What Is Bitcoin?

Bitcoin is a digital currency that exists only online and is run by a worldwide network of computers instead of a bank or a government.

It lets two people send value directly to each other over the internet, with no middleman approving the payment.

A person or group using the name Satoshi Nakamoto introduced it in a nine-page paper published on October 31, 2008, and the creator's real identity remains unknown.

Bitcoin was the first cryptocurrency, a type of digital money secured by cryptography, which is math that makes records extremely hard to forge, and it is still the largest by value.

Here is the easiest way to see what is different.

When you send $100 to a friend through your bank, the bank subtracts $100 from your balance in its own private record book, called a ledger, and adds $100 to your friend's.

The whole system depends on trusting that one company to keep the ledger honest.

Bitcoin replaces the private ledger with a public one, and thousands of computers keep identical copies, so no single company can quietly change it.

How Does Bitcoin Work?

Three pieces do most of the work.

The Blockchain

The blockchain is the shared ledger itself, a running list of every Bitcoin transaction ever made, grouped into batches called blocks and linked together in order.

Anyone can read it, and changing an old entry would mean redoing the work for every block built after it.

Mining

Mining is how new transactions get verified and added: computers compete to solve a math puzzle, and the winner adds the next block roughly every 10 minutes.

The winner, called a miner, earns newly created Bitcoin, currently 3.125 per block, and that reward is cut in half about every four years.

Wallets and Private Keys

A wallet is an app or device that stores your private key, a long secret code that proves you own your Bitcoin and lets you spend it.

If you lose the key, no company can reset it for you, and the Bitcoin is gone for good, which is the tradeoff of having no bank in the middle.

Why Do People Buy Bitcoin?

Most buyers are betting that Bitcoin's fixed supply will make it more valuable over time.

Under Bitcoin's current rules, only 21 million will ever exist, while governments can create more dollars whenever they choose.

Supporters call it digital gold, a store of value that cannot be printed away.

Critics point out that scarcity only matters if people keep wanting the thing, and that Bitcoin's price rests entirely on what the next buyer is willing to pay.

How Risky Is Bitcoin?

Price swings are the biggest risk for a new buyer, and a simple scenario shows why.

Imagine you put $1,000 into Bitcoin at the October 2025 peak of about $126,000.

When the price fell below $60,000 in June 2026, your $1,000 would have shrunk to roughly $470.

Even after the late-September rebound above $85,000, it would be worth only about $675.

Drops of that size are not unusual in Bitcoin's history, though history does not predict what comes next.

Bitcoin also pays nothing while you hold it, unlike a stock, which can pay dividends (a share of company profits), or a savings account, which pays interest.

That means any gain depends entirely on someone later paying more than you did.

There is no safety net either, because the FDIC insures bank deposits but not crypto assets, so a failed crypto company is not covered the way a failed bank is.

The practical defense is position size: many beginners treat Bitcoin as a small slice of their money, an amount they could watch fall by half without changing their plans.

Is Bitcoin Anonymous?

No, and this is one of the most common misunderstandings about it.

Every bitcoin transaction is permanently visible on the blockchain, tied to a wallet address, which is a string of letters and numbers, rather than to a name.

When you buy through a company that verifies your identity, that address can be linked back to you, and your transaction history can be traced.

How Is Bitcoin Taxed?

The IRS treats Bitcoin as property, not currency, so selling it or spending it can create a taxable gain or loss.

A capital gain is simply the profit on something you owned: if you buy $1,000 of Bitcoin and later sell it for $1,500, you owe tax on the $500 difference.

Holding for more than a year generally qualifies that profit for lower long-term rates, so check the current rules before you sell.

How Do You Buy Bitcoin?

You do not need to buy a whole coin, because Bitcoin divides down to eight decimal places.

At $85,000 per bitcoin, $25 buys about 0.0003 of one.

Spot Bitcoin ETFs

A spot Bitcoin ETF, short for exchange-traded fund, is a fund that holds real Bitcoin and trades like a stock, so you can buy shares through an ordinary brokerage account, which is an investing account at a firm that places stock trades for you.

The SEC approved the first U.S. versions in January 2024, and you own shares of the fund rather than the Bitcoin itself.

Crypto Exchanges

A crypto exchange is a website or app where you swap dollars for Bitcoin directly, and once you verify your identity you can open a Gemini account and buy bitcoin in dollars.

An exchange usually holds your private key for you, which is convenient, but it means you are trusting the company with your Bitcoin.

A Personal Wallet

If you want sole control, you can move your Bitcoin to a personal wallet where only you hold the private key.

From that point, no company can freeze your Bitcoin, and no company can help if you lose the key.