Bitcoin FAQ

Bitcoin is the first and largest cryptocurrency, launched in 2009 as a peer-to-peer digital cash system that works without banks. It runs on a public blockchain secured by mining, has a fixed cap of 21 million coins, and is widely treated as a store of value or digital gold.

Bitcoin was created by a person or group using the pseudonym Satoshi Nakamoto, who published its whitepaper in 2008 and released the software in 2009. Their real identity has never been confirmed, and the coins mined in Bitcoin's earliest days have never been moved.

Bitcoin's network went live on January 3, 2009, when Satoshi Nakamoto mined the first block, known as the genesis block. Its whitepaper had been published a few months earlier, in October 2008, during the global financial crisis.

Bitcoin's code permanently limits total supply to 21 million coins to make it scarce and resistant to inflation, unlike government money that can be printed at will. New coins enter slowly through mining rewards that shrink over time, and the last is expected around the year 2140.

Bitcoin halving is a scheduled event, roughly every four years or every 210,000 blocks, that cuts the reward miners receive for each new block in half. It steadily reduces the rate of new supply and is closely watched because it tightens issuance over time.

Bitcoin halving happens every 210,000 blocks, which averages about every four years. Past halvings occurred in 2012, 2016, 2020, and 2024, each cutting the block reward in half — from 50 coins originally down to 3.125 after the 2024 halving.

Bitcoin mining is the process where specialized computers compete to solve a difficult mathematical puzzle for the right to add the next block of transactions, earning newly created bitcoin plus fees. It secures the network by making attacks extremely expensive in electricity and hardware.

A Bitcoin transaction is typically included in a block within about 10 minutes on average, though busy periods and low fees can make it take longer. Many services wait for several confirmations, so fully settling a payment can take up to an hour.

Bitcoin fees rise when many people transact at once, because block space is limited and users bid higher fees to be included sooner. During calm periods fees are low, but during peak demand a single transaction can briefly cost many dollars.

The Lightning Network is a second layer built on top of Bitcoin that enables near-instant, very low-fee payments by settling most transactions off-chain and recording only the net result on the main blockchain. It is designed to make Bitcoin practical for small, everyday purchases.

The Bitcoin network itself has never been hacked and has run continuously since 2009, protected by its mining and cryptography. Almost all Bitcoin thefts come from compromised exchanges, phishing, or stolen private keys — failures around Bitcoin, not of the protocol itself.

A Bitcoin address is a string of letters and numbers used to receive coins, similar to an account number you can share freely. Modern addresses often start with bc1, and each is derived from your private key, which must stay secret to keep the funds safe.

Around 19.7 million of the 21 million total bitcoins had already been mined by 2026, leaving roughly 1.3 million still to be released. Because halvings keep slowing issuance, these remaining coins will trickle out gradually over the next hundred-plus years.

Once all 21 million bitcoins are mined, expected around 2140, miners will no longer earn newly created coins and will be paid entirely through transaction fees. The network is designed to keep operating on fee revenue alone after issuance ends.

Supporters argue Bitcoin is a strong store of value because of its fixed supply and independence from any government, while critics point to its sharp price swings. Whether it suits you depends on your goals and risk tolerance; this is general information, not financial advice.

A Bitcoin node is a computer running Bitcoin's software that keeps a full copy of the blockchain and independently checks that every transaction follows the rules. Thousands of nodes worldwide are what let the network operate without any central authority.

Bitcoin Cash split from Bitcoin in a 2017 hard fork over how to scale. Bitcoin Cash raised its block size to allow more transactions on-chain with lower fees, while Bitcoin kept smaller blocks and pursued scaling through layers like Lightning. They are now separate coins.

BTC dominance is Bitcoin's share of the total cryptocurrency market cap, expressed as a percentage. Traders watch it to gauge whether money is flowing into Bitcoin or into altcoins, since a falling dominance often signals rising interest in smaller coins.

Yes. Bitcoin is divisible to eight decimal places, with the smallest unit called a satoshi (0.00000001 BTC), so you can buy a tiny fraction. The high price of a whole coin doesn't stop you from owning a small amount.

Cold storage means keeping your Bitcoin private keys completely offline, typically on a hardware wallet or paper backup, so they can't be reached by online attackers. It is the standard way to secure large or long-term holdings against hacks and phishing.

The first known real-world Bitcoin purchase was in May 2010, when a programmer paid 10,000 BTC for two pizzas. The date is now celebrated each year as Bitcoin Pizza Day, and it illustrates how much the coin's value has changed since.

Bitcoin is called digital gold because, like gold, it is scarce, hard to produce, and not controlled by any government, making it a potential hedge against inflation. The comparison highlights its role as a store of value rather than as everyday spending money.

