Quick facts
- Bitcoin is digital money that runs on a public network of computers rather than a central authority.
- Total supply is capped at 21 million, which is enforced by code and independent nodes.
- New bitcoin enters circulation through mining with a block reward that halves roughly every four years.
- You typically buy Bitcoin on exchanges, then hold it in a wallet that you control.
| Attribute | At a glance |
|---|---|
| Launch | Network live since 2009 |
| Creator | Satoshi Nakamoto (pseudonym) |
| Consensus | Proof of Work via SHA-256 |
| Monetary policy | Fixed supply cap of 21,000,000 BTC |
| Average block time | ~10 minutes |
| Units | 1 BTC = 100,000,000 satoshis |
IMAGE: Conceptual map of the Bitcoin network, miners adding blocks, and nodes verifying rules.
Prompt for generator: “Clean, minimal infographic showing a decentralized Bitcoin network with miners finding blocks every ~10 minutes and independent nodes validating rules. Flat vector style, white background, Financial Times color palette, 1280×720 JPG.”
What is Bitcoin in one sentence
Bitcoin is an open monetary network where anyone can hold and transfer value without permission, with rules set and enforced by code and a large community of independent nodes.
How Bitcoin works
At the core of Bitcoin is a shared ledger called the blockchain. This ledger records batches of transactions in blocks that are linked together through cryptographic hashes. Miners compete to add the next block by expending computing power. The winning miner earns a block reward, which introduces new bitcoin into circulation, plus any transaction fees included by users. Every fully validating node checks the block against network rules, and only valid blocks are accepted.
This design produces a settlement layer that is resilient to single points of failure. Because thousands of nodes maintain their own copies of the ledger and verify the same rules, altering past transactions is economically and technically difficult. Finality grows with the number of confirmations as more blocks are added on top of a transaction.
VIDEO: Search YouTube for: “Bitcoin explained for beginners 10 minutes animation 2025”
Tip: Look for a concise explainer that covers blocks, miners, nodes, and confirmations with clear diagrams.
Supply, issuance, and halving
Bitcoin’s monetary policy is simple and transparent. The maximum supply is 21 million. Newly issued bitcoin comes from the block reward, which halves roughly every four years. The halving slows the pace of new supply until issuance trends toward zero. This predictable schedule is one reason Bitcoin is often described as digital scarcity.
| Era | Block reward (BTC) | Notes |
|---|---|---|
| 2009–2012 | 50 | Genesis to first halving |
| 2012–2016 | 25 | Second issuance era |
| 2016–2020 | 12.5 | Third era |
| 2020–2024 | 6.25 | Fourth era |
| 2024–~2028 | 3.125 | Current era |
IMAGE: Cumulative supply curve approaching 21 million with halving steps highlighted.
Prompt for generator: “Minimal step-chart showing Bitcoin issuance declining at halving events and cumulative supply asymptotically approaching 21,000,000. Clean grid, FT-style palette, labels for 2012, 2016, 2020, 2024, 2028 (estimated), 1280×720 JPG.”
Wallet types and which is safest
A wallet controls your private keys, which authorize spending. The safest choice for most long-term holders is a hardware wallet, because your private keys stay offline on a dedicated device. Other wallet types trade some security for convenience. You do not need to set up a wallet in detail to grasp the concept. The key point is that control of the private key equals control of the bitcoin.
| Wallet type | Custody | Internet exposure | Convenience | Best for | Relative safety |
|---|---|---|---|---|---|
| Hardware | You | Offline by default | Medium | Long-term holdings | Highest for most users |
| Mobile | You | Online on phone | High | Everyday spending | Moderate |
| Desktop | You | Online on computer | Medium | Active management | Moderate |
| Web/Custodial | Third party holds keys | Online service | Very high | Short-term access | Lower |
| Paper | You | Offline if generated safely | Low | Long-term cold storage for experts | High if done correctly, but error-prone |
IMAGE: Side-by-side visual of hardware, mobile, and custodial wallets with brief captions.
Prompt for generator: “Three-panel comparison graphic of Bitcoin wallet types: hardware device, smartphone wallet app, and custodial web account. Clean vector style, neutral background, short labels, 1280×720 JPG.”
Where you buy Bitcoin
You buy Bitcoin on exchanges. Centralized exchanges let you trade through an account with a familiar interface. Decentralized exchanges enable peer-to-peer swaps using your own wallet. Many users prefer a centralized platform for the first purchase, then move holdings to a personal wallet for longer-term storage.
| Exchange type | How it works | Strengths | Trade-offs |
|---|---|---|---|
| Centralized exchange (CEX) | Broker or order book matches buyers and sellers through an account | High liquidity, familiar UI, many payment methods | You rely on the platform for custody until you transfer out |
| Decentralized exchange (DEX) | Trades settle on the blockchain using your wallet | Self-custody, transparent settlement | Learning curve and variable liquidity depending on pair |
Fees and confirmations
When you transact on the Bitcoin network, you include a network fee that compensates miners for including your transaction in a block. Fees rise and fall based on demand for block space. Confirmation refers to how many blocks have been added after the block that contains your transaction. More confirmations increase assurance that the transaction is permanently recorded.
| Concept | Plain-English meaning | Why it matters |
|---|---|---|
| Network fee | Payment to miners to process your transaction | Higher fees can speed inclusion during busy periods |
| Confirmations | Blocks added after your transaction’s block | More confirmations increase settlement confidence |
On-chain vs Lightning
Bitcoin’s base layer is optimized for security and predictable settlement. The Lightning Network is an additional layer that enables faster and lower-cost transactions by routing payments through payment channels. Think of the base layer as final settlement and Lightning as a way to move smaller amounts efficiently. Many wallets support both, allowing you to choose based on the payment size and urgency.
Practical safekeeping tips
- Prefer a hardware wallet for long-term holdings so keys stay offline.
- Write down your recovery seed on paper and store it in a safe place. Avoid photographing or storing it in the cloud.
- Use a strong device passcode and keep wallet software up to date.
- Consider multi-signature for higher amounts if you are comfortable with more advanced setups.
- Test small amounts first when moving funds to confirm everything works as expected.
Mini-glossary
| Term | Short definition |
|---|---|
| Blockchain | A chain of blocks that records transactions in order |
| Miner | A participant who expends computing power to add blocks and earn rewards |
| Node | Software that verifies rules and relays valid transactions and blocks |
| Private key | Secret that authorizes spending |
| Public key / Address | Identifier others use to send you bitcoin |
| Halving | Scheduled reduction of the block reward roughly every four years |
| Satoshi | Smallest unit of bitcoin, one hundred millionth of a BTC |
| Confirmation | Blocks added after the one that includes your transaction |
IMAGE: Simple diagram of a Bitcoin transaction moving from the mempool into a mined block.
Prompt for generator: “Illustration of a mempool queue feeding into a newly mined Bitcoin block, with arrows and short labels, flat vector, neutral tones, 1280×720 JPG.”