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Crypto Glossary

Every crypto term an Australian investor actually needs, explained in plain English, with no jargon and no hype.

A
Address
A unique string of letters and numbers that identifies a destination on a blockchain, similar to a bank account number. You share your address to receive crypto, but it is derived from, and never reveals, your private key.
Airdrop
A distribution of free tokens to wallet holders, usually to reward early users or promote a new project. In Australia, airdropped tokens are generally treated as ordinary income at their market value when you receive them, and may trigger capital gains tax later when you sell.
Algorithmic Stablecoin
A stablecoin that tries to hold its peg using automated supply-and-demand mechanics rather than holding cash reserves. These are higher-risk than reserve-backed stablecoins, the 2022 collapse of TerraUSD wiped out billions and is a cautionary example.
Altcoin
Any cryptocurrency other than Bitcoin. The name comes from "alternative coin". Altcoins range from large, established networks like Ethereum to thousands of tiny, speculative tokens, the risk profile varies enormously, so they should never be treated as a single category.
AML/CTF
Anti-Money-Laundering and Counter-Terrorism-Financing laws. Australian crypto exchanges must register with AUSTRAC and verify customer identity (KYC) under these rules, which is why you provide ID when signing up.
APY / APR
Annual Percentage Yield and Annual Percentage Rate, the headline return advertised by staking, lending or "earn" products. Treat very high APYs with deep suspicion: outsized yields almost always carry outsized (and sometimes hidden) risk.
ATO
The Australian Taxation Office, the government body that sets and enforces how crypto is taxed in Australia. The ATO runs a data-matching program that collects transaction records directly from Australian and international exchanges, so most crypto activity is visible to it.
AUSTRAC
Australia's financial intelligence agency. Crypto exchanges operating in Australia must be registered with AUSTRAC as digital currency exchange providers, checking for AUSTRAC registration is a basic safety step when choosing an exchange.
B
Bear Market
A sustained period of falling prices and negative sentiment, often defined as a 20%+ decline from recent highs. Crypto bear markets can be deep and long, but historically they have also been where disciplined investors accumulate quality assets at lower prices.
Bitcoin (BTC)
The first and largest cryptocurrency, created in 2009 by the pseudonymous Satoshi Nakamoto. With a fixed maximum supply of 21 million coins, it is often treated as "digital gold", a scarce, decentralised store of value rather than a payments network.
Block Reward
The new coins paid to a miner or validator for adding a block of transactions to the blockchain. Bitcoin's block reward halves roughly every four years (see Halving), gradually reducing the rate of new supply.
Blockchain
A shared, tamper-resistant digital ledger that records transactions across many computers, so no single party controls it. Once data is confirmed and added to the chain, it is extremely difficult to alter, this is what makes blockchains trustworthy without a central authority.
Bridge
A tool that moves assets from one blockchain to another (for example, from Ethereum to Solana). Bridges are convenient but have historically been a major target for hacks, so they carry meaningful security risk.
Bull Market
A sustained period of rising prices and optimistic sentiment. Bull markets attract new participants and media attention, but they are also where investors are most tempted to overpay and over-concentrate, discipline matters most when everything is going up.
C
CBDC
A Central Bank Digital Currency, a digital form of a national currency issued by a central bank (such as a "digital Australian dollar"). Unlike Bitcoin, a CBDC is centralised and government-controlled.
CGT (Capital Gains Tax)
Tax payable on the profit when you dispose of a crypto asset in Australia. A disposal includes selling for cash, swapping one crypto for another, or spending it. If you hold an asset for more than 12 months, a 50% CGT discount may apply to individuals.
CGT Event
Any transaction the ATO treats as a disposal that may create a capital gain or loss, selling crypto, trading one coin for another, gifting it, or using it to buy goods. Many investors are surprised that crypto-to-crypto swaps are taxable events.
Circulating Supply
The number of coins currently available and trading in the market, as opposed to the total or maximum supply. Comparing circulating supply to total supply reveals how many tokens are yet to be released, future supply that can dilute holders.
Cold Wallet
A crypto wallet kept entirely offline, usually on a dedicated hardware device. Because it is never connected to the internet, it is far harder for hackers to reach, the recommended way to store crypto you do not need to access often.
Consensus Mechanism
The method a blockchain uses to agree on which transactions are valid. The two main types are Proof of Work (used by Bitcoin) and Proof of Stake (used by Ethereum), each with different trade-offs in security, energy use and decentralisation.
