A glossary of fifty crypto terms — and the eight that get misused most
Most crypto glossaries define words. This one explains the fifty terms an editor actually needs to read a market story — and flags the eight that get used wrongly often enough to start arguments.
Every newsroom that covers crypto eventually writes its own glossary. The first version is always too long, the second is always too short, and the third is the one the editors actually use. This is roughly that third version. Fifty terms, defined plainly enough to read a market story without getting tripped up, plus a short opinion section on the eight terms that get misused often enough to start arguments — sometimes on Twitter, sometimes in court filings, occasionally in earnings calls. The list is opinionated about which definitions matter and which are decorative, because the alternative is the kind of glossary that defines “wallet” as “a place where you store your crypto” and helps nobody.
The structure: a single table with all fifty, ordered roughly by topic — consensus, then DeFi, then L2s, then MEV, then tokens, then governance. After the table, a short discussion of the eight terms that journalists, lawyers, and crypto natives consistently use in different ways. If you are an editor: bookmark the table and read the second half. If you are new to the space: read the table first and come back when something in a headline confuses you.
Why most crypto glossaries fail
The two failure modes are over-definition and under-definition. Over-definition is when a glossary turns every term into a paragraph; you cannot scan it, and by the time you have read the definition you have forgotten the original sentence. Under-definition is when terms are reduced to their dictionary translation without the bit that actually matters — defining “slashing” as “a penalty for misbehaving validators” tells you nothing about whether the penalty is 1 ETH, 1% of bond, or the entire bond. The version that works for a newsroom sits in the middle: one sentence each, with the specific number or named protocol that makes the definition useful in context.
The other failure mode is decorative inclusion. Glossaries that include “blockchain” and “cryptocurrency” as entries are not for readers; they are for SEO. This list assumes you know what a blockchain is and starts at the level of detail that you actually need to read a story about, say, an L2 sequencer fault or an EigenLayer AVS slashing.
The fifty terms
| Term | Definition |
|---|---|
| Slot | The 12-second interval during which one Ethereum block is proposed. There are 7,200 slots per day. |
| Epoch | 32 slots, or 6 minutes 24 seconds. Validators are reassigned to committees at epoch boundaries. |
| Validator | A 32-ETH-bonded entity that proposes and attests to Ethereum blocks. Roughly 1 million active at end-Q1 2026. |
| Committee | A pseudo-random subset of validators assigned per slot to attest to that block. |
| Finality | The point at which a block cannot be reverted without slashing one-third of stake. Achieved 2 epochs after attestation. |
| Fork choice rule | The algorithm validators use to pick the canonical chain when forks exist. Ethereum uses LMD-GHOST plus Casper FFG. |
| Reorg | When the canonical chain switches to a different fork, invalidating recently-confirmed blocks. Common at depth 1; rare at depth 2+. |
| Slashing | The protocol-enforced burn of part of a validator’s bond for double-signing or surround voting. Minimum 1 ETH, scales with correlation. |
| MEV | Maximal extractable value — revenue a block producer can capture by ordering transactions advantageously. |
| MEV-Boost | Open-source middleware that lets validators outsource block-building to a market of specialised builders via trusted relays. |
| Bribes | Payments from searchers to builders, or from builders to proposers, to include a specific bundle. Functionally a tip. |
| Mempool | The pending-transaction pool seen by network nodes. Can be public (default) or private (Flashbots Protect, MEV Blocker). |
| Base fee | The per-gas fee burned on every Ethereum transaction since EIP-1559, adjusted block-by-block by demand. |
| Priority fee | The per-gas tip paid to the proposer above the base fee. Also called the miner tip, historically. |
| Gas price | Base fee plus priority fee, in gwei. The number a wallet quotes you. |
| Gwei | One billionth of an ether. The standard unit for gas pricing. |
| Nonce | Per-account counter that orders transactions from a single address. Transactions with the same nonce can replace each other if the fee is higher. |
| Calldata | Transaction input data stored on L1. Historically used by rollups to post compressed transaction data before EIP-4844. |
