Frequently Asked Questions

Bitcoin is a consensus network that enables a new payment system and a completely digital money. It is the first decentralized peer-to-peer payment network that is powered by its users with no central authority or middlemen. From a user perspective, Bitcoin is like cash for the Internet.

The first Bitcoin specification and proof of concept was published in 2009 by an unknown individual under the pseudonym Satoshi Nakamoto. Satoshi left the project in late 2010 without revealing much about himself. The community has since grown exponentially with many developers working on Bitcoin.

Satoshi's anonymity often raises concerns, many of which are linked to misunderstanding of Bitcoin's open-source nature. The Bitcoin protocol and software are published openly and any developer around the world can review the code or make their own modified version. As such, the identity of Bitcoin's inventor is probably as relevant today as the identity of the person who invented paper.

Nobody owns the Bitcoin network much like no one owns the technology behind email. Bitcoin is controlled by all Bitcoin users around the world. While developers are improving the software, they cannot force a change in the Bitcoin protocol because all users are free to choose what software and version they use. In order to stay compatible with each other, all users need to use software complying with the same rules. Bitcoin can only work correctly with a complete consensus among all users.

From a user perspective, Bitcoin is nothing more than a mobile app or computer program that provides a personal Bitcoin wallet and allows a user to send and receive bitcoins. This is how Bitcoin works for most users.

Behind the scenes, the Bitcoin network is sharing a public ledger called the "blockchain." This ledger contains every transaction ever processed, allowing a user's computer to verify the validity of each transaction. The authenticity of each transaction is protected by digital signatures corresponding to the sending addresses, allowing all users to have full control over sending bitcoins from their own Bitcoin addresses. In addition, anyone can process transactions using the computing power of specialized hardware and earn a reward in bitcoins for this service. This is often called mining.

Yes. Bitcoin is used by millions of people and businesses worldwide. Major companies accept Bitcoin payments, multiple countries have established regulatory frameworks for it, and El Salvador adopted it as legal tender in 2021. Spot Bitcoin ETFs launched in the United States in 2024, bringing institutional investors into the market. The Lightning Network enables fast, low-cost payments for everyday purchases at a growing number of merchants.

There are several ways to get bitcoins:

• As payment for goods or services.
• Purchase bitcoins at a Bitcoin exchange.
• Exchange bitcoins with someone near you.
• Earn bitcoins through competitive mining.

Bitcoin payments are easier to make than debit or credit card purchases and can be received without a merchant account. Payments are made from a wallet application, either on your computer or smartphone, by entering the recipient's address, the payment amount, and pressing send. To make it easier to enter a recipient's address, many wallets can obtain the address by scanning a QR code or touching two phones together with NFC technology.

• Payment freedom: Send and receive any amount of money instantly anywhere in the world at any time. No bank holidays. No borders. No imposed limits.
• Very low fees: Bitcoin payments are processed with either no fees or extremely small fees. Merchant processors can offer services for much lower fees than PayPal or credit card networks.
• Fewer risks for merchants: Bitcoin transactions are secure, irreversible, and do not contain customers' sensitive or personal information, protecting merchants from fraud and chargebacks.
• Security and control: Bitcoin users are in full control of their transactions. Bitcoin payments can be made without personal information tied to the transaction, offering strong protection against identity theft.
• Transparent and neutral: All information concerning the Bitcoin money supply is readily available on the blockchain for anybody to verify and use in real time.

• Volatility: Bitcoin's price can fluctuate significantly over short periods, making it challenging as a unit of account for everyday pricing. Volatility has decreased over time as the market has matured, but it remains higher than traditional currencies.
• User responsibility: Being your own bank means you are responsible for securing your private keys. Losing access to your keys means losing your bitcoin permanently, with no customer support to call. This requires a learning curve around wallets, backups, and security practices.
• Regulatory uncertainty: While many countries have established clear frameworks, regulations continue to evolve and vary significantly across jurisdictions, creating complexity for businesses and users operating internationally.

Much of the trust in Bitcoin comes from the fact that it requires no trust at all. Bitcoin is fully open-source and decentralized. This means that anyone has access to the entire source code at any time. Any developer in the world can therefore verify exactly how Bitcoin works. All transactions and bitcoins issued into existence can be transparently consulted in real time by anyone. All payments can be made without reliance on a third party and the whole system is protected by heavily peer-reviewed cryptographic algorithms like those used for online banking. No organization or individual can control Bitcoin, and the network remains secure even if not all of its users can be trusted.