A Bitcoin block is a bundle of transactions added to the blockchain roughly every 10 minutes. Each block links to the previous one and includes the miner's reward, and once buried under later blocks its contents become effectively permanent.

Mining difficulty is a self-adjusting measure of how hard it is to find a new block. Bitcoin automatically raises or lowers it about every two weeks so that blocks keep arriving roughly every 10 minutes, regardless of how much mining power joins or leaves.

Bitcoin mining uses substantial electricity, which draws criticism over its carbon footprint, though a growing share comes from renewable or otherwise wasted energy. The debate weighs that energy use against the security it provides and how the power is actually sourced.

A hardware wallet is a small physical device that stores your Bitcoin private keys offline and signs transactions internally, so the keys never touch an internet-connected computer. It is one of the safest ways to hold Bitcoin against online theft.

Governments can restrict or ban Bitcoin within their borders, and some have, but the network itself keeps running globally as long as nodes and miners operate somewhere. Bans tend to push activity elsewhere rather than shut the network down, though they can sharply limit local access.

A UTXO, or unspent transaction output, is a chunk of bitcoin received but not yet spent, and your wallet balance is simply the sum of your UTXOs. When you pay, your wallet combines UTXOs as inputs and creates new ones, including any change, as outputs.

SegWit, short for Segregated Witness, was a 2017 upgrade that restructured how transaction data is stored, effectively increasing block capacity and fixing a technical flaw. It also paved the way for second-layer solutions like the Lightning Network.

In many countries Bitcoin is treated as property, so selling or spending it can trigger capital-gains tax on any increase in value, though rules vary widely. This is general information, not tax advice; check your local regulations or consult a professional.

A Bitcoin private key is a secret number that proves ownership of the coins at an address and authorizes spending them. Whoever holds it controls the funds, so it must be kept secret and backed up — losing it means the bitcoin is permanently inaccessible.

A 51% attack is where a single party gains control of most of a network's mining power and could reorder or reverse recent transactions. On Bitcoin this is considered impractically expensive given its enormous mining base, but smaller proof-of-work coins are more vulnerable.

Bitcoin's price is set purely by supply and demand across global markets, with no central issuer. It responds to factors like investor sentiment, regulation, macroeconomic conditions, and adoption news, which together make it far more volatile than traditional currencies.

A Bitcoin ETF is a regulated investment fund that tracks Bitcoin's price and trades on a stock exchange, letting investors gain exposure without holding the coin directly. Spot Bitcoin ETFs launched in the US in early 2024, broadening access for traditional investors.

Yes. Every Bitcoin transaction is permanently recorded on a public blockchain, so anyone can trace the flow of coins between addresses. Addresses aren't names, but they can often be linked to identities, especially through exchanges that verify their customers.

The mempool is the waiting area where valid Bitcoin transactions sit before a miner includes them in a block. When it is crowded, users raise fees to jump the queue, which is why fees spike during busy periods and fall when the mempool clears.

Satoshi Nakamoto gradually stepped back from Bitcoin around 2010 and 2011, handing off the project and then going silent, with no confirmed communication since. The reasons are unknown, but many see the absence of a founder as reinforcing Bitcoin's decentralized nature.

A paper wallet is a printed record of a Bitcoin address and its private key, kept entirely offline. It was an early cold-storage method, but it is now largely discouraged in favor of hardware wallets, since paper is easy to damage, lose, or expose when spending.

Dollar-cost averaging means buying a fixed amount of Bitcoin at regular intervals regardless of price, rather than trying to time the market. The approach smooths out volatility over time; it is a common strategy but not a guarantee against loss, and is not financial advice.

The Bitcoin network is secured by an enormous amount of global mining power and cryptography, and its core protocol has never been breached since 2009. Its security grows as more miners participate, making it the most battle-tested blockchain in operation.

A block reward is the newly created bitcoin plus transaction fees a miner earns for adding a block. The newly created portion halves every four years, so over time the reward relies increasingly on fees rather than on freshly issued coins.

A satoshi is the smallest unit of Bitcoin, equal to one hundred-millionth of a coin (0.00000001 BTC), named after its creator. It lets people transact in very small amounts, since one whole bitcoin is too valuable for tiny everyday payments.

Whether it is too late depends entirely on your own goals, timeframe, and risk tolerance, not on the current price. Bitcoin remains highly volatile with an uncertain future, so this is general information only and never a recommendation to buy or sell.

Taproot was a 2021 Bitcoin upgrade that improved privacy and efficiency, especially for complex transactions and smart contracts, by making them look like ordinary ones on-chain. It also reduced fees for certain transaction types and enhanced Bitcoin's scripting capabilities.

Store the bulk of your Bitcoin in a hardware or cold wallet, back up your seed phrase offline in more than one place, and never share your private keys. Most losses come from phishing, fake support, and reused passwords rather than from any weakness in Bitcoin itself.