What is Bitcoin? — The Daily Coins

Bitcoin is a digital currency that runs on a network of computers without a central authority. There is no Bitcoin company. No CEO. No board. The rules are encoded in software and enforced by the people who run it — and they cannot be changed unilaterally by any single party, including the original author. That property is what most people mean when they say Bitcoin is “decentralised”.

This guide is the long, plain-English version of what Bitcoin is, how it works, who actually uses it, and where the risks live. If you are new, read it top to bottom. If you already own some, jump to the sections on custody, halvings, and real risks.

A 90-second mental model

Imagine a global, public spreadsheet. Anyone can read it. Anyone can add a row to it, but only by following strict rules. The rules say a row is valid only if (a) the person sending money actually has it, (b) they sign the transaction with a private key only they know, and (c) the row is approved by the rest of the network. The spreadsheet is identical on every computer that runs the software, and it updates roughly every ten minutes. No company hosts it. There is no support email. If the file lives anywhere, it lives everywhere.

That is the mental model. Bitcoin is a shared ledger. Money is just numbers in the spreadsheet, and the only way to move numbers around is by signing a transaction that the network will accept. Lose the key and the numbers are still there — you just cannot move them. Send to the wrong address and the numbers move and there is no reversal. The system is deliberately rigid.

A second analogy that helps: Bitcoin is like email for value. Before the internet, you needed Western Union or a bank or a courier to move money across borders. Email replaced couriers for written messages, and Bitcoin tries to do the same for payments. Just like email, it is permissionless — you do not ask anyone to create an account for you. You generate a key pair, and you have an address.

How it works

Underneath the analogies, the machinery is concrete. When you send Bitcoin, your wallet software constructs a transaction that says “take this much from address A, send it to address B, and here is my cryptographic signature proving I control A.” The transaction is broadcast to the network of computers (called nodes) that run the Bitcoin software.

Specialised nodes called miners collect pending transactions into a candidate block. They then race to solve a mathematical puzzle that requires brute-force computation — guessing trillions of numbers per second until one of them produces a hash with enough leading zeros. The first miner to solve it broadcasts the new block to the rest of the network, which checks the work and appends it to the chain (the blockchain). The winning miner is rewarded with newly issued Bitcoin (the “block subsidy”) plus the fees attached to the transactions in the block.

This race repeats roughly every ten minutes. The difficulty of the puzzle adjusts every 2,016 blocks (about two weeks) so that even as more mining hardware comes online, blocks still arrive at roughly that ten-minute pace. This is called the difficulty adjustment. It is one of Bitcoin’s most elegant design features: a self-regulating clock built out of pure economic incentive.

A few words on signatures, since they are the cryptographic heart of the system. Every Bitcoin address is derived from a public key. The private key is a 256-bit secret number that only the owner knows. To spend Bitcoin from an address, you produce a digital signature using that private key. The network can verify the signature with the public key, but cannot derive the private key from the signature. That is what makes the whole thing work: you can prove you own coins without ever revealing the secret that lets you spend them.

Why people hold it

There is no single reason to hold Bitcoin. Different people hold it for different, sometimes contradictory reasons. Here are the four most common, with the honest tradeoffs of each.

1. As a store of value. The argument: there will only ever be 21 million Bitcoin. No central bank can print more. Over long horizons, holders bet that fixed supply plus growing demand pushes the price up faster than fiat currencies erode. The tradeoff: short-term volatility is brutal. Bitcoin has lost more than 70% of its value four separate times in its history. “Store of value” only works if you can stomach the drawdowns long enough for the thesis to play out.

2. As a hedge against monetary debasement. Holders point at central bank balance sheets that have tripled since 2008 and argue that an asset with truly fixed supply has an unusual role to play. The tradeoff: the correlation between Bitcoin and stocks has been positive in most macro stress events of the last five years. It is not yet the uncorrelated hedge gold sometimes is. The thesis may still play out — it just has not played out in the way the loudest holders predicted.

3. As a payment rail. Bitcoin moves money across borders without a bank in the middle. For remittances out of countries with capital controls, or for shipping value to places traditional finance cannot reach, this is genuine utility. The tradeoff: base-layer Bitcoin is slow (ten-minute blocks) and not free (fees rise with congestion). The Lightning Network solves much of this for small payments but is still a relatively small piece of overall Bitcoin activity.