You should never expect to get rich with Bitcoin or any emerging technology. It is always important to be wary of anything that sounds too good to be true or disobeys basic economic rules.

Bitcoin is a growing space of innovation and there are business opportunities that also include risks. There is no guarantee that Bitcoin will continue to grow even though it has developed at a very fast rate so far. Investing time and resources on anything related to Bitcoin requires entrepreneurship.

Bitcoin is as virtual as the credit cards and online banking networks people use every day. Bitcoin can be used to pay online and in physical stores just like any other form of money. Bitcoin balances are stored in a large distributed network, and they cannot be fraudulently altered by anybody. In other words, Bitcoin users have exclusive control over their funds and bitcoins cannot vanish just because they are virtual.

Bitcoin is pseudonymous, not anonymous. Every transaction is permanently recorded on the public blockchain, and while addresses are not directly tied to real-world identities, chain analysis companies can often trace transaction flows and link addresses to individuals, especially when combined with exchange KYC data.

Privacy-enhancing techniques exist (such as CoinJoin, the Lightning Network, and careful UTXO management), but using them effectively requires knowledge and effort. For most users, Bitcoin provides less financial privacy than cash but more than traditional bank transfers or credit cards.

When a user loses their wallet, it has the effect of removing money out of circulation. Lost bitcoins still remain in the blockchain just like any other bitcoins. However, lost bitcoins remain dormant forever because there is no way for anybody to find the private key(s) that would allow them to be spent again. Because of the law of supply and demand, when fewer bitcoins are available, the ones that are left will be in higher demand and increase in value to compensate.

Bitcoin scales through a layered approach. The base layer (the blockchain) processes roughly 7 transactions per second, prioritizing security and decentralization. On top of this, the Lightning Network handles fast, high-volume payments by settling transactions off-chain, with only the opening and closing of payment channels recorded on the blockchain. SegWit (activated in 2017) and Taproot (activated in 2021) both increased the effective capacity of the base layer. This layered architecture is similar to how the internet itself works: TCP/IP handles the base layer while applications like the web are built on top.

Bitcoin is legal in most countries, though regulations vary widely. El Salvador adopted Bitcoin as legal tender in 2021. The United States approved spot Bitcoin ETFs in 2024 and treats Bitcoin as property for tax purposes. The European Union established a comprehensive regulatory framework through MiCA (Markets in Crypto-Assets) in 2024. A small number of countries, including China, have banned cryptocurrency trading, while most others permit it under varying degrees of regulation.

Bitcoin is money, and money has always been used both for legal and illegal purposes. Cash, credit cards, and current banking systems widely surpass Bitcoin in terms of their use to finance crime. Bitcoin can bring significant innovation in payment systems, and the benefits of such innovation are often considered to be far beyond their potential drawbacks.

Bitcoin is designed to be a huge step forward in making money more secure and could also act as a significant protection against many forms of financial crime. For instance, bitcoins are completely impossible to counterfeit. Users are in full control of their payments and cannot receive unapproved charges such as with credit card fraud. Bitcoin transactions are irreversible and immune to fraudulent chargebacks.

The Bitcoin protocol itself cannot be modified without the cooperation of nearly all its users, who choose what software they use. Attempting to assign special rights to a local authority in the rules of the global Bitcoin network is not a practical possibility.

It is, however, possible to regulate the use of Bitcoin in a similar way to any other instrument. Just like the dollar, Bitcoin can be used for a wide variety of purposes, some of which can be considered legitimate or not as per each jurisdiction's laws. In this regard, Bitcoin is no different than any other tool or resource and can be subjected to different regulations in each country.

In most jurisdictions, Bitcoin is subject to tax. The United States treats Bitcoin as property, meaning capital gains tax applies when you sell or spend it. Many other countries have similar frameworks. Tax liability can arise from selling Bitcoin, using it to purchase goods, earning it as income, or mining it. The specific rules vary by country, so consult a tax professional familiar with cryptocurrency in your jurisdiction.

