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Crypto has its own language. This glossary covers the 50 most important terms you’ll encounter as a beginner. Bookmark this page and come back whenever you see a term you don’t recognize.

A-E

• Airdrop: Free tokens distributed to users, often as a reward for early adoption.
• Altcoin: Any cryptocurrency other than Bitcoin.
• AMM (Automated Market Maker): A DEX mechanism that uses math formulas instead of order books to set prices.
• APY (Annual Percentage Yield): The annual return on an investment, including compound interest.
• Bear market: A period of falling prices, typically 20%+ decline.
• Block: A group of transactions bundled together and added to the blockchain.
• Blockchain: A distributed digital ledger that records all transactions.
• Bridge: Technology that connects different blockchains, enabling asset transfers between them.
• Bull market: A period of rising prices and optimism.
• Burn: Permanently destroying tokens to reduce supply.
• CEX: Centralized Exchange — a traditional crypto exchange like Mal.io or Coinbase.
• Cold wallet: A wallet not connected to the internet. More secure.
• Consensus: The process by which blockchain nodes agree on the state of the ledger.
• dApp: Decentralized Application — an app built on blockchain.
• DAO: Decentralized Autonomous Organization — a community-governed entity.
• DCA: Dollar-Cost Averaging — investing fixed amounts at regular intervals.
• DeFi: Decentralized Finance — financial services on blockchain without intermediaries.
• DEX: Decentralized Exchange — a trading platform without a central company.
• DYOR: Do Your Own Research.
• ERC-20: The standard for tokens on Ethereum.

F-L

• Fiat: Government-issued currency (USD, EUR, SAR).
• FOMO: Fear Of Missing Out — the emotional urge to buy because others are profiting.
• Fork: A change in a blockchain’s protocol. Can be “hard” (creates new chain) or “soft” (backward compatible).
• FUD: Fear, Uncertainty, Doubt — negative information that may or may not be true.
• Gas: The fee for executing transactions on Ethereum.
• Genesis block: The first block of a blockchain.
• Halving: Bitcoin’s reward reduction event (every ~4 years), cutting new supply in half.
• Hash rate: The total computing power securing a proof-of-work blockchain.
• HODL: “Hold On for Dear Life” — the strategy of holding crypto long-term through volatility.
• Hot wallet: A wallet connected to the internet. Convenient but less secure.
• ICO: Initial Coin Offering — a fundraising method where projects sell tokens.
• Impermanent loss: The difference between holding tokens vs providing liquidity in a pool.
• KYC: Know Your Customer — identity verification required by regulated platforms.
• Layer 1: The base blockchain (Bitcoin, Ethereum, Solana).
• Layer 2: Scaling solutions built on top of Layer 1 (Arbitrum, Optimism).
• Liquidity: How easily an asset can be bought or sold without affecting the price.

M-Z

• Market cap: Total value of all coins in circulation (Price × Supply).
• Mempool: The waiting area for unconfirmed transactions.
• Mining: Using computing power to validate transactions and earn rewards (proof-of-work).
• NFT: Non-Fungible Token — a unique digital asset on blockchain.
• Node: A computer that maintains a copy of the blockchain.
• Oracle: A service that provides real-world data to smart contracts.
• Private key: A secret number that controls your cryptocurrency. Never share it.
• Proof of Stake: A consensus mechanism where validators stake tokens as collateral.
• Proof of Work: A consensus mechanism where miners solve puzzles (used by Bitcoin).
• Rug pull: When project creators abandon a project and steal invested funds.
• Seed phrase: 12 or 24 words that can recover your entire wallet. Guard it with your life.
• Smart contract: Self-executing code deployed on a blockchain.
• Stablecoin: A cryptocurrency pegged to a stable asset like the U.S. dollar.
• Staking: Locking up tokens to earn rewards and help secure a proof-of-stake network.
• Token: A cryptocurrency that runs on another blockchain (e.g., USDT on Ethereum).
• TVL: Total Value Locked — the total assets deposited in a DeFi protocol.
• Wallet: Software or hardware that stores your private keys and lets you manage crypto.
• Whale: An entity holding a very large amount of cryptocurrency.
• Yield farming: Maximizing returns by strategically depositing crypto across DeFi protocols.

Keep learning and exploring. The crypto ecosystem is vast and constantly evolving. Start your journey at Mal.io.

Layer 2 (L2) solutions are technologies built on top of existing blockchains to make them faster and cheaper. If Ethereum is a crowded highway, Layer 2s are express lanes that handle most of the traffic while still using the main highway for security. Understanding L2s is increasingly important as they become the primary way people interact with Ethereum.