4. As a speculation. Plenty of people hold Bitcoin because they believe the price will be higher next year than it is today and they want to be along for the ride. There is nothing wrong with this — most early holders started this way. The tradeoff: when you treat Bitcoin as a trade, you have to behave like a trader. That means sizing, stops, and a clear plan for what you do at a 50% drawdown. Most casual holders never think this through and end up selling at exactly the wrong moment.

Halvings and the issuance schedule

Bitcoin’s supply is governed by a single hard-coded rule: roughly every four years (precisely, every 210,000 blocks), the block reward paid to miners cuts in half. This is the halving. New supply gets steadily harder to produce until, around the year 2140, the last fraction of a Bitcoin is mined and the total supply asymptotes to 21 million.

The halving history is short enough to list:

Genesis (January 2009). Block reward starts at 50 BTC per block.
First halving (November 2012). Reward drops to 25 BTC.
Second halving (July 2016). Reward drops to 12.5 BTC.
Third halving (May 2020). Reward drops to 6.25 BTC.
Fourth halving (April 2024). Reward drops to 3.125 BTC.
Fifth halving (expected 2028). Reward drops to ~1.5625 BTC.

Halvings matter because they cut the rate of new supply hitting the market in half overnight. If demand stays constant and supply is halved, basic economics says the price should rise. Historically each halving has been followed within 12 to 18 months by a major bull market, though correlation is not causation and the sample size is just four. The model is also crowded — everyone now knows when halvings happen, so any “edge” from the schedule alone is probably gone.

What halvings really do is squeeze miner economics. Miners’ revenue is cut in half on the same day their costs (electricity, hardware depreciation) stay constant. Less efficient miners get pushed out, hashrate temporarily wobbles, and the difficulty adjusts down to compensate. The cycle is more about restructuring the producer side than directly moving the price.

Bitcoin versus other crypto

It is tempting to treat all crypto as one asset class, but the categories really do behave differently. The cleanest framing is this: Bitcoin is monetary; everything else is something else.

Bitcoin’s pitch is single-minded — be the hardest, most credibly neutral form of digital money ever created. The protocol is deliberately conservative. Upgrades are rare and contentious. There is no roadmap of features, no foundation that controls direction, no plan to make it more programmable. That conservatism is the point.

Ethereum, by contrast, is a platform. It optimises for programmability, smart contracts, and the ability for developers to build on top of it. That brings flexibility and an explosion of use cases, at the cost of more complexity and more places for things to break. (We cover Ethereum in detail in our Ethereum guide.)

The rest of the major-cap landscape — Solana, Avalanche, Cardano, Polkadot, BNB Chain, and the long tail of layer-1 blockchains — are mostly competing on the same axis as Ethereum, trading off decentralisation against speed, cost, and developer experience. They are not really competing with Bitcoin. A Bitcoin-versus-Solana debate is a category error: they are doing different jobs.

What Bitcoin is not

The hype cycle around Bitcoin produces an endless supply of bad analogies, so it is worth being precise about what Bitcoin is not. It is not anonymous — every transaction is traceable on a public ledger. Chain analysis firms can often tie addresses back to real-world identities, especially when those addresses interact with exchanges that perform KYC. The pseudonymity is real, but it is not anonymity.

Bitcoin is also not free to use. Transaction fees rise with network congestion. During peak demand in 2024, a single base-layer transaction cost over $100 in fees for a few hours. Most of the time it is cheap, but the “free instant payments” framing is not accurate.

It is not particularly fast. A confirmed transaction takes roughly an hour for high-value transfers (six confirmations is the conservative standard). The Lightning Network solves much of this for small payments, but Lightning has its own design choices and limitations. If you need a hundred-millisecond settlement, Bitcoin is not the right tool.

And it is not a stable store of value in the short term. The asset that dropped 50% twice in 2022 alone is not where you keep next month’s rent. The store-of-value case is multi-year. Forgetting that has cost a lot of people money.

Custody: self versus exchange

Owning Bitcoin sounds simple but actually means deciding how to control the private key that proves ownership. There are three main options, and the choice has real consequences.

Exchange custody. When you buy on Coinbase, Kraken, or Binance and leave the coins there, the exchange holds the keys on your behalf. You see a balance in your account; the exchange is technically holding the Bitcoin. This is convenient — they handle backups, two-factor authentication, recovery — but you are exposed to the exchange’s solvency. FTX in 2022 reminded everyone what happens when an exchange uses customer funds for its own purposes. The phrase “not your keys, not your coins” comes from this.

Hot wallet self-custody. A wallet app on your phone or laptop that holds the keys locally. You sign transactions yourself; the exchange has nothing to do with it. Faster than hardware wallets, but the keys live on a device that is also running a browser, email, and any number of apps that might be compromised. Best for small amounts of operating capital.

