Bitcoin (BTC): What It Is, Uses and Risks

Bitcoin is a decentralized digital currency that launched on 3 January 2009. It was created by a person or group using the pseudonym Satoshi Nakamoto. It runs on its own blockchain, a public ledger copied across thousands of computers, so no bank, company or government sits in the middle of a transfer. BTC is the unit of account on that network.

Strictly speaking, Bitcoin is a coin rather than a token. It is the native asset of its own chain and is not issued on top of another blockchain. Its main purpose is to let people send value to each other directly while solving the double-spending problem, which is making sure the same digital unit is not spent twice, without a trusted middleman.

The network is secured by Proof of Work mining using the SHA-256 hashing algorithm. Miners use specialized hardware to compete to add the next block of transactions, roughly every ten minutes. At the time of writing, Bitcoin ranks first by market capitalization among all crypto assets, and it is often grouped with Layer 1 networks, although its scripting is deliberately limited compared with smart contract platforms.

BTC is used in a few overlapping ways. The first is as a payment and transfer asset: anyone with a wallet can send it to anyone else, anywhere, at any hour, without asking permission. Some merchants accept it, though everyday spending is a small share of overall activity.

The second, and now the most common, is as a store of value or investment. Supporters often call it digital gold because of its fixed supply and resistance to censorship. Whether it actually behaves like gold is debated, and its price has swung far more than gold's.

Third, BTC is paid to miners as block rewards and transaction fees. This is what funds the security of the network, since miners spend real money on hardware and electricity to take part.

A newer layer of use has grown around the chain. Institutions gained access when US regulators approved 11 spot Bitcoin ETFs in January 2024. Companies such as Strategy hold BTC as a treasury reserve. Developers have also built Ordinals, which attach NFT-like data to individual satoshis, and BRC-20, an experimental token standard built on those inscriptions. Efforts grouped under the name BTCFi aim to bring lending and other financial tools to Bitcoin.

Bitcoin's supply is capped at 21 million coins, a rule written into the protocol and enforced by every node that validates the chain. As of 2026-11-05, about 20.1 million BTC had been mined, which leaves under a million still to be issued. Because there are no pre-allocated team or investor tranches, the circulating, total and fully diluted figures are effectively the same number.

New coins enter circulation only as miner rewards. Roughly every four years, or every 210,000 blocks, the reward is cut in half, an event called the halving. This is why issuance slows over time and why the last coins are not expected to be mined until the next century. Lost coins, such as those in wallets whose keys have been destroyed, are not counted out of the headline supply, so the effective available amount is likely lower than reported.

As of 2026-11-05, BTC traded at about $79,700, giving a market capitalization of roughly $1.6 trillion and 24-hour trading volume of about $34.7 billion. The price was little changed over the previous seven days and down around 21% over a year. Its all-time high was about $126,080 on 2025-10-06. Those figures move constantly and are shown for context only.

Bitcoin has its own base chain, and it is not a smart contract platform in the way Ethereum is. Transactions are bundled into blocks about every ten minutes, and users typically wait for several confirmations before treating a payment as final. Faster, cheaper payments are possible through the Lightning Network, a separate layer built on top of the base chain, though it has its own tradeoffs.

BTC is held in wallets, which are really managers for the private keys that authorize spending. Options include software wallets on a phone or computer, hardware wallets that keep keys offline, and custodial accounts where an exchange or broker holds the keys for you.

It is traded in several ways:

• On centralized exchanges, which usually require identity verification.
• Through spot ETFs and other regulated products, which give price exposure without owning the coins directly.
• Peer to peer, or through decentralized services.

Wrapped versions of BTC exist on other blockchains so it can be used in decentralized finance there. These rely on a bridge or custodian, which adds counterparty risk that native Bitcoin does not have. Make sure you know whether you hold real BTC or a wrapped representation.

The idea was set out in a 2008 white paper, and the first block, the genesis block, was mined on 3 January 2009. In its early years Bitcoin was used mainly by cryptographers and hobbyists, and its price was tiny. The all-time low recorded in the data is about $68, dated 2013-07-05, from the early exchange-era price history.

Since then, adoption has come in waves, with sharp booms and long drawdowns. Several halvings have cut the mining reward, and the most recent ones have been followed by large price swings, though correlation is not proof of cause.

A few events stand out:

• January 2023: Ordinals launched, letting people inscribe data such as images on individual satoshis, followed by the BRC-20 experiment.
• January 2024: US regulators approved 11 spot Bitcoin ETFs, opening the asset to traditional investors through brokerage accounts.
• Corporate treasuries: companies like Strategy, formerly MicroStrategy, adopted BTC as a reserve asset and financed purchases in various ways.
• 2025-10-06: BTC reached its record high of roughly $126,080. As of 2026-11-05 it was well below that peak, down about 21% over twelve months.

None of this guarantees any future direction, and the creator has never been publicly identified.

Price volatility is the most obvious risk. BTC can lose a large share of its value in weeks, and as of 2026-11-05 it sat roughly a third below its October 2025 peak. Anyone holding it should expect that kind of movement and only risk money they can afford to lose.

Other risks include:

• Custody risk: if you lose your keys or recovery phrase, nobody can restore access. If an exchange holding your coins fails or is hacked, you may not recover them.
• Scams: phishing sites, fake wallet apps, impersonators and "guaranteed return" schemes target Bitcoin holders constantly.
• Regulation and tax: rules differ by country and change, and BTC sales often create tax obligations.
• Concentration and derivative risk: leveraged products, and companies that borrow to buy BTC, can amplify sell-offs.
• Technical and long-term questions: security depends on mining economics once block rewards shrink, and future advances in computing may require protocol upgrades.
• Wrapped BTC on other chains adds bridge and smart contract risk.

Bitcoin is also not a payment system with chargebacks. Transfers are irreversible, so a mistaken address or a deceived sender usually means permanent loss.

The safest setup depends on how much you hold and how often you move it. For small amounts, a reputable software wallet on a device you keep updated may be enough. For larger holdings, many people use a hardware wallet bought directly from the manufacturer, which keeps private keys offline and signs transactions on the device itself.

Write your recovery phrase on paper or metal and store it somewhere private and protected from fire and water. Never photograph it, type it into a website, email it or share it with anyone claiming to be support staff. Consider keeping a backup in a second secure location.

Good habits include:

• Verify the receiving address on your hardware wallet screen before sending.
• Send a small test transaction first when moving a large amount.
• Use strong, unique passwords and two-factor authentication on any exchange account, preferably with an authenticator app rather than SMS.
• Keep only what you plan to trade on exchanges.
• Download software only from official sources and check for tampering.

If you hold BTC through an ETF or broker, you do not control the keys, so the safeguards that matter are those of the provider. This page is educational and not a recommendation to buy or sell.