Bitcoin FAQ — 36 questions, answered straight

Bitcoin is decentralized digital money — a currency that runs on a global network of computers instead of a bank. Created in 2009, it lets anyone send value to anyone else, anywhere, without permission from any institution. Its supply is hard-capped at 21 million coins, which is why many treat it as digital gold. I've used it as actual money for over a decade: paying rent, crossing borders, living on it. For the full picture, start with our Bitcoin overview.

A person or group using the pseudonym Satoshi Nakamoto published the Bitcoin whitepaper in October 2008 and mined the first block in January 2009. Satoshi handed the project to other developers and vanished in 2011 — their identity has never been credibly established, and their estimated one million BTC have never moved. That absence is a feature, not a mystery to solve: Bitcoin has no founder to arrest, pressure, or corrupt, which is exactly what makes it neutral money.

When you send Bitcoin, your wallet signs the transaction with your private key and broadcasts it to the network. Miners collect pending transactions into blocks and compete to add them to the blockchain by expending computing power — a process called proof-of-work. Thousands of independent nodes then verify every rule was followed. A new block is added roughly every ten minutes. No central server exists, which means there is nothing to switch off and nobody who can reverse a valid transaction.

A blockchain is a public ledger of transactions grouped into blocks, each cryptographically linked to the one before it — hence the chain. Because thousands of computers hold identical copies and verify every new entry, no single party can rewrite history: altering an old block would require redoing all the work that came after it across the majority of the network. That immutability is the point. It replaces trust in an institution with verification by mathematics.

The protocol caps supply at 21 million BTC — a limit enforced by every node on the network and effectively impossible to change. Around 19.9 million have been mined already; the rest trickle out on a fixed schedule that halves every four years, with the final fraction arriving around 2140. Realistically, the available supply is smaller: several million coins are considered lost forever in forgotten wallets. That verifiable, shrinking scarcity is the core of the investment case.

A satoshi — or sat — is the smallest unit of Bitcoin: one hundred millionth of a coin, named after Bitcoin's creator. Just as a dollar divides into cents, 1 BTC divides into 100,000,000 sats. Thinking in sats makes Bitcoin practical at today's prices — nobody needs a whole coin, and saying 25,000 sats beats saying 0.00025 BTC. Get a feel for the numbers with our satoshi to USD converter, which converts sats, BTC, and dollars at the live price.

The straightforward path: sign up with a major regulated exchange like Binance, verify your identity, deposit money, and buy. The purchase takes minutes. The part beginners skip — and shouldn't — is what comes after: withdrawing your coins to a wallet you control. Our complete beginner's guide to buying your first Bitcoin walks through every step, including the mistakes I made so you don't have to.

You don't need a whole coin — Bitcoin is divisible to eight decimal places, and most exchanges let you start with about $10. Buying $50 of Bitcoin makes you a Bitcoin owner exactly as much as buying two whole coins does; you simply own fewer sats. This trips up more beginners than any technical concept: the unit price doesn't matter, your stake does. Start with an amount that lets you learn the mechanics — buying, withdrawing, securing — without stress.

Statistically, lump-sum investing has beaten spreading purchases out more often than not, because Bitcoin has spent most of its history going up. Psychologically, buying gradually wins for most people — no agonizing over timing, no panic if the price halves the week after you buy. Compare both approaches with real history: our lump-sum calculator shows what a one-time buy did, and the DCA calculator shows the same money drip-fed monthly. The honest answer: the strategy you'll stick with is the better one.

Dollar cost averaging means buying a fixed amount on a fixed schedule — say $50 every month — regardless of price. When Bitcoin is cheap your money buys more; when it's expensive, less. Over time your cost per coin averages out, and you never have to answer the impossible question of when to buy. It's how most long-term holders actually accumulate. Read our long-term investor's guide to DCA, then simulate your own plan with the DCA calculator.

Nobody knows, and anyone claiming otherwise is selling something. Bitcoin has crashed 70–80% several times and then made new highs; the people who did best weren't the ones who timed bottoms, they were the ones who stayed in the market for years. Bear markets have historically been the best accumulation windows — and the hardest ones to buy in, because everything feels broken. The practical rule: buy with money you won't need for years, on a schedule that removes emotion.

People asked this at $100, at $1,000, at $10,000, and at $100,000. The huge early multiples are gone — nobody is turning $100 into millions anymore — but the question that matters is whether Bitcoin's role in the world keeps growing from here. Run the numbers yourself: our If You Had Invested calculator shows what past entry points returned, and the Bitcoin vs S&P 500 vs Gold comparator shows how it stacked up against traditional assets. Volatility cuts both ways; size your position accordingly.

