Bitcoin is both a peer-to-peer digital payment network and the digital asset, bitcoin, that moves across it. The network records transactions on a shared public ledger; wallets manage the private keys that authorize spending, and miners help add valid transactions to that ledger. Bitcoin has no central bank or single central authority, but it is not anonymous or risk-free: payments can be difficult to reverse, self-custody requires careful key management, and the asset’s price can change unpredictably.
What is Bitcoin?
Bitcoin is a system for transferring value directly between participants over a peer-to-peer network. Its shared record of confirmed transactions is called the blockchain. The network’s rules are enforced by participating computers, called nodes, rather than by one central operator. Bitcoin.org’s FAQ for the press describes Bitcoin as a decentralized peer-to-peer network.
The word “Bitcoin” is used for both the network and its digital asset. The asset is commonly written as bitcoin, or BTC, while the network and protocol are often called Bitcoin. Bitcoin is not a file stored in a wallet app: a wallet manages keys, and the ledger determines which funds those keys can authorize spending.
How does Bitcoin work?
A typical on-chain payment follows this sequence:
- A wallet manages keys. The wallet creates or controls the cryptographic keys used to receive and spend bitcoin. It can generate an address for someone to pay.
- The sender signs a transaction. To spend funds, the wallet uses a private key to create a digital signature authorizing the transaction. The private key should remain secret.
- The transaction is broadcast. The signed transaction is sent to the peer-to-peer network, where nodes check whether it follows Bitcoin’s rules.
- A miner may include it in a block. Miners compete using proof of work to add a block of transactions to the chain. Nodes independently check that the proposed block follows the protocol.
- Confirmations accumulate. Once a transaction is included in a block, it has one confirmation. Each later block added on top counts as another confirmation and makes changing that transaction history more difficult.
This process is not an instant or guaranteed settlement. Bitcoin.org says blocks arrive about every 10 minutes on average; that is a network average, not a promise that a particular transaction will confirm within 10 minutes. Fees and demand for block space affect which transactions miners prioritize. Bitcoin.org’s FAQ explains block timing and confirmations.
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What mining does—and does not do
Mining is not literally digging coins out of the ground. It is a proof-of-work competition that helps order transactions and secure the ledger. Miners use computing power, often with specialized hardware, to propose blocks. The rest of the network checks those blocks against Bitcoin’s rules; miners cannot make an invalid transaction valid simply by including it. Bitcoin.org’s FAQ describes mining and block verification.
Fees, confirmation time, and Lightning
Bitcoin transaction fees vary with demand for space in blocks and the transaction’s data size; they do not simply increase in proportion to the amount of bitcoin sent. A fee quote can change as network demand changes. Bitcoin.org’s individual-user guide and FAQ discuss fees and transactions.
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Lightning is a payment layer built on Bitcoin for near-instant, low-cost small payments, while on-chain transactions are recorded on the blockchain. Actual experience depends on the payment and network conditions, so “near-instant” should not be read as a universal guarantee. Bitcoin.org’s guide introduces Lightning.
How do Bitcoin wallets work?
A wallet is software or a physical device that manages keys; it does not contain the bitcoin itself. A receiving address can be shared to accept a payment. The private key signs transactions that spend funds associated with the wallet. Recovery information, such as a backup phrase when the wallet uses one, can restore access and must be protected as carefully as the keys themselves. Bitcoin.org’s explanation of how Bitcoin works covers wallets, keys, and addresses.
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Wallet choices mainly differ in who controls the keys and who bears the responsibility for access and recovery:
| Arrangement | Who controls the keys? | Backup and recovery responsibility | Key trade-off |
|---|---|---|---|
| Self-custody wallet | You control the private keys. | You must protect keys and recovery information. | Direct control, with the risk that loss of access can mean permanent loss. |
| Custodial service | The service provider controls or manages access to the keys. | Access and withdrawals depend on the provider’s policies and systems. | Convenience, with third-party risks including security, solvency, and withdrawal restrictions. |
A hardware wallet is an optional physical device for managing keys in a self-custody setup. It is not required, does not eliminate risk, and cannot compensate for lost or exposed recovery information.
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Is Bitcoin anonymous?
No. Bitcoin’s ledger is public, and transaction histories associated with addresses can be viewed. An address does not automatically reveal a person’s name, but activity may sometimes be linked to real-world identities. Bitcoin therefore offers pseudonymity, not guaranteed anonymity. Bitcoin.org’s user guidance and individual-user guide discuss privacy and transaction records.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What can you use Bitcoin for?
Bitcoin.org describes several ways people may obtain bitcoin: accept it for goods or services, buy it through an exchange, or exchange directly with another person. Wallets are the interface for sending and receiving it. Availability, rules, and services vary by country, so these are general methods—not a recommendation of any exchange or a guarantee that a particular method is available where you live. See Bitcoin.org’s getting-started guide.
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Bitcoin.org also points readers to Satoshi Nakamoto’s original paper, “Bitcoin: A Peer-to-Peer Electronic Cash System.”
Bitcoin versus a spot Bitcoin ETP
Owning bitcoin in a wallet and buying a spot Bitcoin exchange-traded product (ETP) are different things. Bitcoin in a wallet is the digital asset held through control of keys or through a custodian. An ETP is a securities-market investment that provides exposure to Bitcoin’s price; an investor owns shares or units of the product, not bitcoin directly in a personal wallet.
| Question | Bitcoin held through a wallet | Spot Bitcoin ETP |
|---|---|---|
| What do you own? | Bitcoin, accessed through keys or a custodian. | Shares or units of an investment security providing Bitcoin exposure. |
| Who controls or holds the underlying bitcoin? | You control keys in self-custody, or a custodian holds or manages them. | The product’s structure involves custody arrangements; an investor does not personally control the underlying keys. |
| What risks remain? | Key loss or theft, custody risks if a provider is used, price volatility, and transaction irreversibility. | Bitcoin price exposure plus product, securities-market, and custody-related risks. |
On January 10, 2024, the U.S. Securities and Exchange Commission addressed approval of spot Bitcoin ETP listings. The SEC explicitly said that the approval did not endorse Bitcoin or the products’ arrangements, including custody arrangements. Its statement is about the U.S. securities context and should not be read as a general endorsement: SEC statement on the approval of spot Bitcoin exchange-traded products.
What are the main risks of Bitcoin?
- Price volatility: Bitcoin’s price can change unpredictably. Bitcoin.org cautions users to treat it as a high-risk asset. That is a risk description, not a recommendation to buy or sell.
- Loss of keys or recovery information: With self-custody, losing access can mean losing the ability to spend the bitcoin.
- Custodian risk: Using a third-party service means relying on its security, solvency, and withdrawal policies.
- Limited reversibility: A confirmed payment generally cannot be undone by a central authority. As Bitcoin.org puts it, “A Bitcoin transaction cannot be reversed, it can only be refunded by the person receiving the funds.” A refund depends on the recipient.
- Privacy limits: Public transaction records may be analyzed and linked to people.
- Changing legal and tax rules: Treatment depends on jurisdiction and personal circumstances. Check current local requirements and consult a qualified professional for advice about your situation.
Bitcoin.org’s overview of risks and user responsibilities is available in “Some things you need to know.”
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