Custody
Who controls the private keys to your crypto. With self-custody you hold the keys yourself; with custodial storage (such as leaving coins on an exchange) a third party holds them for you. "Not your keys, not your coins" captures the risk of relying on others.
D
DAO
A Decentralised Autonomous Organisation, a group coordinated by rules written in smart contracts and governed by token-holder voting rather than a traditional management structure.
DApp
A Decentralised Application, software that runs on a blockchain via smart contracts instead of on a company's private servers, so no single operator can unilaterally control or shut it down.
DCA (Dollar-Cost Averaging)
Investing a fixed amount at regular intervals regardless of price, to smooth out the effect of volatility over time. DCA removes the pressure of trying to time the market and is one of the most accessible strategies for everyday investors.
DeFi
Decentralised Finance, financial services such as lending, borrowing, trading and earning yield, built on blockchains without traditional intermediaries like banks. DeFi can offer powerful tools but carries smart-contract, liquidity and regulatory risks.
Diversification
Spreading your investments across different assets so that no single failure can sink your portfolio. Within crypto, this can mean balancing exposure between Bitcoin, large networks and smaller positions, and, more broadly, not holding all your wealth in crypto at all.
DYOR
Short for "Do Your Own Research", a reminder to verify claims independently before investing rather than trusting hype, influencers or social media tips.
E
ETF (Exchange-Traded Fund)
A regulated investment fund that trades on a stock exchange. A spot crypto ETF holds the underlying asset (like Bitcoin) and lets investors gain exposure through a normal brokerage account, without managing wallets or keys themselves.
Ethereum (ETH)
The largest smart-contract blockchain, launched in 2015. It lets developers build decentralised apps, tokens, NFTs and DeFi protocols, and its native asset (ETH) is used to pay transaction fees and secure the network through staking.
Exchange
A platform where you buy, sell and trade cryptocurrencies. Centralised exchanges (such as CoinSpot, Binance or Coinbase) hold custody of your funds, while decentralised exchanges let you trade directly from your own wallet.
F
Fiat
Government-issued currency such as the Australian dollar, US dollar or euro that is not backed by a physical commodity. Its value rests on trust in the issuing government and central bank.
FOMO
Fear Of Missing Out, the emotional urge to buy because an asset is rising and others appear to be profiting. FOMO is a leading cause of buying at market tops and is one of the most expensive emotions in investing.
Fork
A change to a blockchain's rules. A soft fork is backward-compatible, while a hard fork creates a separate chain, sometimes producing an entirely new coin held by existing holders.
FUD
Fear, Uncertainty and Doubt, negative information (sometimes exaggerated or false) that spreads pessimism about an asset. Like FOMO, reacting to FUD without checking the facts often leads to poor decisions.
Fully Diluted Valuation (FDV)
What a project would be worth if every token that will ever exist were already in circulation, calculated as price multiplied by maximum supply. A token can look cheap by market cap but be very expensive by FDV if large amounts of supply are yet to unlock.
G
Gas Fee
The fee paid to process a transaction on a blockchain such as Ethereum. Gas rises and falls with network demand, so the same transaction can cost very different amounts depending on how busy the network is.
Genesis Block
The very first block of a blockchain. Bitcoin's genesis block was mined in January 2009 and famously contained a newspaper headline referencing bank bailouts.
H
Halving
A scheduled event, roughly every four years, that cuts the rate of new Bitcoin issued to miners in half. By steadily reducing new supply, halvings are a key part of Bitcoin's scarcity model and are closely watched by investors.
Hardware Wallet
A physical device (such as a Ledger or Trezor) that stores your private keys offline and signs transactions without exposing those keys to the internet, widely considered the safest practical way for individuals to hold crypto.
Hash Rate
A measure of the total computing power securing a Proof-of-Work network like Bitcoin. A higher hash rate generally means a more secure network that is harder to attack.
HODL
A deliberately misspelled version of "hold", meaning to keep your crypto through volatility rather than trading in and out. It reflects a long-term, conviction-based approach over short-term speculation.
Hot Wallet
A crypto wallet connected to the internet, convenient for trading and everyday use, but more exposed to hacks and malware than offline cold storage. Best used for smaller amounts you actively need.
