Crypto Glossary A–Z — 50 Blockchain & Trading Terms

A public identifier used to receive cryptocurrency on a particular blockchain. Address formats vary by network, and some exchanges require a destination tag or memo.

Important: Before sending funds, confirm the network and recipient address; a mistaken transfer may be irreversible.

A distribution of tokens to eligible wallets, sometimes based on past activity, participation or a promotional campaign.

Important: Unexpected airdrop links may be phishing attempts; never reveal wallet recovery details.

A mechanism that uses smart contracts and pooled assets to quote and execute token swaps without a traditional order book.

Important: Pool depth, fees and the pricing formula affect the execution price.

A decentralized monetary network and its native digital asset. Bitcoin transactions are checked according to network consensus rules without relying on a single operator.

Important: Bitcoin prices are volatile; ownership and network participation are different concepts.

A collection of transactions and related data added to a blockchain under a network’s consensus rules.

Important: Block frequency and contents vary by blockchain.

A ledger maintained across a network in which blocks of records are cryptographically linked. Different designs offer different levels of openness, finality and control.

Important: A public blockchain is not automatically private or free from risk.

A system for moving value or messages between blockchain networks, often by locking assets and issuing representations or proving events across chains.

Important: Bridges introduce additional smart-contract, validator and custody risks.

A wallet arrangement that keeps private signing keys offline, commonly using a hardware device or offline signing setup.

Important: Cold storage can reduce online exposure but does not remove recovery-phrase and physical-security risks.

The process and rules through which network participants agree on valid transactions and the accepted state of a blockchain.

Important: Consensus designs differ in security assumptions and required resources.

A wallet service in which a third party controls the private keys or manages the assets on a user’s behalf.

Important: Users depend on the custodian’s access, solvency and security procedures.

An organization or coordination model that uses blockchain-based rules and often token-holder voting to make decisions.

Important: A DAO may still have concentrated voting power or traditional legal entities.

Financial activities such as trading and lending carried out through blockchain protocols and smart contracts rather than solely through conventional intermediaries.

Important: DeFi exposes users to code flaws, liquidity stress, governance changes and economic exploits.

A service or protocol that enables cryptocurrency trading through smart contracts or peer-to-peer arrangements, typically without a centralized operator holding every trade balance.

Important: Trading can still involve interface operators, fees, slippage and contract risk.

An investing approach that spreads purchases of an asset across regular intervals rather than placing the entire purchase at once.

Important: DCA changes the timing of purchases but does not guarantee a profit or prevent losses.

A common Ethereum token interface defining functions and events used by fungible tokens, such as transfers, approvals and balance checks.

Important: The ERC-20 standard does not establish whether a token is safe, reputable or redeemable.

The execution environment used by Ethereum to run smart-contract instructions; many other networks implement compatible environments.

Important: EVM compatibility does not mean different chains share liquidity, security or fees.

A transaction charge associated with executing operations on networks such as Ethereum. Gas measures computational work, while the fee depends on gas used and the applicable price.

Important: Failed smart-contract execution may still consume gas and incur fees.

A denomination of ether equal to one-billionth of an ETH, commonly used to express gas prices on Ethereum.

Important: Gwei is a unit of ETH rather than a separate cryptocurrency.

Bitcoin’s programmed reduction of the mining block subsidy by half every 210,000 blocks, approximately once every four years.

Important: A halving reduces new coin issuance; it does not guarantee a price increase.

A measure of how many hashing calculations proof-of-work miners perform per second, often used to describe network mining activity.

Important: High hash rate may raise attack costs but is not a direct measure of coin price or profitability.

A wallet whose signing keys are used on a device connected to the internet, such as a smartphone or browser wallet.

Important: Convenient for regular use, but exposed devices face phishing and malware risks.

The difference in value between providing assets to certain liquidity pools and simply holding the same assets, caused by relative price changes.

Important: Trading fees may offset this difference, but cannot be assumed to do so.

Identity-verification checks that certain financial service providers perform to meet legal and risk-management obligations.

Important: Requirements differ across jurisdictions and services.

A base blockchain network, such as Bitcoin or Ethereum, that processes transactions and maintains its own consensus and security rules.

Important: Performance, fees and decentralization differ by L1 design.

A protocol built to process activity more efficiently while relying, to varying degrees, on a base blockchain for settlement or security.