Why Layer 2 Exists

Ethereum can process about 15 transactions per second. This isn’t enough for millions of users. During busy periods, gas fees on Ethereum spike to $50 or more per transaction. L2s solve this by processing transactions off the main chain (Layer 1) and posting compressed results back. This dramatically increases capacity and reduces costs.

Types of Layer 2

Optimistic Rollups

These assume transactions are valid unless proven otherwise. If someone submits a fraudulent transaction, anyone can challenge it within a “dispute period” (usually 7 days). Used by: Optimism, Arbitrum, Base.

ZK (Zero-Knowledge) Rollups

These use mathematical proofs to prove that transactions are valid. No dispute period needed — validity is guaranteed by math. Used by: zkSync, Starknet, Polygon zkEVM, Linea.

Using Layer 2 in Practice

1. Bridge your assets from Ethereum to the L2 (or buy directly on the L2 through an exchange)
2. Use the L2 just like Ethereum — same wallets (MetaMask), same addresses, same dApps
3. Enjoy much lower fees (cents instead of dollars) and faster confirmations

Popular Layer 2 Networks

• Arbitrum: Largest L2 by TVL. Huge DeFi ecosystem.
• Optimism: Second largest. Home to Base (Coinbase’s L2).
• Base: Built by Coinbase. Growing rapidly.
• zkSync: Leading ZK rollup. Airdropped tokens to early users.
• Polygon: One of the first scaling solutions. Large user base.

Are L2s Safe?

L2s inherit Ethereum’s security for settlement (your funds are ultimately secured by Ethereum). However, L2s themselves have risks:

• They’re newer and less battle-tested than Ethereum L1
• Some L2s have “training wheels” — centralized components that could theoretically be exploited
• Bridging between L1 and L2 introduces additional smart contract risk

For most users, established L2s like Arbitrum and Optimism are safe enough for everyday use. They’re where most of the action is happening in Ethereum today.

Sending crypto might seem simple, but mistakes are permanent. Unlike bank transfers, crypto transactions cannot be reversed. Send to the wrong address and your money is gone forever. This guide will teach you how to send and receive crypto safely.

The Basics

Every crypto transaction needs three things:

1. Sender address: Your wallet
2. Recipient address: Where you’re sending to
3. Network: Which blockchain the transaction uses

The most critical rule: always send to the correct address on the correct network.

Step-by-Step: Sending Crypto

1. Get the recipient’s wallet address. Have them share it via copy-paste or QR code.
2. Verify the network. If they want USDT on Ethereum, make sure you’re sending USDT on Ethereum — not on Tron or BSC.
3. Send a small test amount first. If it arrives, send the rest.
4. Double-check the address. Compare the first and last 6 characters of the address you pasted with the original.
5. Confirm the transaction and wait for blockchain confirmation.

Critical Safety Rules

• Never type addresses manually. Always copy-paste. One wrong character = lost funds.
• Check the network match. Sending Ethereum-based USDT to a Tron address will result in permanent loss.
• Beware clipboard malware. Some malware replaces copied addresses with the hacker’s address. Always visually verify after pasting.
• Test with small amounts. For new addresses or large transfers, always test first.
• Check gas/fees. Make sure you have enough native coin (ETH, SOL, BNB) to pay transaction fees.
• Save frequent addresses. Most wallets and exchanges let you save whitelisted addresses to avoid re-entering them.

Receiving Crypto

1. Open your wallet or exchange account
2. Click “Receive” or “Deposit”
3. Select the correct cryptocurrency and network
4. Copy your address or show the QR code to the sender
5. Wait for the transaction to be confirmed on the blockchain

Common Mistakes

• Wrong network: Sending BSC tokens to an Ethereum address. The tokens may be recoverable but it’s complicated and not guaranteed.
• Wrong token: Sending a similar-named but different token.
• Memo/tag forgotten: Some coins (XRP, XLM, ATOM) require a memo or tag along with the address. Forgetting it can result in lost funds.
• Sending to a smart contract: Some contracts don’t support receiving direct transfers. Funds can be permanently locked.

A blockchain explorer is a website that lets you search and view every transaction, address, block, and smart contract on a blockchain. Think of it as a search engine for the blockchain. Just as you use Google to search the web, you use a blockchain explorer to search the blockchain.

What Can You Do with an Explorer?