Bitcoin is freeing people to transact on their own terms. Each user can send and receive payments in a similar way to cash but they can also take part in more complex contracts. Multiple signatures allow a transaction to be accepted by the network only if a certain number of a defined group of persons agree to sign the transaction. This allows innovative dispute mediation services to be developed in the future.

It is also worth noting that while merchants usually depend on their public reputation to remain in business and pay their employees, they don't have access to the same level of information when dealing with new consumers. The way Bitcoin works allows both individuals and businesses to be protected against fraudulent chargebacks while giving the choice to the consumer to ask for more protection when they are not willing to trust a particular merchant.

New bitcoins are generated by a competitive and decentralized process called "mining." Bitcoin miners process transactions and secure the network using specialized hardware, earning newly created bitcoins as a reward.

The Bitcoin protocol creates new bitcoins at a predictable rate that halves approximately every four years. The most recent halving occurred in April 2024, reducing the block reward to 3.125 BTC. This process will continue until the hard cap of 21 million bitcoins is reached, expected around the year 2140. At that point, miners will be supported exclusively by transaction fees.

Bitcoins have value because they are useful as a form of money. Bitcoin has the characteristics of money (durability, portability, fungibility, scarcity, divisibility, and recognizability) based on the properties of mathematics rather than relying on physical properties (like gold and silver) or trust in central authorities (like fiat currencies). In short, Bitcoin is backed by mathematics. With these attributes, all that is required for a form of money to hold value is trust and adoption.

The price of a bitcoin is determined by supply and demand. When demand for bitcoins increases, the price increases, and when demand falls, the price falls. There is only a limited number of bitcoins in circulation and new bitcoins are created at a predictable and decreasing rate, which means that demand must follow this level of inflation to keep the price stable. Bitcoin's market capitalization now exceeds $1 trillion and liquidity has deepened significantly with the launch of spot ETFs and institutional participation, though prices can still be volatile.

Yes. History is littered with currencies that failed and are no longer used, such as the German Mark during the Weimar Republic and, more recently, the Zimbabwean dollar. Although previous currency failures were typically due to hyperinflation of a kind that Bitcoin makes impossible, there is always potential for technical failures, competing currencies, political issues, and so on. As a basic rule of thumb, no currency should be considered absolutely safe from failures or hard times. Bitcoin has proven reliable for years since its inception and there is a lot of potential for Bitcoin to continue to grow. However, no one is in a position to predict what the future will be for Bitcoin.

A fast rise in price does not constitute a bubble. An artificial over-valuation that will lead to a sudden downward correction constitutes a bubble. Choices based on individual human action by hundreds of thousands of market participants is the cause for bitcoin's price to fluctuate as the market seeks price discovery. Reasons for changes in sentiment may include a loss of confidence in Bitcoin, a large difference between value and price not based on the fundamentals of the Bitcoin economy, increased press coverage stimulating speculative demand, fear of uncertainty, and old-fashioned irrational exuberance and greed.

A Ponzi scheme is a fraudulent investment operation that pays returns to its investors from their own money, or the money paid by subsequent investors, instead of from profit earned by the individuals running the business. Ponzi schemes are designed to collapse at the expense of the last investors when there are not enough new participants.

Bitcoin is a free software project with no central authority. Consequently, no one is in a position to make fraudulent representations about investment returns. Like other major currencies such as gold, United States dollar, euro, yen, etc., there is no guaranteed purchasing power and the exchange rate floats freely. This leads to volatility where owners of bitcoins can unpredictably make or lose money. Beyond speculation, Bitcoin is also a payment system with useful and competitive attributes that are used by millions of people and businesses worldwide.

Some early adopters have large numbers of bitcoins because they took risks and invested time and resources in an unproven technology that was hardly used by anyone and that was much harder to secure properly. Many early adopters spent large numbers of bitcoins quite a few times before they became valuable or bought only small amounts and didn't make huge gains. There is no guarantee that the price of a bitcoin will increase or drop. This is very similar to investing in an early startup that can either gain value through its usefulness and popularity, or just never break through.

Bitcoin is unique in that only 21 million bitcoins will ever be created. However, this will never be a limitation because transactions can be denominated in smaller sub-units of a bitcoin, such as bits (there are 1,000,000 bits in 1 bitcoin). Bitcoins can be divided up to 8 decimal places (0.000 000 01) and potentially even smaller units if that is ever required in the future as the average transaction size decreases.