| Blob | A separate 128KB data type introduced by EIP-4844, priced on its own fee market and pruned after ~18 days. |
| EIP-4844 | The Dencun upgrade (March 2024) that introduced blob transactions. Cut rollup costs by ~90% overnight. |
| Proto-danksharding | The informal name for EIP-4844, distinguishing it from full Danksharding which expands blob throughput later. |
| Rollup | An L2 that posts data and state commitments to L1, inheriting L1 settlement and data availability. |
| Optimistic rollup | A rollup that assumes blocks are valid and relies on a fraud-proof window (typically 7 days) for security. |
| ZK rollup | A rollup that posts a cryptographic validity proof with each batch, removing the need for a fraud-proof window. |
| Validity proof | A SNARK or STARK proving that a state transition was computed correctly. Used by ZK rollups. |
| Fraud proof | An interactive game in which a challenger demonstrates that a proposed state root is incorrect. Used by optimistic rollups. |
| Sequencer | The L2 component that orders and batches transactions before posting to L1. Currently centralised on all major L2s. |
| Censorship resistance | The property that no single party can prevent a valid transaction from being included. Strong on L1, weaker on L2s with single sequencers. |
| Bridge | A contract or protocol that moves tokens between chains. Canonical bridges are run by the L2 team; third-party bridges are independent. |
| Wrapped token | A 1:1 representation of an asset on a different chain, backed by the original locked in a bridge contract. |
| Sidechain | A chain with its own validator set and security model, not inheriting L1 security. Polygon PoS and BNB Chain are sidechains, not rollups. |
| TVL | Total value locked — the dollar value of assets deposited in a protocol. The most-quoted and most-gameable metric in DeFi. |
| AMM | Automated market maker — a DEX that uses a deterministic pricing curve (e.g. constant product) instead of an order book. |
| Slippage | The difference between expected and executed price on a trade. Caused by price impact, AMM curve, or sandwich attacks. |
| Impermanent loss | The opportunity cost an LP suffers when pool prices diverge from external markets. Becomes permanent on withdrawal. |
| LP token | A receipt token representing a share of an AMM’s liquidity pool. Can be staked, lent, or used as collateral. |
| Yield farming | Strategies that move capital between protocols to capture token incentives. Often layered: stake, restake, borrow, repeat. |
| Liquidation | The forced sale of collateral in a lending protocol when the borrower’s health factor drops below 1. Liquidators earn a bonus. |
| Funding rate | The periodic payment between long and short holders on a perpetual futures contract, keeping the perp price tethered to spot. |
| Perp | Perpetual futures — a derivatives contract with no expiry, kept anchored to spot by the funding rate. Dominant crypto derivative. |
| ERC-20 | The Ethereum standard interface for fungible tokens. Defines transfer, approve, balanceOf, etc. |
| ERC-721 | The Ethereum standard for non-fungible tokens. Each token has a unique tokenId. |
| Smart contract wallet | A wallet whose logic is a smart contract, not an EOA. Enables features like batched transactions, social recovery, and gas sponsorship. |
| Account abstraction | The general design pattern allowing custom verification logic per account. Implemented via ERC-4337 and, more recently, EIP-7702. |
| EIP-7702 | An upgrade activated in Pectra (2025) that lets EOAs temporarily delegate to smart contract code, bringing AA features to existing addresses. |
| Stablecoin | A token designed to track a reference price, usually $1. Fiat-backed (USDC, USDT), crypto-backed (DAI), or algorithmic (mostly failed). |
| CBDC | Central bank digital currency — a digital liability of a central bank, distinct from a stablecoin. Few are live; many are piloted. |
| Bonding curve | A pricing function that sets the buy/sell price as a function of token supply. Used by some token launches and AMMs. |
| Vesting | The schedule on which locked tokens become transferable. Linear, cliff, or milestone-based. |
| Tokenomics | The economic design of a token — supply schedule, distribution, sinks, and incentives. The most-overused word in the lexicon. |
| Whitepaper | The original Satoshi-style document describing a protocol. Now typically replaced by docs sites and litepapers. |
The eight that get misused most
A definition is one thing; a usage convention is another. Below are the eight terms from the list above whose technical definition and journalistic usage have drifted far enough apart to cause real confusion. If you are writing or editing crypto copy, these are worth being precise about.
