Blockchain and Cryptocurrency Glossary

The first and most widely recognized cryptocurrency, created in 2009 by the pseudonymous Satoshi Nakamoto. It uses Proof of Work consensus and has a fixed supply cap of 21 million coins.

A decentralized, distributed digital ledger technology that records transactions in a chain of cryptographically linked blocks, providing transparency, immutability, and security without requiring a central authority.

A protocol by which all participants in a blockchain network agree on the current valid state of the distributed ledger, ensuring that all copies of the database are synchronized and accurate.

A digital or virtual currency that uses cryptographic techniques to secure transactions, control the creation of new units, and operate independently of a central bank on a blockchain network.

An organization governed by rules encoded in smart contracts on a blockchain, where decisions are made collectively through token-based voting rather than by a centralized leadership structure.

An ecosystem of financial applications built on blockchain networks that provide services like lending, borrowing, trading, and insurance without traditional intermediaries such as banks or brokerages.

A widely adopted technical standard on the Ethereum blockchain that defines a common set of rules for creating fungible tokens, ensuring interoperability between wallets, exchanges, and applications.

A blockchain platform that extends beyond simple currency transactions by supporting programmable smart contracts and decentralized applications (dApps), using Ether (ETH) as its native cryptocurrency.

A change to a blockchain's protocol that can be either a soft fork (backward-compatible update) or a hard fork (non-backward-compatible change that creates a new, separate chain).

A unit of measurement for the computational work required to execute transactions and smart contract operations on the Ethereum network. Users pay gas fees in ETH to compensate validators.

A programmed event in Bitcoin and some other cryptocurrencies where the block reward paid to miners is cut in half at regular intervals, reducing the rate of new coin creation and introducing deflationary pressure.

A measure of the total computational power being used to mine and process transactions on a Proof of Work blockchain. Higher hash rates indicate greater network security but also higher energy consumption.

A secondary protocol or framework built on top of an existing blockchain that handles transactions off the main chain to improve scalability and reduce costs while inheriting the security of the underlying Layer 1.

A collection of cryptocurrency tokens locked in a smart contract that provides liquidity for decentralized exchanges and DeFi protocols, enabling automated trading without traditional order books.

A hierarchical data structure used in blockchain where transaction hashes are paired and hashed repeatedly until a single root hash remains, enabling efficient verification of any individual transaction within a block.

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.

A unique digital token on a blockchain that represents verifiable ownership of a specific digital or physical asset, distinguishing it from fungible tokens which are interchangeable and identical.

A third-party service that connects blockchains to external off-chain data sources, enabling smart contracts to access real-world information such as market prices, weather data, or event outcomes.

A secret cryptographic key that proves ownership of a blockchain address and is required to authorize transactions. It must be kept confidential, as anyone with access to it can control the associated funds.

A consensus mechanism where validators are selected to create new blocks proportional to the amount of cryptocurrency they have staked as collateral, providing an energy-efficient alternative to Proof of Work.

A consensus mechanism requiring miners to expend computational energy solving cryptographic puzzles to validate transactions and create new blocks, rewarding the first successful miner.

A self-executing program stored on a blockchain that automatically enforces and executes contractual terms when predefined conditions are met, eliminating the need for trusted intermediaries.

A cryptocurrency designed to maintain a stable value relative to a reference asset, typically a fiat currency like the US dollar. Mechanisms include fiat reserves (USDC), crypto collateral (DAI), or algorithmic supply management.

The process of creating a digital representation of a real-world or digital asset on a blockchain, enabling fractional ownership, programmable transfer rules, and increased liquidity.

Software or hardware that stores the private keys needed to access and manage cryptocurrency holdings. Wallets can be hot (internet-connected) or cold (offline) and come in many forms including mobile apps, browser extensions, and physical devices.