The deflationary spiral theory says that if prices are expected to fall, people will move purchases into the future in order to benefit from the lower prices. That fall in demand will in turn cause merchants to lower their prices to try and stimulate demand, making the problem worse and leading to an economic depression.

Although this theory is a popular way to justify inflation amongst central bankers, it does not appear to always hold true and is considered controversial amongst economists. Consumer electronics is one example of a market where prices constantly fall but which is not in depression. Similarly, the value of bitcoins has risen over time and yet the size of the Bitcoin economy has also grown dramatically along with it.

Bitcoin is not designed to be a deflationary currency. It is more accurate to say Bitcoin is intended to inflate in its early years, and become stable in its later years. The only time the quantity of bitcoins in circulation will drop is if people carelessly lose their wallets by failing to make backups.

This is a chicken-and-egg situation. For bitcoin's price to stabilize, a large-scale economy needs to develop with more businesses and users. For a large-scale economy to develop, businesses and users will seek price stability.

Fortunately, volatility does not affect the main benefits of Bitcoin as a payment system to transfer money from point A to point B. It is possible for businesses to convert bitcoin payments to their local currency instantly, allowing them to profit from the advantages of Bitcoin without being subjected to price fluctuations.

Only a fraction of bitcoins issued to date are found on the exchange markets for sale. Bitcoin markets are competitive, meaning the price of a bitcoin will rise or fall depending on supply and demand. Additionally, new bitcoins will continue to be issued for decades to come. Therefore even the most determined buyer could not buy all the bitcoins in existence. This situation isn't to suggest, however, that the markets aren't vulnerable to price manipulation; it still doesn't take significant amounts of money to move the market price up or down, and thus Bitcoin remains a volatile asset.

That can happen. For now, Bitcoin remains by far the most popular decentralized virtual currency, but there can be no guarantee that it will retain that position. There is already a set of alternative currencies inspired by Bitcoin. It is, however, probably correct to assume that significant improvements would be required for a new currency to overtake Bitcoin in terms of established market, even though this remains unpredictable. Bitcoin could also conceivably adopt improvements of a competing currency so long as it doesn't change fundamental parts of the protocol.

On the Bitcoin blockchain, there is a 10-minute delay on average before the network begins to confirm your transaction by including it in a block. For larger amounts, waiting for 6 confirmations (about an hour) is standard practice, as each confirmation exponentially decreases the probability of a reversal.

For everyday payments, the Lightning Network eliminates this wait entirely, enabling near-instant settlement. Many wallets and merchants now support Lightning for faster, lower-cost transactions.

Transaction fees are used as a protection against users sending transactions to overload the network. The fee is not related to the amount of bitcoins being sent; it is defined by attributes such as the size of the transaction data. If your activity follows the pattern of conventional transactions, the fees should remain very low.

The Lightning Network offers an alternative for smaller, everyday payments with significantly lower fees.

This works fine. The bitcoins will appear next time you start your wallet application. Bitcoins are not actually received by the software on your computer; they are appended to a public ledger that is shared between all the devices on the network. If you are sent bitcoins when your wallet client program is not running and you later launch it, it will download blocks and catch up with any transactions it did not already know about, and the bitcoins will eventually appear as if they were just received in real time. Your wallet is only needed when you wish to spend bitcoins.

Long synchronization time is only required with full node clients like Bitcoin Core. Technically speaking, synchronizing is the process of downloading and verifying all previous Bitcoin transactions on the network. For some Bitcoin clients to calculate the spendable balance of your Bitcoin wallet and make new transactions, it needs to be aware of all previous transactions. This step can be resource intensive and requires sufficient bandwidth and storage to accommodate the full size of the blockchain.

Mining is the process of spending computing power to process transactions, secure the network, and keep everyone in the system synchronized together. It can be perceived like the Bitcoin data center except that it has been designed to be fully decentralized with miners operating in all countries and no individual having control over the network. This process is referred to as "mining" as an analogy to gold mining because it is also a temporary mechanism used to issue new bitcoins. Unlike gold mining, however, Bitcoin mining provides a reward in exchange for useful services required to operate a secure payment network. Mining will still be required after the last bitcoin is issued.