Important: Not every separately branded chain inherits the same security guarantees as its parent network.

A reserve of assets held by a protocol or smart contract to support swaps, lending or other decentralized financial operations.

Important: Low liquidity can produce price impact; depositors may face smart-contract and market risks.

The current price per unit multiplied by the circulating supply of an asset, commonly used to compare the reported size of cryptocurrencies.

Important: Market cap is not the amount of money invested or the cash available to buy or sell the asset.

A node’s collection of valid unconfirmed transactions awaiting inclusion in a block. Each node can have a slightly different view.

Important: A transaction appearing in a mempool is not yet confirmed on the blockchain.

A token that identifies an individual asset or record rather than functioning as one interchangeable unit among identical tokens.

Important: Owning an NFT does not automatically confer copyright, legal title or ongoing market value.

A computer or software instance participating in a blockchain network by relaying data, verifying transactions, or maintaining network state.

Important: A full-verification node has different responsibilities from a lightweight client.

A wallet where the user, rather than an external custodian, controls the private keys or signing authority.

Important: Users must protect their own backups; losing them can mean losing access to funds.

A system that supplies external data or computation results to smart contracts, for example market prices or event outcomes.

Important: Incorrect, delayed or manipulated oracle data can harm a protocol.

A secret cryptographic value used to authorize transactions or prove control over blockchain assets.

Important: Anyone who obtains a usable private key may be able to transfer the associated assets.

A consensus mechanism where validators commit or stake assets to participate in proposing and checking blocks under network-specific rules.

Important: Staking may involve slashing, lockups or centralization risks.

A consensus method in which participants perform computational work to produce blocks, making the accepted transaction history costly to rewrite.

Important: Energy use and mining economics depend on the network and equipment.

A scaling system that processes transactions away from a base chain and posts data and/or verification information back to it.

Important: Optimistic and zero-knowledge rollups use different mechanisms and withdrawal assumptions.

A deceptive project action in which insiders abruptly drain liquidity, misuse investor funds, or otherwise leave buyers with losses.

Important: Not every sharp price drop is a rug pull; accusations require evidence.

The smallest unit of bitcoin: one satoshi equals 0.00000001 BTC, and 100 million satoshis make one BTC.

Important: A satoshi is a unit of account, not a separate blockchain.

A sequence of words used by many wallets to recreate private keys and restore access to assets.

Important: Never type a seed phrase into a website or share it with support staff.

The difference between a trade’s expected price and the actual execution price, which can arise from price movement or market impact.

Important: A slippage tolerance setting does not eliminate all trading risks.

A program deployed to a blockchain that executes rules when transactions or other contracts invoke it.

Important: Smart contracts can contain vulnerabilities and cannot independently know off-chain facts.

A cryptoasset designed to track the value of another asset, commonly a national currency, using reserves, collateral or algorithmic mechanisms.

Important: A stablecoin can lose its peg; backing and redemption rights vary by issuer.

Committing eligible assets to help secure or operate a proof-of-stake network, sometimes through a validator or staking service.

Important: Advertised rewards are not guaranteed and may be offset by fees, slashing or token-price losses.

A digital unit recorded on a blockchain or similar ledger that can represent value, access rights, voting power, or another defined function.

Important: The existence of a token does not prove ownership of an underlying real-world asset.

Creating a digital representation of an asset or right on a ledger, potentially linking tokens to securities, cash claims or other instruments.

Important: Legal rights, custody and transfer restrictions depend on the issuer and governing rules.

A metric estimating the value of assets deposited in selected decentralized-finance applications or protocols.

Important: TVL methods differ and may double-count assets or move with token prices.

A spendable output from a previous Bitcoin transaction, used as an input when creating a new transaction.

Important: Bitcoin wallets typically manage sets of UTXOs rather than a single account balance.

A participant that checks transactions and may propose or attest to blocks according to a proof-of-stake network’s rules.

Important: Validator operations and penalties vary substantially between chains.

Software, hardware or a service used to view balances, create addresses and authorize blockchain transactions. A wallet commonly manages keys rather than literally storing coins.

Important: Confirm whether a wallet is custodial or non-custodial before relying on its recovery options.

A cryptographic proof that allows one party to demonstrate a statement is true without revealing all underlying information.

Important: The privacy and security benefits depend on the proof system and how an application uses it.