Crypto Glossary: Blockchain and Web3 Terms Explained
Complete glossary of cryptocurrency, blockchain, and Web3 terminology for 2026. From AMM to ZK-proofs.
A — AMM to Atomic Swap
AMM (Automated Market Maker): A decentralized exchange mechanism that uses mathematical formulas to price assets instead of order books. Uniswap, Curve, and Balancer are popular AMMs. Liquidity providers deposit token pairs and earn fees from trades. The constant product formula (x * y = k) is the most common AMM design. Airdrop: A distribution of free tokens to wallet addresses, typically used for marketing or rewarding early users. Airdrops became a major crypto incentive mechanism in 2024-2026. Atomic Swap: A peer-to-peer exchange of different cryptocurrencies without using a centralized intermediary. Atomic swaps use hash time-locked contracts (HTLCs) to ensure both parties complete the trade or neither does.
B — Bitcoin to Bridge
Bitcoin (BTC): The first cryptocurrency, created in 2009 by Satoshi Nakamoto. Bitcoin uses proof-of-work consensus and has a fixed supply of 21 million coins. In 2026, Bitcoin remains the largest cryptocurrency by market capitalization. Block: A collection of transactions bundled together and added to the blockchain. Each block contains a hash of the previous block, creating an immutable chain. Block times vary: Bitcoin ~10 minutes, Ethereum ~12 seconds, Solana ~400 milliseconds. Bridge: A protocol enabling asset transfers between different blockchains. Bridges are a frequent target for hackers due to the large amounts of value they hold. Cross-chain bridges include Wormhole, LayerZero, and Axelar.
C — Consensus to Custody
Consensus Mechanism: The method by which a blockchain network agrees on the current state. Proof-of-Work (PoW) uses computational puzzles. Proof-of-Stake (PoS) uses staked tokens. Other mechanisms include Delegated PoS, Proof-of-History, and Byzantine Fault Tolerance. Cold Wallet: A cryptocurrency wallet that is not connected to the internet, providing maximum security against hacking. Hardware wallets (Ledger, Trezor) are the most common cold storage solution. Custody: The management and safekeeping of crypto assets. Self-custody means holding your own private keys. Institutional custody services like Coinbase Custody and Fireblocks provide insured storage for large holdings.
D — DeFi to DEX
DeFi (Decentralized Finance): Financial services built on blockchain without traditional intermediaries. DeFi includes lending (Aave, Compound), trading (Uniswap), derivatives (dYdX), and yield farming. Total Value Locked (TVL) in DeFi exceeded $200 billion in 2026. DAO (Decentralized Autonomous Organization): An organization governed by smart contracts and token holder votes rather than a traditional management structure. DAOs manage treasuries, fund development, and make protocol decisions. DEX (Decentralized Exchange): A cryptocurrency exchange that operates without a central authority. Users trade directly from their wallets via smart contracts. DEXs offer greater privacy and censorship resistance than centralized exchanges.
E-G — EVM to Gas
EVM (Ethereum Virtual Machine): The runtime environment for smart contracts on Ethereum and EVM-compatible chains (Polygon, Arbitrage, Optimism, Base). The EVM executes bytecode compiled from Solidity or Vyper. ERC-20: The standard interface for fungible tokens on Ethereum. ERC-20 defines functions like transfer, approve, and balanceOf. Most DeFi tokens follow ERC-20. ERC-721 is the equivalent standard for NFTs. Gas: The unit measuring computational effort on Ethereum. Every operation costs gas, paid in ETH. Gas prices fluctuate with network demand. Layer 2 solutions like Arbitrum and Optimism reduce gas costs by 10-100x compared to Ethereum mainnet.
H-L — Hash to Liquidity
Hash Function: A mathematical function that converts input data into a fixed-size output (hash). SHA-256 is used in Bitcoin mining. Keccak-256 is used in Ethereum. Hash functions are one-way — you cannot reverse-engineer the input from the output. Impermanent Loss: The loss experienced by liquidity providers when the price ratio of their deposited tokens changes. The larger the price change, the greater the loss relative to simply holding. Layer 2 (L2): A secondary blockchain built on top of a Layer 1 (like Ethereum) to improve scalability. Rollups (Optimistic and ZK) are the dominant L2 approach. Liquidity Pool: A smart contract containing token reserves that enable decentralized trading. Providers earn fees proportional to their share of the pool.
M-P — MEV to Protocol
MEV (Maximal Extractable Value): The profit that block producers can extract by reordering, inserting, or censoring transactions within a block. MEV is a major concern for DeFi fairness. Flashbots and MEV-Share attempt to mitigate harmful MEV. Mining: The process of using computational power to validate transactions and create new blocks in proof-of-work blockchains. Bitcoin mining consumed approximately 150 TWh of electricity in 2025. NFT (Non-Fungible Token): A unique digital asset on a blockchain, representing ownership of art, collectibles, gaming items, or real-world assets. NFTs use ERC-721 or ERC-1155 standards. Protocol: A set of rules governing how a blockchain or DeFi application operates. Protocols are typically governed by DAOs and can be upgraded through governance proposals.
R-S — Rollup to Staking
Rollup: A Layer 2 scaling solution that executes transactions off-chain and posts compressed data to Layer 1. Optimistic Rollups (Arbitrum, Optimism) use fraud proofs. ZK-Rollups (zkSync, StarkNet) use validity proofs. Smart Contract: Self-executing code deployed on a blockchain that automatically enforces agreement terms. Smart contracts enable DeFi, NFTs, DAOs, and complex multi-party transactions without intermediaries. Solidity is the primary smart contract language for EVM chains. Staking: Locking cryptocurrency to support network operations (validation, governance) in exchange for rewards. Ethereum staking requires 32 ETH and earns ~4-5% APY. Liquid staking protocols (Lido, Rocket Pool) allow staking with any amount.
T-Z — Token to ZK-Proof
Token: A digital asset on a blockchain. Tokens can be fungible (ERC-20, interchangeable like currency) or non-fungible (ERC-721, unique like art). Utility tokens provide access to services. Governance tokens grant voting rights. TVL (Total Value Locked): The total amount of assets deposited in a DeFi protocol. TVL is the primary metric for measuring DeFi adoption and protocol health. Wallet: Software or hardware that stores private keys and enables cryptocurrency transactions. Hot wallets (MetaMask, Phantom) are connected to the internet for convenience. Cold wallets (Ledger, Trezor) are offline for security. Zero-Knowledge Proof (ZK-Proof): A cryptographic method that proves a statement is true without revealing the underlying data. ZK-proofs enable privacy-preserving transactions and scalable blockchain validation. ZK-rollups use these proofs for Layer 2 scaling.