Cryptocurrency Glossary

An altcoin is any cryptocurrency other than Bitcoin. The term comes from "alternative coin." Altcoins include Ethereum, Solana, Cardano, and thousands of others. They often aim to improve upon Bitcoin or serve different use cases.

A blockchain is a distributed, decentralized digital ledger that records transactions across many computers. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data, making it resistant to modification.

A cold wallet (or cold storage) is a cryptocurrency wallet that is not connected to the internet. Hardware wallets and paper wallets are examples. Cold storage is considered the most secure way to store large amounts of cryptocurrency.

Decentralized Finance (DeFi) refers to financial services and products built on blockchain networks that operate without traditional intermediaries like banks. DeFi protocols enable lending, borrowing, trading, and earning yield through smart contracts.

Dollar-Cost Averaging (DCA) is an investment strategy where you invest a fixed amount at regular intervals regardless of the asset's price. This reduces the impact of volatility and removes the need to time the market.

Gas fees are transaction fees paid to validators on blockchain networks like Ethereum for processing and validating transactions. Gas prices fluctuate based on network demand — higher demand leads to higher fees.

HODL is a crypto slang term originating from a misspelling of "hold." It refers to the strategy of holding onto cryptocurrency long-term rather than selling during market downturns. It has become a philosophy among long-term crypto believers.

A liquidity pool is a collection of funds locked in a smart contract that facilitates decentralized trading on DEXs. Liquidity providers deposit token pairs and earn fees from trades. They are fundamental to automated market makers (AMMs).

Layer 2 refers to secondary frameworks or protocols built on top of an existing blockchain (Layer 1) to improve scalability and reduce transaction costs. Examples include Polygon, Arbitrum, and Optimism built on Ethereum.

In crypto, market capitalization is calculated by multiplying the current price of a coin by its circulating supply. It is used to rank cryptocurrencies and assess their relative size and dominance in the market.

A Non-Fungible Token (NFT) is a unique digital asset stored on a blockchain that represents ownership of a specific item or piece of content. Unlike cryptocurrencies, NFTs are not interchangeable — each one is unique and cannot be replicated.

A private key is a secret alphanumeric code that allows a cryptocurrency holder to access and manage their funds. It is used to sign transactions and prove ownership. Anyone with access to your private key has full control of your funds.

Proof of Work (PoW) is a consensus mechanism used by Bitcoin where miners compete to solve complex mathematical puzzles to validate transactions and add new blocks to the blockchain. The winner receives a block reward.

Proof of Stake (PoS) is a consensus mechanism where validators are chosen to create new blocks based on the amount of cryptocurrency they stake as collateral. It is more energy-efficient than Proof of Work and is used by Ethereum, Cardano, and others.

A smart contract is a self-executing contract with the terms of the agreement directly written into code. They run on blockchain networks and automatically execute when predetermined conditions are met, without the need for intermediaries.

A seed phrase (also called a recovery phrase or mnemonic phrase) is a series of 12-24 words that serves as a backup for a cryptocurrency wallet. It can be used to recover access to a wallet if the device is lost or damaged.

Staking is the process of locking up cryptocurrency holdings to support the operations of a blockchain network. In return, stakers earn rewards (similar to interest). It is the primary mechanism for Proof-of-Stake blockchains.

A cryptocurrency wallet is a software program or physical device that stores the public and private keys needed to access and manage cryptocurrency holdings. Wallets do not actually store coins — they store the keys that prove ownership on the blockchain.

A whitepaper is a document released by a cryptocurrency project that explains the technology, purpose, tokenomics, and roadmap of the project. Bitcoin's whitepaper by Satoshi Nakamoto is the most famous example in crypto history.

Yield farming is the practice of lending or staking cryptocurrency assets in DeFi protocols to earn rewards. Farmers move assets between protocols to maximize returns. It can offer high yields but carries significant risks including smart contract vulnerabilities.