What Is Bitcoin and Cryptocurrency? A Beginner's Guide

Bitcoin is a digital currency that lets people send money to each other over the internet without a bank in the middle. Every payment is recorded on a public ledger called a blockchain, which thousands of independent computers keep in sync, and the rules cap the supply at 21 million coins. Cryptocurrency is the wider family of digital assets that Bitcoin started. Coinfolytics tracks more than 18,000 of them, from Ethereum to dollar-pegged stablecoins.

If you've heard about Bitcoin a hundred times but never had it explained without jargon, this guide is for you. It covers what crypto is, how Bitcoin actually works, how it differs from the money in your bank account, how people buy and store it, and the risks you shouldn't skip. Figures are as of September 2026 unless we say otherwise.

Key takeaways

• Bitcoin launched on January 3, 2009. Its creator used the name Satoshi Nakamoto, and nobody knows who that is.
• Only 21 million bitcoin will ever exist. Just over 20 million have been created so far; the 20 millionth was mined in March 2026.
• No company or government runs it. A global network of computers checks every transaction against the same public rules.
• "Cryptocurrency" covers a lot of different things, from Bitcoin to Ethereum (a platform for apps) and stablecoins (tokens that track the US dollar).
• It's volatile, and scams are common. Bitcoin trades about a third below its October 2025 record, and Americans reported more than $11 billion in crypto-related fraud losses in 2025.

What is cryptocurrency?

A cryptocurrency is digital money that isn't issued by a bank or a government. Instead of one institution keeping the books, the records live on a blockchain: a shared ledger that many computers hold copies of and update together. Cryptography, the "crypto" in the name, makes sure only the owner of the coins can spend them and that nobody can quietly edit the history.

Most cryptocurrencies have three things in common:

• They're purely digital. There's no physical coin. A bitcoin is an entry on the ledger saying that a certain address controls a certain amount.
• The ledger is public. Anyone can look up every transaction, although accounts show up as addresses rather than names.
• You control them with a key. A private key, a long secret number, is what authorizes a payment. Whoever holds the key controls the coins.

Bitcoin was the first cryptocurrency, and thousands followed. On September 24, 2026, the whole market was worth about $2.9 trillion on the Coinfolytics live prices page, and Bitcoin alone made up roughly 59% of it.

What is Bitcoin?

Bitcoin (BTC) is the first and largest cryptocurrency: a digital currency with a fixed supply that runs on its own open network. It was described in a nine-page white paper, Bitcoin: A Peer-to-Peer Electronic Cash System, published on October 31, 2008 under the name Satoshi Nakamoto. The network went live on January 3, 2009, when the first block, known as the genesis block, was mined. Satoshi stopped communicating publicly around 2011, and their real identity has never been confirmed.

Satoshi left a message inside that first block: the front-page headline of The Times of London that day, about the UK government preparing a second bailout for the banks. Many people read it as a note on why Bitcoin exists, money that doesn't depend on anyone rescuing a bank.

For its first year, bitcoin had no real price at all. The first famous purchase came on May 22, 2010, when a programmer named Laszlo Hanyecz paid 10,000 BTC for two pizzas. The crypto world still celebrates that date as Bitcoin Pizza Day. At the September 2026 price of about $84,000, those two pizzas cost the equivalent of roughly $840 million.

Bitcoin at a glance

How does Bitcoin work?

You don't need to understand the math to use Bitcoin, but knowing its four moving parts makes everything else, from wallets to fees to risks, easier to follow.

1. The blockchain: a public ledger

Every Bitcoin transaction ever made is stored on the blockchain. Transactions are grouped into blocks, and each block contains a cryptographic fingerprint, called a hash, of the block before it. Change a single old transaction and its fingerprint changes, which breaks every block that came after it. That chain of fingerprints is what makes Bitcoin's history practically impossible to rewrite.

2. Keys and addresses: how you own bitcoin

Owning bitcoin really means holding the private key that can move it. From that key, your wallet creates public addresses that you can give to anyone who wants to pay you, a bit like an account number. When you send bitcoin, your wallet signs the transaction with your private key, and the network can check that signature without ever seeing the key itself.

