Bitcoin is software that lets you send money to anyone without a bank, government, or company in the middle. It has been running since January 3, 2009, with zero downtime and zero maintenance windows. Nobody runs it.
If you have already read our What is Bitcoin guide and want to understand the mechanics, keep reading. Each section below covers one piece of how Bitcoin works. Where a concept has more detail, we link to the relevant glossary page so you can dig in at your own pace.
There's no company behind it
Bitcoin has no CEO, no board of directors, and no headquarters. The software is open source, so anyone can read the code, copy it, or propose changes to it.
Instead of a central server, thousands of computers around the world run Bitcoin software independently. These computers are called nodes. Each node keeps a full copy of every transaction that has ever happened on the network and independently verifies that every new transaction follows the rules.
You cannot shut Bitcoin down for the same reason you cannot shut down email: there is no single server to unplug. As long as any nodes are running anywhere in the world, the network keeps going. If a government bans Bitcoin in one country, the rest of the nodes carry on without interruption.
Changing the rules requires broad agreement among node operators. Nobody can force an update. That makes the protocol very resistant to manipulation, but it also means upgrades happen slowly. The slow pace is the point: it keeps any single person, company, or government from altering Bitcoin's core properties.
New bitcoin is created on a schedule no one can change
Only 21 million bitcoin will ever exist. That cap is written into the code. Changing it would require agreement from the entire network of node operators, something that has never happened and almost certainly never will. As of early 2026, nearly 20 million bitcoin have already been created. The remaining million-plus will trickle out over the next 114 years.
Where do new coins come from? The computers that process transactions earn them. This process is called mining. Roughly every 10 minutes, a miner adds a new block of transactions to the chain and collects a fixed amount of newly created bitcoin as a block reward.
That reward gets cut in half approximately every four years in an event called the halving. When Bitcoin launched in 2009, miners earned 50 BTC per block. After four halvings, the reward is now 3.125 BTC per block (since April 2024). The next halving will drop it to 1.5625 BTC. This schedule continues until the last fraction of a bitcoin is mined around the year 2140.
Compare that to traditional currencies. A central bank can create more dollars, euros, or yen whenever it chooses. Nobody can do the same with bitcoin. The supply schedule is fixed, public, and enforced by math rather than policy decisions.
Transactions are verified by a network, not a bank
When you send bitcoin, here is what happens. Your wallet software creates a transaction that says, in effect, "move this amount from my address to that address." The wallet signs it with your private key to prove you authorized it, then broadcasts the signed transaction to the Bitcoin network.
Your transaction lands in a waiting area called the mempool (short for memory pool). The mempool is where unconfirmed transactions sit until a miner picks them up. Miners select transactions from the mempool, verify that you actually own the bitcoin you are trying to send, bundle them into a block, and compete to add that block to the chain.
Adding a block requires solving a computationally intensive puzzle called proof of work. The first miner to solve the puzzle earns the block reward plus the transaction fees from every transaction in that block. A new block lands roughly every 10 minutes. The puzzle is what makes Bitcoin secure: faking a transaction would mean out-computing every other miner on the planet.
Once your transaction is included in a block, it has one confirmation. Each subsequent block added on top of it adds another confirmation. More confirmations mean greater certainty that the transaction is final. For small amounts, one or two confirmations are typically sufficient. For large amounts, waiting for six confirmations (about an hour) is standard practice.
No bank approves or denies your transaction. Nobody reviews it, and nobody can reverse it once the network has confirmed it.
Everything is recorded on a public ledger
Every Bitcoin transaction that has ever happened is recorded on the blockchain, a public ledger made up of blocks chained together in sequence. Each block contains a batch of transactions. You can look up any transaction, any address, or any block. The entire history is open.
The ledger does not sit on one server. Every node on the network keeps a complete copy. As of 2026, tens of thousands of nodes spread across dozens of countries each independently maintain and verify the same record.
That redundancy is what makes the blockchain tamper-resistant. To change a past record, an attacker would need to redo the proof-of-work for that block and every block after it, then convince a majority of nodes to accept the altered version. Hundreds of exahashes per second of computing power stand in the way. In practice, it cannot be done.
Transparency does not mean zero privacy. Bitcoin addresses are strings of letters and numbers, not names. You can look up how much bitcoin an address holds and trace where it was sent, but the address alone does not reveal who controls it. Bitcoin is pseudonymous. If someone links an address to a real identity (through an exchange, for example), the full transaction history of that address becomes traceable.
You control your money with keys, not a username and password
When you own bitcoin, you really own a private key, a long string of numbers that lets you authorize transactions from a specific address. There is no account, no username, and no password reset. Whoever holds the private key controls the bitcoin at that address.
In practice, you do not interact with private keys directly. Your wallet software manages them for you. The wallet generates your keys, stores them securely, and uses them to sign transactions when you want to send bitcoin.
Your seed phrase is the master backup of all your keys. It is a list of 12 or 24 words generated when you first set up your wallet. From those words, you can recreate every private key your wallet will ever use. If your phone breaks, your computer dies, or your hardware wallet is damaged, those words are all you need to recover your bitcoin on a new device.
That is the core tradeoff of self-custody. You have full control: nobody can freeze your funds, reverse your transactions, or stop you from sending bitcoin wherever you want. But there is no safety net. If you lose your seed phrase and lose access to your wallet device, your bitcoin is gone permanently. Nobody can recover it for you.
For long-term storage, you can use cold storage: a dedicated hardware device that keeps your private keys offline. Our best Bitcoin wallets guide covers the options in detail.
The network has been running continuously since 2009
Bitcoin has processed transactions 24/7 since January 3, 2009. In more than 17 years, nobody has hacked the protocol or taken the network offline. It ran through financial crises, pandemics, wars, and government bans in multiple countries with near-perfect uptime.
Hundreds of thousands of participants around the world maintain the network. The only coordination they need is the shared set of software rules they all chose to run. The system requires no maintenance windows or planned downtime, and no single machine can bring it down by failing.
That said, risks exist outside the protocol. Hackers have stolen billions of dollars from cryptocurrency exchanges over the years. People have lost seed phrases and permanently lost access to their bitcoin. The price is volatile and has dropped 80% or more from its peaks on multiple occasions.
But the core protocol, the rules governing how bitcoin is created, transferred, and verified, has an unbroken track record. Every ten minutes, a new block lands, and the code does exactly what it says it will do.
What about Lightning?
The base Bitcoin network processes about 7 transactions per second. For everyday payments like buying coffee, that is slow, and fees spike when the network gets busy.
The Lightning Network is a layer built on top of Bitcoin that enables near-instant, low-cost transactions. You open a payment channel with another user, and you can send payments back and forth through that channel without touching the main blockchain. When you close the channel, the final balances settle on-chain.
A rough analogy: the Bitcoin blockchain is like a bank wire (large, final settlements), and Lightning is like a debit card (fast, small payments). Both use real bitcoin.
Lightning is still growing. It works well for small, fast payments, but it adds complexity. If you are just getting started, focus on the base layer first. You will care about Lightning when you want to spend bitcoin day to day rather than hold it long term.
Where to go from here
You understand how Bitcoin works. Here is where to go next, depending on what you want to do.
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