• Check transaction status: Did your transfer go through? How many confirmations does it have?
• Verify addresses: Check the balance and transaction history of any wallet address.
• View smart contracts: Read the code of any deployed contract and see its interactions.
• Track tokens: See all holders of a specific token, total supply, and recent transfers.
• Monitor gas prices: Check current network fees before making a transaction.
• Research projects: See real on-chain data — how many users, how much activity, token distribution.

Popular Explorers

• Etherscan: The most popular Ethereum explorer. Also covers Ethereum L2s.
• Solscan / Solana Explorer: For Solana blockchain.
• BscScan: For BNB Chain.
• Blockchain.com Explorer: For Bitcoin.
• Polygonscan: For Polygon.
• Arbiscan: For Arbitrum.

How to Use Etherscan (Example)

1. Go to etherscan.io
2. Paste a transaction hash (txn ID), wallet address, or token contract address in the search bar
3. For a transaction: see sender, receiver, amount, gas used, and status (success/fail)
4. For an address: see ETH balance, token holdings, and full transaction history
5. For a token: see contract code, total supply, holder count, and recent transfers

Why This Matters

Blockchain explorers are essential for:

• Security: Verify that a project is what it claims. Check if the team wallet hasn’t been dumping tokens.
• Research: See real usage data. A project claiming millions of users but showing 100 daily transactions on-chain is lying.
• Troubleshooting: Figure out why your transaction is stuck or failed.
• Transparency: This is one of blockchain’s greatest features — everything is public and verifiable. Use it!

Tokenomics — a combination of “token” and “economics” — is the study of how a cryptocurrency’s economic system works. It covers everything from how tokens are created and distributed to how they gain and retain value. Understanding tokenomics is one of the most important skills for evaluating crypto projects.

Key Tokenomics Factors

Supply

• Total supply: Maximum number of tokens that will ever exist. Bitcoin: 21 million. Some tokens: unlimited.
• Circulating supply: Tokens currently available on the market. Often much less than total supply.
• Inflation rate: How quickly new tokens are created. High inflation = constant sell pressure.
• Burn mechanism: Some protocols permanently destroy tokens, reducing supply over time. Ethereum burns a portion of gas fees.

Distribution

• Team allocation: What % does the team keep? Over 20% is a red flag.
• Investor allocation: What % went to VCs and early investors? These holders often sell as soon as lockups expire.
• Community allocation: What % goes to users through mining, staking, airdrops, or liquidity incentives?
• Treasury: Does the project hold tokens for future development?

Vesting and Unlock Schedules

Most team and investor tokens are “vested” — locked for a period and released gradually. When large unlocks happen, there’s sell pressure. Check the vesting schedule before investing. A project with 80% of tokens still locked could face massive selling when they unlock.

Utility

Why does anyone need to hold or use this token?

• Gas fees: ETH is needed to use Ethereum
• Governance: Token holders vote on protocol decisions
• Staking: Lock tokens to earn rewards
• Payments: Used to pay for services within the ecosystem
• Collateral: Used as backing for loans or other financial products

Tokens with no utility beyond speculation tend to lose value over time.

Red Flags in Tokenomics

• Team holds more than 30% of tokens
• No vesting schedule (team can sell immediately)
• Unlimited supply with high inflation
• Token has no clear utility
• Large upcoming unlock events
• Concentration — a few wallets hold most of the supply

Where to Check Tokenomics

Project whitepapers, CoinGecko/CoinMarketCap supply data, Token Terminal for on-chain metrics, and DeFi Llama for protocol revenue. Always verify tokenomics claims by checking on-chain data.

Web3 is the vision of a new internet where users own their data, control their digital identity, and participate in online communities without depending on big tech companies. It’s built on blockchain technology and represents a fundamental shift in how the internet works — from platforms that extract value from users to protocols that distribute value to users.

The Three Eras of the Internet

Web1 (1990s-2000s): Read Only

Static websites. You could read content, but interaction was limited. Personal homepages, early blogs, search engines. Companies published, users consumed.

Web2 (2000s-present): Read + Write

Social media, user-generated content, mobile apps. Facebook, YouTube, Instagram, TikTok. Users create content, but platforms own the data, control the algorithms, and capture the economic value.

Web3 (emerging): Read + Write + Own

Users own their digital assets (through tokens and NFTs), control their identity (through wallets), and participate in governance (through DAOs). No single company controls the platform. Value flows to users and creators, not just platform shareholders.

