
Interoperability
The ability of different blockchain networks to communicate, share data, and transfer assets between each other seamlessly. A key challenge in the multi-chain future of crypto.
K
KYC
Know Your Customer. Identity verification procedures required by financial regulations. Centralized exchanges must verify users' identities through ID documents to comply with anti-money laundering laws.
KYC
Know Your Customer. A verification process required by cryptocurrency exchanges and financial institutions to confirm a user's identity before allowing them to trade or transact.
L
Layer 1
The base blockchain protocol itself — the foundational network layer. Bitcoin and Ethereum are Layer 1 blockchains. All other protocols built on top of them (like rollups) are Layer 2.
Layer 1
The base blockchain network that processes and finalizes transactions on its own. Layer 1 blockchains have their own consensus mechanism and native cryptocurrency.
Layer 2
A secondary framework built on top of a Layer 1 blockchain designed to improve scalability, speed, and reduce transaction costs while inheriting the security of the underlying chain.
Ledger
A record-keeping system that tracks all transactions. In blockchain, the ledger is distributed — thousands of computers hold identical copies — making it tamper-resistant and transparent.
Liquidation
The automatic sale of a borrower's collateral by a DeFi protocol when its value drops below the required minimum. Liquidation protects the protocol from bad debt but results in loss for the borrower.
Liquidity Pool
A collection of cryptocurrency funds locked in a smart contract that provides liquidity for decentralized exchanges. Users who contribute to liquidity pools earn fees from trades.
M
Mainnet
The live, production version of a blockchain where transactions have real value. Contrasted with a testnet, which is a sandbox environment using worthless test tokens for development and testing.
Market Cap
Market Capitalization. The total value of all units of a cryptocurrency in circulation, calculated as: Current Price × Circulating Supply. Used to compare the relative size of different cryptocurrencies.
Market Cap
Market Capitalization. The total value of a cryptocurrency, calculated by multiplying the current price by the total circulating supply of coins or tokens.
Mempool
Memory Pool. A holding area on each network node where unconfirmed transactions wait to be picked up by miners or validators and included in the next block. Higher-fee transactions are generally prioritized.
MetaMask
A popular browser extension and mobile app cryptocurrency wallet that enables users to interact with Ethereum and compatible blockchains. MetaMask is the most widely used gateway to DeFi and Web3 applications.
Mining
The process of using computational power to validate transactions and add new blocks to a Proof of Work blockchain. Miners are rewarded with newly created cryptocurrency and transaction fees.
Mnemonic Phrase
Another term for a seed phrase or recovery phrase — the 12 or 24 words that back up your cryptocurrency wallet. 'Mnemonic' refers to a memory aid, as these words are easier to write and recall than raw private keys.
Multi-Sig
Multi-Signature. A security configuration requiring multiple private key signatures to authorize a transaction. Common formats are 2-of-3 (two of three keys required) or 3-of-5.
N
NFT
Non-Fungible Token. A unique digital asset stored on a blockchain that represents ownership of a specific item such as digital art, music, collectibles, virtual real estate, or other media.
Network Fee
The fee paid to process and include a transaction on a blockchain network. On Bitcoin it's called a transaction fee; on Ethereum it's called a gas fee. Fees go to miners or validators.
Node
A computer that maintains a copy of the blockchain and participates in the network by validating and relaying transactions. Nodes ensure the network remains decentralized and secure.
Non-Custodial
A wallet or service where only the user holds and controls their private keys. The provider has no access to funds and cannot recover them if keys are lost.
O
On-Chain
Refers to any transaction, data, or activity that is recorded directly on the blockchain. On-chain actions are public, permanent, and verifiable by anyone.
Oracle
A service that provides real-world data (like price feeds, weather, or sports results) to smart contracts on a blockchain. Oracles bridge the gap between on-chain smart contracts and off-chain information.
P
Paper Wallet
A physical document containing a printed private key and wallet address. A form of cold storage because it's completely offline, but vulnerable to physical damage, loss, and theft.
Peer-to-Peer
A network architecture where participants interact directly with each other without a central authority or intermediary. Bitcoin was described as a 'peer-to-peer electronic cash system' in Satoshi Nakamoto's original whitepaper.
Phishing
A social engineering attack where scammers impersonate legitimate services to trick users into revealing private keys, seed phrases, or login credentials. The most common way people lose crypto.
Portfolio
The collection of all cryptocurrency assets held by an investor. Portfolio management involves allocating across different assets based on risk tolerance, goals, and market analysis.
Private Key
A secret cryptographic key that proves ownership of a blockchain address and authorizes transactions. Never shared with anyone. If someone obtains your private key, they have full control of your funds.
Proof of Stake
A consensus mechanism where validators are chosen to create new blocks based on the amount of cryptocurrency they have staked (locked) as collateral, rather than computational power.
