What is cryptocurrency?
Written by an ex-institutional trader. A clear, beginner-friendly explanation of what cryptocurrency is, how it works (shown with a diagram), what makes it different from regular money, how Australians buy and hold it, and the honest risks.
Direct answer
Cryptocurrency is digital money secured by cryptography and recorded on a blockchain, a shared ledger maintained by a decentralised network rather than a bank or government. Bitcoin was the first, launched in 2009; there are now thousands of others. Because no central party controls the ledger, crypto can be sent person-to-person anywhere, any time, without a bank in the middle, and the supply of many coins is fixed by code rather than set by a central bank.
In Australia, you buy and hold cryptocurrency through AUSTRAC-registered exchanges, and it is legal and widely used. It is also volatile and largely speculative: prices swing hard, there is no central authority to reverse a mistaken or fraudulent transaction, and most of the consumer protections that apply to bank deposits do not apply. Treat it as a high-risk asset, only invest what you can afford to lose, and remember the ATO taxes most crypto gains.
What cryptocurrency is
Cryptocurrency is digital money, secured by cryptography and recorded on a blockchain: a shared ledger maintained by a decentralised network of computers rather than by a bank or government. Bitcoin, launched in 2009, was the first. There are now thousands of cryptocurrencies, but they share that core idea: a form of money that no single institution controls.
The defining feature is decentralisation. With regular money, a bank keeps the master record of who owns what. With cryptocurrency, that record is held collectively across the whole network, so value can move directly from one person to another without a bank in the middle.
Disclosure: SatoshiMacro may earn a commission if you sign up to an exchange through links on this page, at no extra cost to you. See our full affiliate disclosure.
How it works
The diagram shows the key idea. Traditional money runs through a central hub (a bank) that every transaction passes through. Cryptocurrency runs on a decentralised network where many computers hold the same ledger and verify transactions together, with no single point of control.
When you send crypto, the transaction is broadcast to the network, verified, and added to the blockchain, where it becomes a permanent record. Cryptography ensures only you can spend your coins and stops the same coin being spent twice. Once confirmed, a transaction generally cannot be reversed, which is powerful but unforgiving.
How it differs from regular money
The contrast with money in a bank account is the fastest way to understand crypto.
| Feature | Cryptocurrency | Money in a bank |
|---|---|---|
| Who controls it | A decentralised network | Banks and central banks |
| Supply | Often fixed by code (e.g. 21M Bitcoin) | Set by central-bank policy |
| Transfers | Direct, peer-to-peer, 24/7 | Via banks, business hours, fees |
| Reversibility | Generally irreversible | Can be disputed or reversed |
| Consumer protection | Minimal; no deposit guarantee | Government deposit guarantee applies |
| Volatility | High | Stable |
That irreversibility and lack of a central authority are double-edged: they give crypto its independence and censorship-resistance, but they also mean there is no one to call if you send funds to the wrong address or fall for a scam.
Types of cryptocurrency
Not all cryptocurrencies do the same thing. The main categories:
- Bitcoin: the original, designed as a decentralised store of value and payment network, with a fixed 21 million supply.
- Altcoins: every cryptocurrency other than Bitcoin. Ethereum, the largest, adds programmable smart contracts that power much of the wider ecosystem.
- Stablecoins: coins designed to hold a steady value, usually pegged to the US dollar. See what is a stablecoin.
- Tokens: assets built on top of an existing blockchain, covering everything from DeFi to NFTs.
The vast majority of the thousands of coins in existence are highly speculative and many will fail. A small number have real adoption and staying power.
Cryptocurrency in Australia
Crypto is legal and widely held in Australia. You buy it through an AUSTRAC-registered exchange: sign up, verify your identity, deposit Australian dollars (commonly via PayID or Osko), and buy the coin you want. You can leave it on the exchange or move it to a personal wallet for more control.