Key Web3 Technologies

• Blockchain: The foundation. Provides trustless, transparent record-keeping.
• Smart contracts: Self-executing code that powers Web3 applications.
• Wallets: Your identity and bank account in Web3. One wallet works across all apps.
• Tokens: Digital assets that can represent ownership, governance rights, or access.
• NFTs: Unique digital items — art, tickets, credentials, identity.
• DAOs: Community-governed organizations with transparent, on-chain decision-making.

Web3 in Practice Today

Web3 is still early. Current applications include:

• Decentralized social media (Lens Protocol, Farcaster)
• Play-to-earn games where players own in-game assets
• Decentralized finance (DeFi) — banking without banks
• NFT-based ticketing and memberships
• Decentralized cloud storage (Filecoin, Arweave)

The Honest Assessment

Web3’s vision is compelling but the reality is still catching up. Current Web3 apps are often slower, more complex, and less polished than their Web2 equivalents. User experience needs massive improvement. And many “Web3” projects are just traditional apps with a token added for speculation.

But the underlying principles are powerful: user ownership, composability, transparency, and permissionless innovation. Whether the full Web3 vision materializes or just selected parts get adopted, blockchain technology is already changing how we think about digital ownership and online communities.

Start exploring Web3 by creating a wallet, trying a DeFi protocol, or joining a DAO. The best way to understand Web3 is to experience it firsthand. Begin at Mal.io and explore from there.

Yield farming is the practice of moving crypto between different DeFi protocols to maximize returns. It’s one of the most exciting — and most risky — activities in crypto. At its peak during DeFi Summer 2020, some yield farms offered annual returns of 1,000% or more. Today, sustainable yields are much lower, but opportunities still exist.

How Yield Farming Works

At its simplest, yield farming means putting your crypto to work. Instead of letting your tokens sit idle in a wallet, you deposit them into DeFi protocols that pay you for the privilege of using them:

• Lending: Deposit USDC on Aave and earn 3-5% interest
• Liquidity provision: Add tokens to a Uniswap pool and earn trading fees
• Staking: Lock tokens in a protocol and earn staking rewards
• Incentive farming: Use a protocol that distributes its governance token to users as a reward

Advanced yield farmers stack multiple strategies — depositing LP tokens into farms, borrowing against staked positions, and reinvesting rewards automatically through “auto-compounders” like Yearn Finance or Beefy.

Realistic Yield Expectations

• Stablecoin lending: 3-8% APY (relatively safe)
• Major pair liquidity: 5-20% APY (moderate risk)
• New token incentive farms: 50-200% APY (high risk, usually temporary)
• Leveraged yield farming: Variable, extremely risky

If a yield seems too high to be sustainable, it probably isn’t. Yields above 100% typically come from token inflation — the protocol is printing tokens to attract users. When the incentives end, yields drop to near zero and the token price usually crashes.

Key Risks

• Impermanent loss: The biggest risk for liquidity providers. If one token in your pair moves significantly against the other, you’d have been better off just holding.
• Smart contract risk: DeFi protocols can be hacked. Billions have been lost.
• Token price risk: You might earn 100% APY in a token that drops 90% in price.
• Rug pulls: Some yield farms are designed to steal your money.

Getting Started

1. Start with simple strategies — single-asset staking or stablecoin lending
2. Use only well-audited, established protocols (Aave, Compound, Uniswap, Curve)
3. Understand what you’re earning and why before depositing
4. Start small and increase gradually as you learn
5. Consider gas fees — Ethereum mainnet fees can eat your yield. Use L2s or alt-chains for smaller amounts

An airdrop is when a crypto project distributes free tokens to users — usually to reward early adopters, build community, or market a new token. Some airdrops have been worth thousands or even tens of thousands of dollars per person. Understanding how they work can help you position yourself for future opportunities.

Types of Airdrops

Retroactive Airdrops

The most valuable type. Projects reward users who used their protocol before the token existed. Uniswap airdropped 400 UNI to everyone who had made at least one swap — worth about $1,200 at launch and up to $16,000 at UNI’s peak. Other major retroactive airdrops: dYdX, ENS, Optimism, Arbitrum, Jito.

Standard Airdrops

Projects give tokens to holders of another token. If you hold ETH, a new project might airdrop their token to all ETH holders. These are less common and usually less valuable.

Task-Based Airdrops

Follow on Twitter, join Discord, share a post, sign up for a newsletter — complete a list of tasks and receive tokens. Usually small amounts, sometimes scams.