Proof of Work
A consensus mechanism where miners compete to solve complex mathematical puzzles to validate transactions and add new blocks to the blockchain. The first miner to solve the puzzle earns the reward.
Public Key
A cryptographic key derived from the private key that can be safely shared publicly. Your wallet address is derived from your public key. Others use your public key/address to send you funds.
R
Recovery Phrase
Another name for seed phrase or mnemonic phrase — the 12 or 24 words that serve as the master backup of a cryptocurrency wallet. Used to restore access to a wallet on any compatible device.
Rollup
A Layer 2 scaling solution that processes and bundles multiple transactions off the main chain and submits a compressed proof to the base layer. Rollups inherit the security of the underlying blockchain while dramatically increasing throughput.
Rug Pull
A crypto scam where developers abandon a project and run away with investors' funds — typically after building hype, attracting investment, and then withdrawing liquidity or selling team tokens.
S
Satoshi
The smallest unit of Bitcoin, equal to 0.00000001 BTC (one hundred-millionth of a Bitcoin). Named after Bitcoin's pseudonymous creator, Satoshi Nakamoto. Also called 'sats'.
Scalability
A blockchain's ability to handle increasing transaction volumes without sacrificing speed, security, or decentralization. The 'Blockchain Trilemma' states you can only optimize for two of three: scalability, security, and decentralization.
Seed Phrase
A series of 12 or 24 words generated by a cryptocurrency wallet that serves as a master backup. Anyone with access to the seed phrase has complete control over the associated wallet and funds.
Self-Custody
The practice of holding your own cryptocurrency private keys rather than leaving assets on an exchange or third-party custodian. Self-custody means you have full ownership and responsibility for your crypto.
Slippage
The difference between the expected price of a trade and the actual price when the transaction executes. Occurs because blockchain transactions take time to confirm and prices can move, especially in low-liquidity markets.
Smart Contract
Self-executing code stored on a blockchain that automatically enforces the terms of an agreement when predefined conditions are met, without requiring intermediaries.
Smart Contract Audit
A security review of a smart contract's code by professional security researchers to identify vulnerabilities, bugs, or exploitable logic errors before deployment.
Solana
A high-performance Layer 1 blockchain known for fast transaction speeds (up to 65,000 TPS) and low fees. Solana uses a unique Proof of History consensus mechanism alongside Proof of Stake.
Stablecoin
A cryptocurrency designed to maintain a stable value by being pegged to a reserve asset, typically a fiat currency like the US Dollar. Common stablecoins include USDC, USDT, and DAI.
Staking
The process of locking cryptocurrency in a blockchain network to support operations like validating transactions. Stakers earn rewards in return for their contribution.
T
TVL
Total Value Locked. The total value of crypto assets deposited in a DeFi protocol's smart contracts. TVL is a key metric for evaluating the size, adoption, and health of DeFi platforms.
Testnet
A test version of a blockchain network used by developers to test applications and protocols without risking real money. Testnet tokens have no monetary value.
Token
A digital asset created on an existing blockchain platform. Unlike coins which have their own blockchain, tokens are built using smart contracts on networks like Ethereum.
Tokenomics
The economics of a cryptocurrency token, including its supply schedule, distribution, utility, incentive mechanisms, and governance structure.
Transaction
A record of the transfer of cryptocurrency from one address to another, broadcast to the network, validated by nodes or miners/validators, and permanently recorded on the blockchain.
Two-Factor Authentication
2FA. A security layer requiring two forms of verification to log in — typically something you know (password) plus something you have (authenticator app code or SMS). Protects exchange accounts from unauthorized access.
V
Validator
A participant in a Proof of Stake blockchain network that is responsible for verifying transactions, proposing new blocks, and maintaining the integrity of the blockchain.
Vesting
A schedule that locks tokens and releases them gradually over time, preventing team members, investors, or founders from selling all their tokens immediately after launch.
Volatility
The degree to which the price of an asset fluctuates over time. Crypto is considered a highly volatile asset class — prices can rise or fall 20–80% within days or weeks.
W
Wallet
Software or hardware that stores private keys and allows users to send, receive, and manage their cryptocurrency. Wallets don't actually store crypto — they store the keys that prove ownership.
Wallet Address
A unique identifier for a cryptocurrency wallet — a string of alphanumeric characters that represents a destination on the blockchain where funds can be sent. Similar to an email address for money.
Web3
The next evolution of the internet built on blockchain technology, emphasizing decentralization, user ownership of data and digital assets, and permissionless participation.
Web3
The next generation of the internet, built on blockchain technology. Web3 envisions a decentralized internet where users own their data, digital assets, and identities — contrasted with Web2 where platforms like Facebook and Google own user data.
Whitepaper
A detailed technical document published by a cryptocurrency project that explains the technology, vision, token economics, and use case of the protocol. Bitcoin's whitepaper, published in 2008 by Satoshi Nakamoto, is the most famous example.