How Does Bitcoin Work? A Beginner’s Guide to Bitcoin

What is Bitcoin?

Bitcoin is a digital currency that runs on a decentralised network of computers rather than through a bank or government. It was introduced in 2008 in a now-famous paper by the pseudonymous Satoshi Nakamoto, and the network went live in 2009. If you want the original source, the Bitcoin whitepaper is still the clearest statement of the idea.

The core idea is simple to state: a form of money that no single company or country controls, where transactions are verified by the network itself rather than by a trusted middleman.

The blockchain: a shared public ledger

At the heart of Bitcoin is the blockchain: a shared record of every transaction, maintained simultaneously by thousands of computers around the world.

Think of it as a public ledger that everyone can see but no one can quietly alter. Transactions are grouped into “blocks”, and each new block is linked to the one before it, forming a chain that stretches back to the very first transaction. Because copies of this ledger are held across the whole network, there’s no single point that can be tampered with or switched off.

How a Bitcoin transaction works

When you send Bitcoin, you’re not moving a file from one place to another. You’re broadcasting a signed instruction to the network that says, in effect, “transfer this amount from my address to theirs”.

The network checks that the instruction is valid (that the funds exist and that you’re authorised to spend them) and then includes it in a block. A new block is added roughly every 10 minutes. Once the block with your transaction is on the chain and followed by further blocks, the transaction is considered confirmed. This is why Bitcoin transfers aren’t always instant: confirmation takes a little time, and that waiting period is part of what makes the system secure.

Mining: how the network is secured

New blocks are added through a process called mining. Miners are computers that compete to solve a difficult mathematical puzzle, and the first to solve it earns the right to add the next block, along with a reward in newly created bitcoin and the transaction fees in that block.

This process, known as proof-of-work, does two things at once. It releases new bitcoin into circulation in a predictable way, and it makes the network extremely expensive to attack, because rewriting past transactions would mean redoing all that computational work faster than the rest of the network combined. In other words, the security of Bitcoin comes from the sheer cost of cheating.

Why there’s a limited supply

One of Bitcoin’s defining features is its fixed supply. The protocol caps the total number of bitcoin that will ever exist at 21 million.

The rate at which new bitcoin is created also slows over time, through an event called the “halving”, which roughly every four years cuts the mining reward in half. The most recent halving was in April 2024. This built-in scarcity is a deliberate design choice and one of the main reasons Bitcoin is often compared to a digital form of gold, though, like any asset, that comparison has limits and its price can be highly volatile.

Keys and wallets

To hold and use Bitcoin, you use a pair of cryptographic keys. Your address, which is derived from your public key, is what others use to send you Bitcoin, and it’s safe to share. Your private key is what proves the funds are yours and authorises spending, and it must be kept secret.

These keys are managed through a crypto wallet, and there are two basic models. The difference is who holds the private keys.

With a custodial wallet, a company holds the private keys on your behalf, much like a bank holds your money. You usually log in with a username and password, and the company controls access to the funds. That makes it simple, and recovering a lost login is often easier. The trade-off is dependence: you rely on the company to keep your assets safe and available, and if it is hacked, fails or restricts access, your funds can be affected. In Switzerland, FINMA has published guidance on the risks of custody for crypto assets such as Bitcoin and Ether, including the rules supervised institutions must follow to keep customer assets safe.

With a non-custodial service provider, you hold your own keys. No company sits between you and your assets, and nobody else can move your funds without those keys. The trade-off is responsibility: if you lose your keys or recovery phrase, there is usually no one who can restore access, so keeping them safe matters.

Our guides to what a crypto wallet is and crypto custody cover the difference in more depth. The one rule that never changes: whoever controls the private keys controls the bitcoin.

Bitcoin and the wider crypto world

Bitcoin came first, but it’s now one part of a much larger ecosystem. Other networks, such as Ethereum, extended the underlying idea into programmable applications, which is where decentralised finance and a wide range of other crypto services come from.

It helps to keep the distinction clear: Bitcoin is primarily a currency and a store of value, while many newer networks are platforms for building financial applications on top of a blockchain. Both grew from the same breakthrough, a secure, shared ledger that doesn’t need a central authority, but they solve different problems.

What to understand before you start

Bitcoin is powerful, but it isn’t risk-free, and a calm understanding of the risks matters more than any headline. Its price can move sharply. Transactions are generally irreversible, so a mistake, such as sending to the wrong address, usually can’t be undone. And because Bitcoin is valuable and pseudonymous, it attracts scammers.

That last point is worth taking seriously. Before you act on any offer or “opportunity”, it’s worth knowing how to spot a crypto scam. In crypto, the people who stay safe are usually the ones who slow down and verify rather than rush.

In Switzerland, bitcoin you hold is generally part of your taxable wealth. Our guide to crypto taxes in Switzerland explains the basics.

What beginners should remember

The simplest way to think about Bitcoin: it’s money that lives on a shared, public network, secured by mathematics rather than by a bank. Transactions are verified by the network, new coins are created through mining, the total supply is capped, and control comes down to who holds the keys.

You don’t need to understand every technical detail to use Bitcoin responsibly, but understanding the basics helps you make better decisions and avoid common mistakes. When you’re ready to take the next step, our guide to how to buy Bitcoin in Switzerland walks you through the first steps. Our Registration page explains Eti-Tech AG’s membership of VQF, a FINMA-recognised self-regulatory organisation and one of the largest in Switzerland.

Official sources

Bitcoin whitepaper: Bitcoin: A Peer-to-Peer Electronic Cash System

Bitcoin.org: Securing your wallet

FINMA: Guidance on the risks of custody of crypto-based assets (12 January 2026)

VQF: The self-regulatory organisation recognised and supervised by FINMA

Last reviewed: 20 October 2026. This article provides general information, not investment advice.