How to Position for Airdrops

• Use popular protocols early: If a project doesn’t have a token yet, using it might qualify you for a future airdrop.
• Bridge assets: Many L2 bridges have airdropped tokens to early users.
• Participate in testnets: Some projects reward testnet participants when they launch on mainnet.
• Hold governance tokens: Holders of tokens like ETH or ARB often receive airdrops from ecosystem projects.
• Be an active on-chain user: Projects increasingly use sophisticated criteria — number of transactions, duration of use, diversity of activities.

Airdrop Farming

“Airdrop farming” is deliberately using protocols to qualify for future airdrops. Some people use dozens of wallets, each performing the minimum qualifying activities. Projects have gotten smarter about detecting this — they use “Sybil resistance” techniques to filter out farmers and reward genuine users.

Airdrop Scams

Scammers exploit the excitement around airdrops. Common scam patterns:

• Fake airdrop websites that steal your wallet credentials
• Messages asking you to “connect wallet to claim” — connecting to a malicious site can drain your wallet
• “Send ETH to receive airdrop” — legitimate airdrops never ask you to send money first

Golden rule: Never connect your main wallet to unfamiliar websites. Use a burner wallet for risky interactions. Never send money to receive an airdrop.

A Decentralized Exchange (DEX) is a crypto trading platform that operates without a central company. Instead of Coinbase or Binance holding your funds and matching your orders, a DEX uses smart contracts on a blockchain to facilitate trades directly between users. No sign-up. No KYC. No custody of your funds. Just connect your wallet and trade.

How DEXs Work

The most popular DEXs use a system called an Automated Market Maker (AMM). Instead of matching buyers and sellers through an order book, AMMs use liquidity pools — pools of tokens provided by users — and a mathematical formula to set prices automatically.

When you trade on Uniswap, you’re not trading with another person. You’re trading against a pool of tokens. The pool’s smart contract automatically adjusts the price based on supply and demand within the pool.

Popular DEXs

• Uniswap: Largest DEX on Ethereum. Supports thousands of tokens.
• PancakeSwap: Largest DEX on BNB Chain. Lower fees than Uniswap.
• Raydium/Jupiter: Popular DEXs on Solana. Very fast and cheap.
• Curve: Specialized for stablecoin swaps. Very low slippage.
• dYdX: Decentralized perpetual futures trading.

DEX vs CEX (Centralized Exchange)

Risks of DEXs

• Scam tokens: Anyone can list a token on a DEX. Many are scams or rug pulls. Always verify contract addresses.
• Impermanent loss: Liquidity providers can lose value if token prices change significantly.
• Smart contract risk: Bugs in the DEX code can lead to loss of funds.
• No undo button: If you swap to the wrong token or send to the wrong address, there’s no support team to help.

When to Use a DEX vs CEX

Use a CEX like Mal.io for: buying crypto with fiat, trading major coins, ease of use, customer support.

Use a DEX for: trading new or unlisted tokens, DeFi activities, maximum privacy, when you don’t want to give up custody of your funds.

In crypto, “coins” and “tokens” are often used interchangeably, but they’re technically different. Understanding the distinction helps you evaluate projects more accurately.

Coins

A coin is the native cryptocurrency of its own blockchain. Bitcoin (BTC) runs on the Bitcoin blockchain. Ether (ETH) runs on Ethereum. Solana (SOL) runs on the Solana blockchain. These are coins — they’re the “fuel” that powers their respective networks. Coins are used to pay transaction fees, reward validators/miners, and serve as the primary store of value on their chain.

Tokens

A token is a cryptocurrency that runs on someone else’s blockchain. USDT runs on Ethereum (and other chains) — it’s a token, not a coin. Uniswap (UNI) runs on Ethereum — it’s a token. Shiba Inu (SHIB) runs on Ethereum — also a token. Tokens are created using smart contracts on existing blockchains. The most common standard is ERC-20 on Ethereum.

Why It Matters

• Fees: When you send an ERC-20 token, you pay gas fees in ETH (the coin), not in the token itself. You always need some of the native coin to transact.
• Security: Tokens inherit the security of their host blockchain. An ERC-20 token is as secure as Ethereum itself.
• Valuation: Coins typically have more “fundamental” value because they’re essential to network operation. Tokens derive value from their specific use case.
• Migration: Tokens can sometimes move to their own blockchain. BNB started as an ERC-20 token on Ethereum before Binance launched its own chain.

Multi-Chain Tokens

Many tokens exist on multiple blockchains simultaneously. USDT exists on Ethereum, Tron, Solana, and many others. When sending USDT, you must make sure the sender and receiver are on the same network — sending USDT on Ethereum to a Tron address will result in lost funds.

Quick Reference