A wallet doesn't store coins — those live on the blockchain. It stores your private keys: the cryptographic secrets that prove ownership and authorize spending. Whoever holds the keys owns the Bitcoin, full stop. Wallets come as apps on your phone (convenient, riskier), hardware devices (offline, far safer), or even words written on paper. The distinction matters more than any other in crypto: coins on an exchange are an IOU; coins in your wallet are property.

A hot wallet is connected to the internet — an exchange account or a phone app. It's convenient for spending and trading but exposed to hackers, malware, and phishing. A cold wallet keeps your keys on a device that never touches the internet, typically a hardware wallet, making remote theft practically impossible. The sensible setup mirrors how you treat cash: a small amount in the hot wallet for day-to-day use, the savings in cold storage.

All three are solid; they optimize for different things. Ledger is the polished all-rounder with the widest coin support. Trezor is fully open-source with the longest track record. Coldcard is the Bitcoin-only maximalist choice — air-gapped, paranoid by design, and the least beginner-friendly of the three. For most people starting out, a Ledger hits the right balance of security and usability. Our full hardware wallet comparison breaks down the trade-offs in detail.

The process is simpler than its reputation: unbox the device (buy directly from the manufacturer, never second-hand), initialize it, write the generated seed phrase on paper, confirm it on-device, set a PIN, and install the companion app. Then send a small test amount before moving anything meaningful. The whole thing takes twenty minutes, and the only genuinely dangerous step is handling the seed phrase carelessly. Follow our step-by-step Ledger setup guide for the full walkthrough.

A seed phrase is 12 or 24 ordinary words that encode the master key to your entire wallet. Anyone who has those words has your Bitcoin — no password, device, or permission needed. That makes it both your ultimate backup and your biggest vulnerability. Write it on paper or steel, store it offline, and never photograph it, type it into a website, or share it with anyone claiming to be support. Our guide to critical seed phrase mistakes covers the traps that have cost people fortunes.

It depends on what else you still have. If your hardware wallet works and you know the PIN, nothing is lost yet — move your funds to a freshly generated wallet and back up the new phrase properly. If the device is gone or broken and the phrase is too, your Bitcoin is unrecoverable. Not by the manufacturer, not by a recovery service, not by anyone — that's the flip side of nobody being able to confiscate it. Treat the backup as seriously as the coins themselves.

Not for the long term. Coins on an exchange are a claim on a company, not Bitcoin you control — and the history is brutal: Mt. Gox, QuadrigaCX, Celsius, FTX all took customer funds down with them. The saying "not your keys, not your coins" is the most expensive lesson in crypto, and people keep relearning it. Keeping a small balance on an exchange for active trading is a reasonable trade-off. Savings belong in cold storage that you control.

Separate the protocol from everything around it. The Bitcoin network itself has run since 2009 without being hacked — its security budget is measured in billions of dollars of hardware and electricity. The dangers live at the edges: exchanges get breached, people lose keys, scammers manipulate users. In practice, your security is determined by your own habits — self-custody on a hardware wallet, a properly stored seed phrase, and healthy skepticism cover the overwhelming majority of real-world risk.

The patterns barely change: guaranteed returns (nothing legitimate guarantees returns), pressure to act now, strangers messaging you first, "send crypto and receive double back," fake celebrity endorsements, and platforms that happily take deposits but invent fees when you withdraw. If someone you've never met is helping you get rich, you are the product. After a decade in this space I've seen every variant — our complete scam protection guide catalogs them and the tells that give each one away.

Phishing is impersonation: a fake exchange login page, an email that looks like Ledger or Binance, a "support agent" in your DMs, or a counterfeit wallet app — all engineered to make you enter your password or seed phrase. One rule defeats nearly all of it: no legitimate company will ever ask for your seed phrase, and no real support agent contacts you first. Bookmark the sites you use, type addresses manually, and treat every unsolicited crypto message as hostile until proven otherwise.

The network? Practically, no. Rewriting the blockchain would require controlling the majority of global mining power — an attack costing billions, detectable immediately, and self-defeating since it would destroy the value of what it captured. Sixteen years of the world's most attacked computer network says the incentives hold. What gets "hacked" in headlines is the infrastructure around Bitcoin: exchanges, apps, and people. The protocol has never been the weak point — the humans and businesses holding keys are.

Two-factor authentication adds a second lock to your accounts: something you have (a code from your phone) on top of something you know (your password). When an exchange leak spills your password, 2FA is what stands between a criminal and your funds. Use an authenticator app like Google Authenticator or Aegis — not SMS, because attackers hijack phone numbers through SIM-swap attacks specifically to drain crypto accounts. Enable it on every exchange and email account you own, today.