Two practical points matter for Australians. First, choose a reputable AUSTRAC-registered exchange; the best crypto exchanges in Australia guide compares the main options. Second, the ATO taxes most crypto as a capital-gains asset, so selling, swapping or spending it is usually a taxable event. The crypto tax in Australia guide explains how that works and the 50 percent CGT discount for assets held over 12 months.
The risks
Crypto is genuinely high-risk, and the honest version matters:
- Volatility. Prices swing violently. Large drawdowns are normal, not exceptional.
- No safety net. No central authority reverses mistaken or fraudulent transactions, and there is no government deposit guarantee.
- Scams and security. The space attracts fraud, and self-custody means you are responsible for securing your own keys.
- Speculation. Most coins have no underlying cash flow; their price is pure supply and demand, and many will go to zero.
None of this means crypto is illegitimate, but it does mean treating it as a small, high-risk slice of a portfolio, only with money you can afford to lose. When you are ready to buy, start with a reputable AUSTRAC-registered exchange.
Popular Australian crypto exchanges
All three are AUSTRAC-registered Australian exchanges. Crypto is volatile; only invest what you can afford to lose.
From here, the natural next reads are how does Bitcoin work and what is blockchain for the technology underneath, what is Ethereum for the other major network, what is a crypto wallet for storing it safely, and the best crypto exchanges in Australia ranking when you are ready to buy.
Crypto is a high-risk, volatile asset. This is general information, not financial advice. Last reviewed: 2026-06-02.
Frequently asked questions
What is cryptocurrency in simple terms?
Cryptocurrency is digital money that exists only electronically and is secured by cryptography. Instead of a bank keeping track of who owns what, the record is kept on a blockchain, a shared ledger maintained by a decentralised network of computers around the world. That means you can send it directly to someone else without a bank in the middle. Bitcoin is the best-known example. The value of most cryptocurrencies is set purely by supply and demand, which is why prices can move sharply.
How does cryptocurrency work?
When you send cryptocurrency, the transaction is broadcast to a network of computers that verify it and add it to the blockchain, a permanent shared ledger. Cryptography ensures only the owner can spend their coins and prevents the same coin being spent twice. No single company or government runs the network; it is maintained collectively, which is what makes it decentralised. Once a transaction is confirmed on the blockchain it generally cannot be reversed, which is very different from a bank transfer.
Is cryptocurrency legal in Australia?
Yes. Cryptocurrency is legal to buy, hold and sell in Australia. Exchanges operating here must be registered with AUSTRAC, the financial-crimes regulator, and follow anti-money-laundering and identity-verification rules. Crypto is not legal tender (you cannot be required to accept it as payment), but owning and trading it is completely legal. The ATO treats most crypto as a capital-gains-tax asset, so gains are generally taxable, which is covered in the crypto tax guide.
Is cryptocurrency a good investment?
Cryptocurrency is a high-risk, speculative asset, not a guaranteed investment. Prices are extremely volatile, swinging double-digit percentages in a day is normal, and there is no underlying cash flow or central authority backing most coins. Some people have made large gains and others large losses. A sensible approach treats crypto as a small, high-risk part of a diversified portfolio, only with money you can afford to lose entirely, rather than as a safe store of value or a get-rich-quick scheme.
What is the difference between cryptocurrency and Bitcoin?
Bitcoin is a cryptocurrency, the first and largest one, but it is not the only one. Cryptocurrency is the broad category for all digital currencies secured by cryptography on a blockchain; Bitcoin is a single example within it. There are thousands of others, often called altcoins, including Ethereum, as well as stablecoins designed to hold a steady value. So all Bitcoin is cryptocurrency, but not all cryptocurrency is Bitcoin, in the same way all sedans are cars but not all cars are sedans.
How do Australians buy cryptocurrency?
The usual way is through an AUSTRAC-registered Australian crypto exchange. You sign up, verify your identity, deposit Australian dollars (commonly via PayID, Osko or bank transfer), and buy the coin you want. The crypto can then be held in the exchange account or moved to a personal wallet for greater control. Choosing a reputable, AUSTRAC-registered exchange matters for security and compliance; the best crypto exchanges guide compares the main Australian options.