I
ICO
An Initial Coin Offering, an early fundraising method where a project sells new tokens to raise capital, similar in spirit to a share float. The 2017–2018 ICO boom produced both legitimate projects and many scams, prompting closer regulatory attention.
Impermanent Loss
A loss that liquidity providers in DeFi can experience when the prices of the two assets they deposit move apart. It is "impermanent" only if prices return to their original ratio, otherwise it becomes a real loss.
K
KYC
Know Your Customer, the identity-verification process exchanges must complete under Australian AML/CTF law. It is why you submit ID documents when opening an account on a regulated exchange.
L
Layer 1
A base blockchain network such as Bitcoin, Ethereum or Solana that settles transactions on its own chain. Layer 1s provide the core security and consensus other applications build upon.
Layer 2
A network built on top of a Layer 1 (such as Arbitrum or Optimism on Ethereum) that processes transactions faster and more cheaply, then settles back to the base chain for security.
Ledger
A record of transactions. In crypto, the blockchain itself is a public, distributed ledger. "Ledger" is also the brand name of a popular hardware wallet, context tells you which is meant.
Leverage
Borrowing to increase the size of a trade beyond your own capital. Leverage multiplies both gains and losses and can lead to liquidation (a total loss of the position), it is one of the fastest ways inexperienced investors lose money in crypto.
Liquidation
The forced closure of a leveraged position when its value falls below the required margin. When liquidations cascade, they can accelerate sharp market drops.
Liquidity
How easily an asset can be bought or sold without sharply moving its price. High-liquidity assets like Bitcoin are easy to trade in size; thinly traded tokens can be hard to exit, especially in a falling market.
M
Mainnet
The live, fully operational version of a blockchain where real transactions and real value move, as opposed to a testnet used for development and experimentation.
Market Cap
The total value of a coin, calculated as its current price multiplied by the number of coins in circulation. Market cap is a better gauge of a project's size than price alone, since price depends entirely on supply.
Maximum Supply
The largest number of coins that will ever exist for a given cryptocurrency. Bitcoin's maximum supply is capped at 21 million; many other tokens have no cap, which can dilute holders over time.
Mining
The process of validating transactions and securing a Proof-of-Work blockchain by solving complex computations, in exchange for newly issued coins and transaction fees. Bitcoin is the best-known mined cryptocurrency.
Multisig
A "multi-signature" wallet that requires more than one private key to approve a transaction, for example, two of three keys. It improves security and is often used by businesses, funds and SMSF trustees.
N
NFT
A Non-Fungible Token, a unique digital asset recorded on a blockchain, often representing art, collectibles, in-game items or membership. Unlike a Bitcoin, each NFT is one-of-a-kind and not interchangeable.
Node
A computer that runs a blockchain's software, helping to store, verify and relay transactions. A network with many independent nodes is more decentralised and resilient.
O
On-Chain
Data or activity recorded directly on a blockchain. Analysts study on-chain metrics, such as wallet flows, active addresses and holdings, to understand real network behaviour rather than relying on price alone.
Order Book
A live list of buy and sell orders on an exchange at different prices. It shows current supply and demand and helps explain how much the price might move when large orders are filled.
P
Peg
A fixed value a stablecoin aims to maintain, usually 1:1 with a fiat currency like the US dollar. A stablecoin "losing its peg" (trading away from its target) can signal serious underlying problems.
Private Key
The secret code that proves ownership of your crypto and authorises transactions. Anyone who has it controls your funds, so it must never be shared, photographed or stored online. Losing it can mean losing access permanently.
Proof of Stake (PoS)
A consensus mechanism where validators lock up (stake) coins to help secure the network and are rewarded for honest behaviour. It uses far less energy than Proof of Work and is now used by Ethereum.
Proof of Work (PoW)
A consensus mechanism where miners compete to solve computational puzzles to validate transactions, consuming significant energy. It is the system that secures Bitcoin.
Public Key
The cryptographic counterpart to your private key, from which your shareable wallet address is derived. It lets others send you crypto without exposing your private key.
R
Rug Pull
A scam where a project's creators abandon it and disappear with investors' money, often after hyping a token and removing its liquidity. Rug pulls are a major risk with new, anonymous or unaudited projects.
S
Satoshi (sat)
The smallest unit of Bitcoin, one hundred-millionth of a single Bitcoin (0.00000001 BTC). It is named after Bitcoin's pseudonymous creator, Satoshi Nakamoto.
