Bitcoin is software that lets people send money to each other without a bank, government, or company in the middle. It has been running since January 3, 2009. No downtime. No maintenance windows. No one in charge.
If you have already read our What is Bitcoin guide and you are ready to understand the mechanics, this is where we go deeper. Each section below explains one piece of how Bitcoin works. Where a concept has more detail, we link to the relevant glossary page so you can explore further at your own pace.
There's no company behind it
Bitcoin is not run by a company, a CEO, or a board of directors. There is no headquarters, no corporate office, and no customer support department. The software is open source, meaning anyone in the world 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.
No single person or organization can shut Bitcoin down for the same reason no one can shut down email: there is no single server to unplug. As long as any nodes are running anywhere in the world, the network continues to operate. If a government bans Bitcoin in one country, the rest of the network keeps running without interruption.
Changes to Bitcoin's rules require broad agreement among node operators. No one can force an update. This makes Bitcoin extremely resistant to manipulation, but it also means changes happen slowly and deliberately. That slowness is a feature, not a bug. It protects the network's core properties from being altered by any individual, company, or government.
New bitcoin is created on a schedule no one can change
Only 21 million bitcoin will ever exist. That number is written into the code and cannot be changed without the agreement of the entire network, which 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 be released gradually over the next 114 years.
New bitcoin enters circulation as a reward for the computers that process transactions. This process is called mining. Roughly every 10 minutes, a miner successfully adds a new block of transactions to the chain and receives 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.
This is fundamentally different from how traditional currencies work. Central banks can decide to create more dollars, euros, or yen whenever they choose. No one can decide to create more bitcoin. The supply schedule is fixed, public, and enforced by mathematics rather than policy.
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." It signs the transaction with your private key to prove you authorized it. Then it broadcasts that 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. This is called proof of work, and it is what makes the system secure. The first miner to solve the puzzle earns the block reward and the transaction fees from every transaction in that block. On average, a new block is added every 10 minutes.
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 the transaction. No one reviews it. No one can reverse it once it is confirmed. The math does the work.
Everything is recorded on a public ledger
Every Bitcoin transaction that has ever happened is recorded on the blockchain. The blockchain is a public ledger, essentially a long chain of blocks, each containing a batch of transactions. Anyone can look up any transaction, any address, any block. The entire history is open and transparent.
The ledger is not stored in one place. Every node on the network keeps a complete copy. As of 2026, there are tens of thousands of nodes spread across dozens of countries, each independently maintaining and verifying the same ledger.
This is what makes the blockchain tamper-resistant. To change a historical 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. With hundreds of exahashes per second of computing power securing the network, this is not practically possible.
Transparency does not mean a lack of 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 itself does not reveal who controls it. It is pseudonymous, not anonymous. If an address is ever linked to a real identity (through an exchange, for example), all of its history becomes attributable.
You control your money with keys, not a username and password
When you own bitcoin, what you actually own is a private key that lets you authorize transactions from a specific address. There is no account. No username. No password reset. The private key is a long string of numbers that proves ownership, and whoever holds it 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, every private key your wallet will ever use can be recreated. 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.
This is the core tradeoff of self-custody. You are in complete control. No one can freeze your funds, reverse your transactions, or prevent you from sending your bitcoin wherever you want. But that also means there is no safety net. If you lose your seed phrase and lose access to your wallet device, your bitcoin is gone permanently. No company, no developer, and no government can recover it.
For long-term storage, many people use cold storage, keeping their private keys on a dedicated hardware device that never connects to the internet. Our best Bitcoin wallets guide covers the options in detail.
The network has been running continuously since 2009
Bitcoin has processed transactions 24 hours a day, 7 days a week, since January 3, 2009. It has never been hacked. It has never been shut down. It has operated through financial crises, pandemics, wars, and government bans in multiple countries. The network has maintained near-perfect uptime across more than 17 years of operation.
The network is maintained by hundreds of thousands of participants around the world with no coordination required beyond the software rules everyone agreed to run. There is no maintenance schedule, no planned downtime, and no single point of failure.
This does not mean there are no risks. Cryptocurrency exchanges have been hacked, with billions of dollars in customer funds stolen 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 that govern how bitcoin is created, transferred, and verified, has an unbroken track record. The network does exactly what its code says it will do, every ten minutes, without exception.
What about Lightning?
The base Bitcoin network processes about 7 transactions per second. For everyday payments like buying coffee, that is slow and can be expensive when the network is busy. This is a real limitation.
The Lightning Network is a layer built on top of Bitcoin that enables near-instant, low-cost transactions. It works by opening payment channels between users. Transactions flow through these channels without touching the main blockchain until the channel is closed, at which point the final balances are settled on-chain.
Think of it like this: the Bitcoin blockchain is the settlement layer, like a bank wire. Lightning is the everyday payments layer, like a debit card. Both use real bitcoin. The blockchain handles large, final settlements. Lightning handles fast, small payments.
Lightning is still growing. It works well for its intended use case (small, fast payments), but it adds complexity. For most beginners, understanding the base layer is what matters first. Lightning becomes relevant when you want to use bitcoin for everyday spending rather than long-term holding.
Where to go from here
Now that you understand how Bitcoin works, here are the natural next steps depending on what you want to do.
Ready to Buy?
Now that you know how it works, take the next step. Our buying guide covers everything from choosing an exchange to setting up your first wallet.
How to Buy Bitcoin →