In most of the world, yes — owning, buying, and selling Bitcoin is legal across North America, Europe, and most of Asia and Latin America, with El Salvador even adopting it as legal tender. A handful of countries, notably China, ban trading outright, and others restrict banking access to exchanges. What varies far more than legality is tax treatment and reporting rules. Check your own jurisdiction's rules before assuming anything — and be suspicious of platforms operating from nowhere in particular.

Almost certainly, once you dispose of it. Most countries treat Bitcoin as property: selling for fiat, trading it for another crypto, or spending it are taxable events, usually under capital gains rules. Rates and exemptions vary enormously — Germany taxes nothing after a one-year hold, while other countries tax every transaction. Keep records of every buy, sell, and trade from day one; reconstructing years of history later is miserable. Our country-by-country Bitcoin tax guide covers the major jurisdictions.

In most countries, simply holding Bitcoin triggers no tax — unrealized gains aren't taxed until you dispose of the asset. But "disposing" is broader than people assume: swapping Bitcoin for another cryptocurrency, spending it on goods, or earning it as income are all typically taxable, even though no dollars ever touched your bank account. A few countries also levy wealth taxes that include crypto holdings. The safe assumption: holding is fine, everything else is an event worth recording.

Mostly because you told them — indirectly. Every regulated exchange runs KYC identity checks and, in a growing list of countries, reports customer holdings and transactions to tax authorities automatically. Add chain-analysis firms that link blockchain activity to identified exchange accounts, plus bank transfers to and from crypto platforms, and the picture is fairly complete. The era of crypto as an invisible asset ended years ago. Assume the authorities know, report honestly, and keep records that back you up.

Only what you can watch drop 70% without selling or losing sleep — because historically, that drawdown has happened repeatedly, and the people who lost money were mostly those forced or panicked into selling the bottom. Common allocations run anywhere from 1% to 10% of a portfolio depending on conviction and time horizon; there is no magic number. What matters is that the position is sized for the volatility that Bitcoin actually has, not the volatility you hope it will have.

They're different tools. Bitcoin is engineered to be money: a fixed 21-million supply, maximum decentralization, and a protocol that changes as rarely as possible — boring by design, which is what you want from a store of value. Ethereum is a programmable platform: it hosts smart contracts, DeFi, NFTs, and thousands of tokens, evolving fast and carrying correspondingly more complexity and risk. Owning one is not a substitute for the other. Our Bitcoin vs Ethereum guide explains the trade-offs for beginners.

It depends entirely on the window you pick. Over most multi-year periods since 2013, Bitcoin has crushed both — but with drawdowns that would make a stock investor faint, and there are stretches where the S&P 500 or gold quietly won. Rather than take anyone's word for it, run the actual numbers: our Bitcoin vs S&P 500 vs Gold comparator tracks the same investment through all three assets from any start date since 2013, with the full ride charted honestly — crashes included.

Every 210,000 blocks — roughly four years — the reward miners earn for each new block is cut in half. It's the mechanism that enforces Bitcoin's fixed supply schedule: from 50 BTC per block in 2009 down to 3.125 BTC since April 2024, halving again around 2028 until the last coin arrives near 2140. Each halving cuts the flow of new supply in half overnight, and the previous ones have preceded major bull markets — though with only a few data points, treat that pattern as history, not prophecy.

Mathematically, it's a question of three numbers: what your retirement costs, how much BTC you hold, and what Bitcoin is worth when you need it — and that last one is the assumption doing all the heavy lifting. Our Bitcoin retirement calculator lets you set your monthly spending and test conservative, moderate, and bullish price scenarios to see exactly how much BTC each would require. Treat every result as a what-if, not a plan — and never stake a retirement on a single volatile asset.

Position sizing is deciding how much money rides on a single trade — and it's the discipline that separates traders who survive from those who blow up. The standard rule: risk only 1–2% of your account per trade, calculated from the distance to your stop loss, so that even a string of losses leaves you standing. Most beginners invert this, betting big on high conviction and getting erased by one bad streak. Our position sizing guide shows the exact math.

Supply and demand, expressed through a few recurring forces: macro liquidity (when money is cheap, risk assets rise), the four-year halving cycle tightening new supply, institutional and ETF flows, regulation news in major markets, and raw sentiment — fear and greed amplified by leverage. Short-term moves are mostly noise and liquidations; the long-term trend has followed adoption. Nobody reliably predicts the next month. If you must watch something, watch liquidity and adoption, not headlines.

Our news section covers the Bitcoin and crypto stories that actually matter daily — market moves, regulation, security incidents — written for signal, not clicks, and available by RSS. If you're starting from zero, news alone won't build the foundation: our free 7-day Bitcoin course delivers the essentials one lesson at a time, from buying your first sats to storing them safely — everything I wish someone had handed me in 2013. Sign up below; it's free forever.