Cold storage / hardware wallets. Devices like Ledger or Trezor that hold the private key offline. To sign a transaction, you plug them in, confirm on the device’s small screen, and unplug. The key never touches an internet-connected computer. This is the gold standard for amounts you do not need to touch weekly. The risk shifts from online attackers to losing the device or seed phrase. If you go this route, write the seed phrase on metal (not paper), store it in two physically distant places, and never type it into a website ever, for any reason.

There is no single right answer. Most active holders use a mix — small operating balance on an exchange or hot wallet, the rest in cold storage. The boring advice is the correct advice: do not leave more on an exchange than you would be sad to lose.

Real risks

Bitcoin has been called everything from a fraud to the future of money. The truth is in the middle, and the risks are real. We try to be honest about all of them.

Volatility. Bitcoin can move 5 to 10% in a single day with no news. It has lost more than 70% of its value four times. If you cannot live with a position halving while you sleep, you are sized too big.

Regulatory risk. Different jurisdictions treat Bitcoin differently, and the rules change. Spot ETFs were approved in the US in early 2024, which legitimised one form of exposure; staking products and DeFi remain in regulatory grey zones in many places. A sufficiently aggressive policy change in a major economy could meaningfully affect price.

Exchange counterparty risk. As FTX, Mt. Gox, QuadrigaCX, and others demonstrated, exchanges can fail. Even regulated ones can suffer outages, hacks, or freezes. Treating exchange balances as fully equivalent to Bitcoin on your own keys is a category mistake that has cost people billions of dollars in aggregate.

Lost keys. An estimated 3 to 4 million Bitcoin are believed to be permanently lost — keys forgotten, hard drives thrown away, seed phrases destroyed in fires. Once gone, it is gone. Bitcoin has no recovery mechanism by design.

Supply concentration. A small number of wallets hold a disproportionately large share of the supply. Many of these are exchanges (custodial for users), not single actors, but the concentration is real and worth watching. Whale-driven moves can rattle short-term price action even when long-term fundamentals are unchanged.

51% attacks and protocol risk. In theory, an entity that controlled more than half the hashrate could double-spend recent transactions. In practice, this has never happened to Bitcoin — the cost would be enormous and would destroy the attacker’s investment. But it is the kind of tail risk worth knowing exists.

Quantum computing. A long-tail concern. Sufficient quantum computing capability could in theory break the elliptic curve cryptography Bitcoin uses for signatures. The community has been planning for a post-quantum migration for years; the timeline is not imminent but it is not infinite either.

Who actually uses Bitcoin

Five distinct user groups, each with different needs from the network.

Long-term holders (“hodlers”). The largest group by coin count. Buy and forget. Care mainly about supply, security, and that the protocol does not change in ways that undermine the long-term scarcity story. The deepest conservative bias in the community comes from this group.

Institutional allocators. Pension funds, family offices, and corporate treasuries with multi-million-dollar BTC allocations, often via spot ETFs since 2024. Care about regulatory clarity, custody options, and accounting treatment more than about underlying tech debates.

Active traders. Use Bitcoin’s liquidity and 24/7 markets to express short-term views. Heavy users of perp futures, options, and the BTC/USD spot pair. Care about exchange uptime, derivatives liquidity, and predictable funding rates.

Cross-border users. Remittances out of high-fee corridors, capital flight from countries with controls, and small-business settlement in places where the local banking system is hostile or expensive. Often the most underrated use case in coverage.

Builders. Developers working on Lightning, on inscriptions and ordinals, on sidechains like Liquid, and on adjacent infrastructure. Smaller community than Ethereum’s, but real and active. The Bitcoin development culture is intentionally slow and conservative; new features arrive at glacial pace by web-software standards.

How we cover Bitcoin on this site

The Daily Coins covers Bitcoin every day. You can find the live price page, our quantitative forecast, our news coverage, and the methodology behind our models at the following places.

/coins/bitcoin/ — live BTC price, market cap, 24-hour change, and our predictions across every horizon from 24 hours to multi-year.
/predictions/bitcoin/ — the dedicated Bitcoin forecast page, updated continuously.
/category/bitcoin/ — every news article we have published on Bitcoin, in reverse chronological order.
/methodology/ — exactly how the model is constructed, what data goes in, and what we measure.

If you want a single page to bookmark, the coin profile at /coins/bitcoin/ is the one. It updates constantly and links out to everything else.