Anybody can become a Bitcoin miner by running software with specialized hardware. Mining software listens for transactions broadcast through the peer-to-peer network and performs appropriate tasks to process and confirm these transactions. Bitcoin miners perform this work because they can earn transaction fees paid by users for faster transaction processing, and newly created bitcoins issued into existence according to a fixed formula.

For new transactions to be confirmed, they need to be included in a block along with a mathematical proof of work. Such proofs are very hard to generate because there is no way to create them other than by trying billions of calculations per second. This requires miners to perform these calculations before their blocks are accepted by the network and before they are rewarded. As more people start to mine, the difficulty of finding valid blocks is automatically increased by the network to ensure that the average time to find a block remains equal to 10 minutes.

Spending energy to secure and operate a payment system is hardly a waste. Like any other payment service, the use of Bitcoin entails processing costs. Services necessary for the operation of currently widespread monetary systems, such as banks, credit cards, and armored vehicles, also use a lot of energy. Unlike Bitcoin, their total energy consumption is not transparent and cannot be as easily measured.

Bitcoin mining increasingly uses renewable energy sources, including hydroelectric, solar, wind, and geothermal power. Miners are economically incentivized to seek the cheapest energy available, which often means using stranded or surplus renewable energy that would otherwise be wasted. Some mining operations also capture and burn methane gas that would otherwise be vented into the atmosphere, turning an environmental liability into a productive use.

Mining creates the equivalent of a competitive lottery that makes it very difficult for anyone to consecutively add new blocks of transactions into the blockchain. This protects the neutrality of the network by preventing any individual from gaining the power to block certain transactions. This also prevents any individual from replacing parts of the blockchain to roll back their own spends, which could be used to defraud other users. Mining makes it exponentially more difficult to reverse a past transaction by requiring the rewriting of all blocks following that transaction.

In the early days of Bitcoin, anyone could find a new block using their computer's CPU. As more and more people started mining, the difficulty of finding new blocks increased greatly to the point where the only cost-effective method of mining today is using specialized hardware (ASICs). See our mining guide for details on current hardware and how to get started.

The Bitcoin technology, the protocol and the cryptography, has a strong security track record, and the Bitcoin network is probably the biggest distributed computing project in the world. Bitcoin's most common vulnerability is in user error. Bitcoin wallet files that store the necessary private keys can be accidentally deleted, lost, or stolen. This is pretty similar to physical cash stored in a digital form. Fortunately, users can employ sound security practices to protect their money or use service providers that offer good levels of security and insurance against theft or loss.

The rules of the protocol and the cryptography used for Bitcoin are still working years after its inception, which is a good indication that the concept is well designed. However, security flaws have been found and fixed over time in various software implementations. Like any other form of software, the security of Bitcoin software depends on the speed with which problems are found and fixed.

There are often misconceptions about thefts and security breaches that happened on diverse exchanges and businesses. Although these events are unfortunate, none of them involve Bitcoin itself being hacked, nor imply inherent flaws in Bitcoin; just like a bank robbery doesn't mean that the dollar is compromised.

It is not possible to change the Bitcoin protocol that easily. Any Bitcoin client that doesn't comply with the same rules cannot enforce their own rules on other users. As per the current specification, double spending is not possible on the same blockchain, and neither is spending bitcoins without a valid signature.

However, powerful miners could arbitrarily choose to block or reverse recent transactions. A majority of users can also put pressure for some changes to be adopted. Because Bitcoin only works correctly with a complete consensus between all users, changing the protocol can be very difficult and requires an overwhelming majority of users to adopt the changes.

Yes, most systems relying on cryptography are, including traditional banking systems. Quantum computers exist today (built by IBM, Google, and others), but they are far from powerful enough to break the elliptic curve cryptography that Bitcoin uses. Experts estimate that a quantum computer capable of threatening Bitcoin's security is likely decades away.

In the event that quantum computing becomes a practical threat, the Bitcoin protocol could be upgraded to use post-quantum cryptographic algorithms. Bitcoin developers are already researching these approaches. Given the importance of such an update, it would be extensively reviewed and widely adopted.

You can find comprehensive lists of resources at bitcoin.page and lightning.how. We also recommend our Bitcoin glossary for key terms and definitions.

Feel free to ask questions on the Bitcoin Beginners subreddit, the Bitcoin Stack Exchange, or check out the latest Bitcoin news on our site.