Seed Phrase
A list of (usually 12 or 24) words that backs up and can fully restore a crypto wallet. Anyone with your seed phrase controls your funds, so store it offline, in private, and never enter it into a website or share it with "support".
Self-Custody
Holding your own private keys rather than trusting an exchange or third party to hold your crypto for you. It gives you full control and removes counterparty risk, but also makes you solely responsible for security.
Slippage
The difference between the price you expect on a trade and the price you actually get, usually due to low liquidity or fast-moving markets. It is more pronounced on large orders and thinly traded tokens.
Smart Contract
Self-executing code on a blockchain that runs automatically when set conditions are met, without an intermediary. Smart contracts power DeFi, NFTs and DApps, but bugs or exploits in their code can lead to large losses.
SMSF
A Self-Managed Super Fund, an Australian superannuation structure where members are also trustees. An SMSF can hold crypto under strict conditions: the trust deed and investment strategy must permit it, assets must be kept separate from personal holdings, and everything must be documented for ATO compliance and annual audit.
Sole Purpose Test
A core SMSF rule requiring the fund to be maintained solely to provide retirement benefits. Gaining any present-day personal benefit from the fund's crypto (such as spending it or staking rewards into a personal wallet) breaches this test.
Stablecoin
A cryptocurrency designed to hold a steady value, usually pegged to a fiat currency such as the US dollar. Reserve-backed stablecoins (like USDC) hold assets to support the peg; algorithmic ones rely on code and carry higher risk.
Staking
Locking up crypto to help secure a Proof-of-Stake network, earning rewards in return, similar in feel to earning interest. In Australia, staking rewards are generally treated as ordinary income at their value when received.
Store of Value
An asset expected to hold its purchasing power over time. Bitcoin is often framed as a digital store of value due to its scarcity, though its short-term volatility makes that role debated.
T
Tax-Loss Harvesting
Deliberately selling crypto at a loss to offset capital gains and reduce tax. In Australia this is legitimate, but "wash sale" arrangements, selling and quickly rebuying purely for a tax benefit, are scrutinised by the ATO.
Testnet
A sandbox version of a blockchain used to test applications and upgrades with valueless tokens, before changes go live on the mainnet.
Token
A digital asset issued on an existing blockchain (such as an ERC-20 token on Ethereum), as opposed to a coin that has its own native blockchain. Tokens can represent currencies, governance rights, access, or real-world assets.
Tokenomics
The economic design of a token, its supply, issuance schedule, distribution, incentives and utility. Strong tokenomics support long-term value; poorly designed tokenomics (heavy insider allocations, rapid unlocks) often signal trouble.
TVL (Total Value Locked)
The total value of assets deposited in a DeFi protocol. TVL is a common gauge of a protocol's size and user trust, though it can be inflated by incentives and falls quickly when sentiment turns.
V
Validator
A participant in a Proof-of-Stake network that stakes coins to confirm transactions and produce blocks, earning rewards for honest behaviour and risking penalties for misconduct.
Volatility
How sharply and quickly an asset's price moves. Crypto is known for high volatility, large swings in both directions, which is why position sizing and a long-term mindset matter so much.
W
Wallet
Software or hardware that stores the keys needed to access and manage your crypto. A wallet does not actually "hold" coins; it holds the keys that prove ownership of assets recorded on the blockchain.
Wash Sale
Selling an asset to claim a tax loss and then quickly buying it back to retain the position. The ATO can disregard the loss where the main purpose of the arrangement is the tax benefit, so this is a high-risk strategy.
Web3
A vision of an internet built on blockchains where users own their data, identity and assets, rather than relying on large centralised platforms. It remains an evolving idea more than a finished reality.
Whale
An individual or entity holding a very large amount of a cryptocurrency, enough that their buying or selling can move the market. Tracking whale activity on-chain is a common form of market analysis.
Whitepaper
A document published by a project explaining its purpose, technology, tokenomics and roadmap. Reading the whitepaper is a basic step in researching a token, though a polished whitepaper alone is never proof of legitimacy.
Y
Yield Farming
Moving crypto between DeFi protocols to chase the highest available returns from lending, staking or providing liquidity. It can be lucrative but is complex and carries smart-contract, liquidity and impermanent-loss risks.
Z
Zero-Knowledge Proof
A cryptographic method that lets one party prove a statement is true without revealing the underlying data. It underpins privacy features and many Layer-2 scaling solutions.

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