1. TVL
Total value locked sounds like a balance sheet figure, but it is closer to a marketing number than an audited liability. TVL counts the dollar value of assets deposited in a protocol at current prices, which means it moves with token prices independent of any user action. Double-counting is rampant: an ETH deposited in Lido, restaked via EigenLayer, and used as collateral on Aave counts in all three TVL figures. DeFiLlama publishes both gross and de-duplicated figures; use the latter for comparisons. Our market dashboard uses the de-duplicated series by default.
2. Decentralised
The word does too much work. A chain can be decentralised in validator set, sequencer set, upgrade key, foundation governance, and operating company — and most chains score well on only some of these. The L2Beat stage classification is the closest thing the industry has to an honest rubric, and the client diversity tracker covers the other half of the picture. Avoid the unqualified adjective; pick the dimension you mean.
3. Staking
Staking on Ethereum means posting a 32 ETH bond to run a validator. Staking on Coinbase or Lido is a custodial or pooled wrapper around that. Staking on a memecoin is usually a lock-up with a token incentive and no consensus role. The three are not the same product, and conflating them is the most common reason regulators and journalists talk past each other.
4. Layer 2
An L2 is a rollup that posts data and state roots to L1. A chain that runs its own validator set with no recourse to L1 is a sidechain, even if it markets itself as an L2. Polygon PoS is not an L2 in any meaningful technical sense; Polygon zkEVM is. The branding has drifted; the engineering distinction matters. The Ethereum Foundation’s scaling page remains the cleanest reference on the taxonomy.
5. MEV
MEV is often used as a synonym for “predatory ordering,” but it includes both extractive practices (sandwich attacks, JIT liquidity) and constructive ones (arbitrage, liquidations). Quoting an aggregate MEV figure without breaking out which categories it includes is roughly as useful as quoting “trading volume” without distinguishing wash trades from real flow. EigenPhi and Flashbots both publish category-level breakdowns; use those, not the aggregate.
6. Validator
On Ethereum, a validator is a 32 ETH bond with an associated key, not a person or a server. One operator might run hundreds of validators. When a press release says “we now have 100,000 validators,” it usually means 100,000 bonds, which could be run by a handful of operators in a few data centres. Always ask for the number of distinct node operators.
7. Wallet
A wallet is an interface to a private key. The private key is the asset. Software wallets (Metamask, Rabby), hardware wallets (Ledger, Trezor), smart contract wallets (Safe, Argent), and exchange accounts (Coinbase, Binance) all get called “wallets” but offer fundamentally different security models. The exchange account is custodial — you do not hold the key. The others are non-custodial in different shapes. The word obscures the distinction that matters most, and our wallet comparison tool breaks down the security model of each.
8. Smart contract
A smart contract is neither smart nor a contract. It is bytecode deployed at an address that executes deterministically when called. It cannot enforce off-chain obligations, it cannot adapt to circumstances, and it cannot be sued. The mismatch between the marketing word and the technical reality is the source of a remarkable amount of regulatory confusion. The Ethereum Foundation’s own docs are blunt about this.
How to use this glossary
Keep the table somewhere you can search it — a bookmark, a Notion page, a printed sheet stuck to the side of the monitor. When a term comes up in a story and you are not sure of the precise definition, look it up before you publish. Most newsroom mistakes in crypto coverage are not made by people who do not understand the space; they are made by people who understand it well enough to write fluently and then use a term in the way they remember rather than the way it is currently defined. The space moves; the definitions drift; the table needs occasional updates.
Specifically, three categories of definition in this list will need refreshing within the next 12-18 months. Anything tied to a specific EIP — EIP-7702, EIP-4844 — will gain neighbours as the Ethereum roadmap moves through Fusaka and beyond. Anything tied to an L2 stage classification will move as Stage 2 chains finally appear. And anything tied to an AVS or LRT will move as the restaking ecosystem matures and consolidates. We update this list quarterly; the canonical version lives on our tools page, alongside our other reference material.
The shorter version of this whole article is: glossaries are useful, but precision is more useful. Pick the dimension you mean, quote the specific number, name the actual protocol. That is the difference between a story a reader trusts and a story they have to fact-check on the way through.