3. Mining: how new blocks get added

Miners are computers competing to add the next block. To win, a miner has to find a number that gives the block a hash below a target, and the only way to find it is to guess, trillions of times a second. This is called proof of work. The winner earns newly created bitcoin (3.125 BTC per block today) plus the fees paid by the transactions in that block. Every 2,016 blocks, roughly every two weeks, the network adjusts the difficulty so that blocks keep arriving about every 10 minutes, however many miners join or leave.

4. Nodes: the rule keepers

Thousands of computers called nodes keep a full copy of the blockchain and check every new block against the same rules: no spending coins you don't have, no spending the same coin twice, and no creating more bitcoin than the schedule allows. A block that breaks a rule gets rejected, no matter who mined it. That's why no company, miner or government can simply print more bitcoin.

A bitcoin payment, step by step

1. Maria wants to send 0.01 BTC to Sam, so Sam gives her one of his addresses.
2. Maria's wallet creates the transaction, signs it with her private key and broadcasts it to the network.
3. Nodes check the signature and confirm that Maria's coins haven't already been spent.
4. A miner includes the transaction in a new block, usually within minutes if Maria's fee is in line with what others are paying.
5. Every block added on top counts as another confirmation. After a few confirmations, the payment is effectively permanent. There's no chargeback and no undo button.

Why will there only ever be 21 million bitcoin?

Bitcoin's supply is capped by its code: the reward for mining a block halves every 210,000 blocks, roughly every four years, so new supply shrinks toward zero. Each of these cuts is called a halving. The reward started at 50 BTC per block in 2009 and has been cut four times since.

Today, about 450 new bitcoin are created each day. More than 95% of all the bitcoin that will ever exist is already in circulation, and the last tiny fraction should be mined around the year 2140. After that, miners will be paid only through transaction fees; our piece on Bitcoin after 2140 looks at what that means for the network.

The usable supply is smaller than the headline number, too. Coins whose keys are lost can never move again, and Chainalysis estimated back in 2020 that around 3.7 million BTC hadn't moved in at least five years and were probably lost for good. That fixed, predictable, shrinking supply is the main reason people call Bitcoin "digital gold".

How is Bitcoin different from regular money?

The clearest way to see what Bitcoin is, and isn't, is to put it next to the dollars in a bank account.

Neither one is simply better. Bitcoin swaps convenience and consumer protection for independence: nobody can freeze it or print more of it, but nobody will rescue you if you make a mistake, either.

Bitcoin vs. other cryptocurrencies

Any cryptocurrency that isn't Bitcoin is often called an altcoin. Most of them fall into a handful of groups.

Ethereum

Ethereum launched on July 30, 2015 as a programmable blockchain. Developers write "smart contracts", programs that run on the network, to build apps for lending, trading, games and NFTs, and its currency, ether (ETH), pays for that computing. On September 15, 2022, in an upgrade known as the Merge, Ethereum switched from mining to proof of stake, where validators lock up ETH instead of burning electricity. That cut its energy use by about 99.95%.

Stablecoins

Stablecoins try to hold a steady value, almost always $1, by keeping reserves such as cash and short-term US Treasury bills. They're the plumbing of crypto trading and are used more and more for payments and cross-border transfers. The total supply of stablecoins is around $300 billion. In the US, the GENIUS Act, signed on July 18, 2025, created the first federal rules for payment stablecoins, including what their reserves must hold.

Everything else

Most of the thousands of smaller tokens won't survive. On a typical day, the Top Losers list on the Coinfolytics market page includes tokens that have dropped more than 90% in 24 hours. The further you move from the largest, most established coins, the more careful you need to be.

What can you actually do with cryptocurrency?

• Hold it as a long-term asset. Many people keep a small part of their savings in Bitcoin, betting that a scarce, global asset will hold its value over time. In the US you can also get Bitcoin exposure in an ordinary brokerage account: the SEC approved the first spot Bitcoin ETFs on January 10, 2024, and they started trading the next day.
• Send money across borders. A bitcoin or stablecoin transfer settles the same way on a Sunday night as on a Monday morning, whether it's going next door or to another continent.
• Pay and get paid. Some merchants and freelancers accept crypto, and stablecoins are popular for payments because their price doesn't swing.
• Use financial apps without a bank. On networks like Ethereum, people lend, borrow and trade directly through smart contracts. This is known as decentralized finance, or DeFi.

