How does Bitcoin work?
Written by an ex-institutional trader. How Bitcoin works under the hood: the shared blockchain ledger, how a transaction travels the network (shown with a diagram), how mining secures it, keys and wallets, and why the design matters.
Direct answer
Bitcoin works as a shared, public record of transactions, the blockchain, maintained by thousands of computers worldwide rather than a bank. When you send Bitcoin, your transaction is broadcast to the network, bundled into a block, verified by miners who compete using computing power, and then permanently recorded on the blockchain that everyone can see. No central authority is needed, and no one can quietly change the record.
Ownership is controlled by cryptographic keys: a public address others can send to, and a private key only you hold that authorises spending. Mining both secures the network and releases new coins on a fixed schedule, with the reward halving every four years up to a hard cap of 21 million. The result is digital money that is decentralised, transparent and very hard to counterfeit, though the price is volatile and you are responsible for keeping your keys safe.
The big picture
Bitcoin works as a shared, public record of transactions, the blockchain, maintained by thousands of computers worldwide rather than by a bank. When you send Bitcoin, the network verifies it, records it permanently, and lets everyone confirm the same history. No central authority sits in the middle, and no one can quietly rewrite the record.
That single idea, a ledger no one controls but everyone can trust, is what makes Bitcoin work. The rest is the machinery that makes it secure and tamper-proof.
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The shared ledger
The blockchain is a chain of blocks, each holding a batch of transactions and linked to the one before it. Every participant keeps a copy, so the record is not held in one place that could be hacked or shut down. Because each block is cryptographically tied to the previous one, changing an old transaction would break the chain and be rejected by the network. This is what makes Bitcoin's history effectively permanent.
How a transaction works
Sending Bitcoin follows the same path every time. The diagram shows it:
Once a few more blocks build on top of the one containing your transaction, it is considered settled and effectively irreversible.
Mining and new supply
Miners are the computers that compete to add each new block by solving a hard puzzle, a process called proof of work. The winner earns newly created Bitcoin plus the transaction fees, which is both how the network is secured and how new coins enter circulation.
New supply is strictly limited. The block reward halves roughly every four years in an event called the Bitcoin halving, heading towards a hard cap of 21 million coins around the year 2140. This fixed, transparent issuance is a core part of Bitcoin's appeal as sound money.
Keys and wallets
Ownership comes down to cryptographic keys. You have a public address others can send Bitcoin to, and a private key that only you hold and that authorises spending. A crypto wallet does not really store coins; it stores and protects these keys. Lose the private key and the funds are unreachable; let someone else get it and they can take your Bitcoin. For larger amounts, a hardware wallet that keeps keys offline is the standard safeguard.
Why the design matters
Put together, the design gives Bitcoin its defining properties: it is decentralised (no one controls it), transparent (anyone can verify the record), and very hard to counterfeit or censor. That is a genuinely new kind of money, which is why it has drawn so much attention.
The trade-offs are real too: the price is highly volatile, transactions are irreversible, and you carry the responsibility for securing your own keys. For most Australians the simplest start is to buy a small amount on a reputable AUSTRAC-registered exchange and learn how it works first-hand.
Popular Australian crypto exchanges
All three are AUSTRAC-registered Australian exchanges. Crypto is volatile; only invest what you can afford to lose.
This is general information, not financial advice. Last reviewed: 2026-06-02.
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Frequently asked questions
How does Bitcoin work in simple terms?
Bitcoin is money that lives on a shared public record called the blockchain, kept by thousands of computers around the world instead of a bank. When you send Bitcoin, the network checks you own it, bundles the transaction into a block, and records it permanently for everyone to see. Ownership is proven with a secret private key that only you hold. There is no central company in charge, and no one can secretly alter the record.
Where is Bitcoin actually stored?
Bitcoin is not stored as a file anywhere; what exists is the record of transactions on the blockchain, which determines how much each address holds. Your wallet does not store coins so much as store the private keys that let you spend the balance assigned to your addresses. That is why protecting your keys, ideally with a hardware wallet for larger amounts, is the same as protecting your Bitcoin.
How are Bitcoin transactions verified?
When you send Bitcoin, the transaction is broadcast to the network, where computers check that your keys authorise it and that you have the funds. Miners then compete to bundle valid transactions into a block by solving a hard puzzle (proof of work). The winning miner adds the block, and the rest of the network confirms it. Once a few more blocks build on top, the transaction is considered settled and effectively irreversible.
Who controls Bitcoin?
No single person, company or government controls Bitcoin. It is run by its global network of users, miners and developers, who all follow the same open rules written into its software. Changes to those rules require broad agreement across the network, which makes Bitcoin very resistant to control or censorship. This decentralisation is the whole point of its design and the main thing that distinguishes it from money issued by a bank.
Why can't Bitcoin be counterfeited or double-spent?
Because every transaction is recorded on the shared blockchain that the whole network verifies, you cannot spend the same Bitcoin twice; the network would reject the second attempt as conflicting with the record. Counterfeiting is prevented because new coins can only be created through mining, on a fixed schedule, and any fake transaction would fail the network's checks. The combination of cryptography and global consensus is what makes the system trustworthy without a central referee.
Is Bitcoin safe to use in Australia?
Bitcoin itself is secure, and it is legal to buy, hold and sell in Australia through AUSTRAC-registered exchanges. The main risks are not the technology but the price, which is highly volatile, and personal security: if you lose your private keys or fall for a scam, the funds are usually gone for good with no bank to reverse it. Use a reputable exchange, secure your keys, and remember that selling Bitcoin is generally a taxable event.