About one in five US adults (19%) say they have ever invested in, traded or used a cryptocurrency, according to a Pew Research Center survey from January 2026. Among men aged 18 to 29, it's 38%.

How to buy your first bitcoin

Buying crypto is much easier than it used to be, but the order of the steps matters. This is the path most beginners take:

1. Choose a reputable exchange. Look for one that's licensed or registered where you live, has a long track record and publishes proof of its reserves. Our exchange rankings compare trust scores and trading volume.
2. Verify your identity. Regulated exchanges have to confirm who you are before you can buy, a process called "know your customer" (KYC). Expect to upload an ID and a selfie.
3. Add money. A bank transfer is usually cheaper than a card. Check the fees before you confirm anything.
4. Start small. You don't have to buy a whole bitcoin. At about $84,000 per coin, $50 buys roughly 0.0006 BTC, or around 59,000 satoshis.
5. Decide where to keep it. Leaving coins on the exchange is convenient. Moving them to your own wallet means nobody else controls them. More on that below.
6. Record every purchase. Note the date, the amount, the price and the fee. You'll need them to know your real profit or loss and, in many countries, for your taxes. A free Coinfolytics account keeps this for you: log each buy and sell, and it shows your average cost and your profit or loss on every coin.

Where to store crypto: wallets explained

A crypto wallet doesn't actually hold coins; it holds the keys that control them. The coins always stay on the blockchain. What changes from one type of wallet to another is who holds the keys and how exposed they are to the internet.

When you set up a wallet of your own, it shows you a seed phrase, usually 12 or 24 words. Those words can recreate your keys in any compatible wallet, so write them down on paper, store them somewhere safe, and never type them into a website, a chat or a form. Anyone who asks for your seed phrase is trying to rob you. For a complete checklist, read our guide on how to secure your Bitcoin wallet, and if you are weighing up a device, our guide to hardware wallets explains how they work.

The risks to understand before you buy

Big price swings

Bitcoin hit a record of about $126,000 on October 6, 2025. In September 2026 it trades around $84,000, roughly a third lower less than a year later. In 2022 it lost about 64% of its value over the year. Smaller coins can move far more than that. Only put in money you could live with seeing cut in half, or worse.

Scams

Fraudsters love crypto because payments can't be reversed. The FBI's Internet Crime Complaint Center received 181,565 complaints involving cryptocurrency in 2025, with reported losses of more than $11 billion, according to its 2025 Internet Crime Report. Fake investment platforms caused the biggest losses. Watch out for these warning signs:

• Someone you met online, often on a dating app or social media, steers you toward a crypto platform that "can't lose".
• Guaranteed returns, or pressure to invest before some deadline.
• Giveaways that promise to double any crypto you send them.
• Anyone asking for your seed phrase or private key, including people claiming to be support staff.
• Being told to pay a "tax" or "release fee" before you can withdraw your own money.

Many of the largest frauds in crypto history followed the same script. Our guide to the biggest Bitcoin Ponzi schemes covers them and how to avoid them.

Platform failures

When you leave coins on an exchange, you're relying on that company. FTX, then one of the biggest exchanges in the world, filed for bankruptcy on November 11, 2022, and its customers' withdrawals were frozen. The Bitcoin network itself kept running normally the whole time; what failed was the company holding people's coins.

Mistakes you can't undo

Send coins to the wrong address or lose your seed phrase, and there's no bank to call. Double-check every address, send a small test amount first, and keep your backups somewhere safe.

It's no surprise many people are wary. In a 2024 Pew survey, 63% of Americans said they had little or no confidence that current ways to invest in, trade or use cryptocurrency are reliable and safe.

Is Bitcoin legal, and how is it taxed?

Bitcoin is legal to own in most countries, including the United States, the United Kingdom and the members of the European Union, though the rules vary a lot. China, on the other hand, declared all cryptocurrency transactions illegal in September 2021. The EU's Markets in Crypto-Assets regulation (MiCA) has applied in full since December 30, 2024, and the US passed its stablecoin law in 2025.

In the US, the IRS treats cryptocurrency as property, not currency. Selling it, swapping one coin for another or spending it can create a taxable capital gain or loss: the difference between what you paid (your cost basis) and what you got. Starting with 2025 transactions, exchanges and other brokers report your sales to the IRS on the new Form 1099-DA, and from 2026 they also report the cost basis of coins you bought on their platform. Other countries have their own rules, so check with a tax professional where you live.

Crypto glossary: key terms in plain English

• Altcoin: any cryptocurrency other than Bitcoin.
• Blockchain: a shared ledger that many computers keep in sync, where new records are added but old ones can't be changed.
• Cold storage: keeping private keys on a device that isn't connected to the internet.
• Exchange: a platform where you buy, sell and trade cryptocurrencies.
• Halving: the event, every 210,000 blocks, that cuts Bitcoin's block reward in half.
• Market cap: a coin's price multiplied by the number of coins in circulation.
• Mining: using computing power to add blocks to a proof-of-work blockchain, in exchange for new coins and fees.
• Network fee (gas): what you pay the network to process a transaction.
• Private key: the secret that authorizes spending. Never share it.
• Proof of stake: a way to secure a blockchain where validators lock up coins instead of spending electricity.
• Satoshi (sat): the smallest unit of bitcoin, 0.00000001 BTC.
• Seed phrase: 12 or 24 words that back up all the keys in a wallet.
• Stablecoin: a token designed to hold a steady price, usually $1.
• Wallet: an app or device that stores your keys and lets you send and receive crypto.

Frequently asked questions

Who created Bitcoin?

Someone using the name Satoshi Nakamoto, who published the white paper in 2008 and launched the network in 2009. Satoshi stepped away around 2011, and their identity has never been confirmed.

How many bitcoins are there?

Just over 20 million have been mined as of 2026, out of a maximum of 21 million. About 450 new bitcoin are created each day, and that rate halves again around 2028.

Can I buy less than one bitcoin?

Yes. Each bitcoin divides into 100 million satoshis, and most exchanges let you buy just a few dollars' worth.

Is Bitcoin anonymous?

Not really. It's pseudonymous: addresses aren't linked to names on the blockchain, but every transaction is public, and regulated exchanges know who their customers are. Analytics firms and law enforcement trace funds all the time.

Can Bitcoin be hacked?

The network's rules have held since 2009. Its one serious bug, found in August 2010, was fixed within hours. The thefts you read about happen at exchanges and in individual wallets, usually through phishing or stolen keys.

What happens when all 21 million bitcoin are mined?

Around 2140, the block reward reaches zero and miners are paid only through transaction fees. The supply simply stops growing.

What's the difference between Bitcoin and blockchain?

Blockchain is the technology, a kind of shared ledger. Bitcoin is the first and best-known network built on one. Many other cryptocurrencies run on blockchains of their own.

Is cryptocurrency a good investment?

That depends on your goals, your timeline and how much risk you can stomach, and it's not something anyone can answer for you. Crypto has produced big gains and big losses. If you do invest, stick to money you can afford to lose, favor well-established coins, and never borrow to buy.

Where to go from here

• Watch the market: live prices for more than 18,000 cryptocurrencies, plus the day's biggest movers.
• Stay current: the latest crypto news.
• Protect what you buy: how to secure your Bitcoin wallet.
• Spot the traps: the biggest Bitcoin scams and how they worked.
• Know your real numbers: the Coinfolytics portfolio tracker.

Sources

• Satoshi Nakamoto, Bitcoin: A Peer-to-Peer Electronic Cash System (2008).
• US Securities and Exchange Commission, Statement on the Approval of Spot Bitcoin Exchange-Traded Products (January 10, 2024).
• ethereum.org, The Merge.
• FBI Internet Crime Complaint Center, 2025 Internet Crime Report.
• Pew Research Center, About 1 in 5 Americans have used crypto (June 2026) and Majority of Americans aren't confident in the safety and reliability of cryptocurrency (October 2024).
• Internal Revenue Service, Digital assets.
• Decrypt, Lost Bitcoin: 3.7 million Bitcoin are probably gone forever, citing Chainalysis (2021).
• Prices, market values and coin counts: Coinfolytics market data, September 24, 2026.

This guide is for education only and isn't financial, investment or tax advice. Last updated: September 24, 2026.