https://why21million.com/book/ Bitcoin, explained with arithmetic instead of opinions. New chapters of a free, plain-arithmetic book, published as they're written. No signup required to read. en-us Thu, 27 Aug 2026 14:00:00 GMT https://why21million.com/book/bitcoin-hedge-or-risk-asset/ https://why21million.com/book/bitcoin-hedge-or-risk-asset/ Thu, 27 Aug 2026 14:00:00 GMT Bitcoin was pitched as an asset outside the financial system. Increasingly its price moves with the stock market instead of against it. Spot ETFs, the GENIUS Act's stablecoin rules, and what the honest answer to "is it a hedge" actually is. The final chapter of the book, for now. https://why21million.com/book/price-fluctuation/ https://why21million.com/book/price-fluctuation/ Wed, 12 Aug 2026 14:00:00 GMT Not a price prediction — a mechanism. Why a fixed, inelastic supply meeting sentiment-driven demand produces swings that a company's stock or a government's currency rarely sees. https://why21million.com/book/is-bitcoin-part-of-defi/ https://why21million.com/book/is-bitcoin-part-of-defi/ Tue, 11 Aug 2026 14:00:00 GMT Bitcoin's own scripting language deliberately can't run DeFi's smart contracts. Wrapped Bitcoin is the workaround that puts BTC's value into DeFi anyway — custodian, peg, and bridge risk included. https://why21million.com/book/can-you-stake-bitcoin/ https://why21million.com/book/can-you-stake-bitcoin/ Tue, 11 Aug 2026 14:00:00 GMT Bitcoin runs on proof-of-work, not proof-of-stake — so there's no native staking on its own ledger. But "Bitcoin staking" is advertised everywhere. Three genuinely different things hide behind that one word, and the differences matter. https://why21million.com/book/privacy/ https://why21million.com/book/privacy/ Tue, 11 Aug 2026 09:00:00 GMT Bitcoin gets called both "perfectly anonymous" and "not private at all," often in the same conversation. Neither is right. What the public ledger actually reveals, what one KYC link exposes retroactively, and what genuinely helps. https://why21million.com/book/exchange-vs-swap/ https://why21million.com/book/exchange-vs-swap/ Mon, 10 Aug 2026 15:00:00 GMT A full exchange account — order books, held balances, identity verification — versus an instant swap with no account at all. What actually differs, and what you trade away for the convenience. https://why21million.com/book/is-bitcoin-a-scam/ https://why21million.com/book/is-bitcoin-a-scam/ Mon, 10 Aug 2026 09:00:00 GMT Is it a pyramid scheme? Why does it have any value at all? And why do scammers seem to like it so much? Three of the most common objections, taken seriously and answered with arithmetic, not defensiveness. https://why21million.com/book/proof-of-work-vs-proof-of-stake/ https://why21million.com/book/proof-of-work-vs-proof-of-stake/ Sun, 09 Aug 2026 09:00:00 GMT Bitcoin's security doesn't come from a committee — it comes from "proof." How proof-of-work, proof-of-stake, and their lesser-known cousins actually secure a ledger, argued on tradeoffs, not tribal loyalty. https://why21million.com/book/altcoins/ https://why21million.com/book/altcoins/ Sat, 08 Aug 2026 09:00:00 GMT Bitcoin, then thousands of everything-else. What actually makes a coin an altcoin, how wildly their supply and rules can vary, and why this book still only does the arithmetic for one of them. https://why21million.com/book/getting-paid/ https://why21million.com/book/getting-paid/ Fri, 07 Aug 2026 09:00:00 GMT The only method on this list with no counterparty and no signup — just the arithmetic of what someone actually pays you. https://why21million.com/book/mining-it-yourself/ https://why21million.com/book/mining-it-yourself/ Thu, 06 Aug 2026 09:00:00 GMT Not the economics — that's covered elsewhere. What actually happens if you point hardware at the network yourself: the real odds, the electricity bill, and why "cloud mining" has a documented history of fraud. https://why21million.com/book/broker-vs-p2p/ https://why21million.com/book/broker-vs-p2p/ Wed, 05 Aug 2026 09:00:00 GMT A broker sells you bitcoin directly at a markup, no order book required. Peer-to-peer means finding another person and trusting nobody in between. Two ways to skip the exchange model, with very different risk profiles. https://why21million.com/book/wallets/ https://why21million.com/book/wallets/ Tue, 04 Aug 2026 09:00:00 GMT A wallet doesn't hold coins — it holds keys. Hot vs. cold, custodial vs. non-custodial, and where a hardware wallet actually fits in that picture. https://why21million.com/book/coins-gone-forever/ https://why21million.com/book/coins-gone-forever/ Mon, 03 Aug 2026 09:00:00 GMT Millions of bitcoin are provably unspendable. What that does to the real, spendable supply. https://why21million.com/book/lightning/ https://why21million.com/book/lightning/ Sun, 02 Aug 2026 09:00:00 GMT Why a tip jar needs a second layer, and how it keeps Bitcoin's ledger from having to record every cup of coffee. https://why21million.com/book/utxos/ https://why21million.com/book/utxos/ Sat, 01 Aug 2026 09:00:00 GMT Bitcoin doesn't have account balances. It has something closer to bills in a wallet — and that changes how transactions actually work. https://why21million.com/book/keys-custody/ https://why21million.com/book/keys-custody/ Fri, 31 Jul 2026 09:00:00 GMT The one rule that outranks every other rule in Bitcoin, and why it can't be delegated to a website — including this one. https://why21million.com/book/scarcity-you-can-audit/ https://why21million.com/book/scarcity-you-can-audit/ Thu, 30 Jul 2026 09:00:00 GMT Anyone with a laptop can count every coin ever issued and check it against the schedule. What that actually buys you. https://why21million.com/book/why-miners-bother/ https://why21million.com/book/why-miners-bother/ Wed, 29 Jul 2026 09:00:00 GMT The reward keeps shrinking. Why does anyone still spend real electricity chasing it? The two-paycheck arithmetic behind mining. https://why21million.com/book/halving-schedule/ https://why21million.com/book/halving-schedule/ Tue, 28 Jul 2026 09:00:00 GMT Every halving in history, and every halving still to come, laid out on one table. https://why21million.com/book/blocks-bitcoins-clock/ https://why21million.com/book/blocks-bitcoins-clock/ Mon, 27 Jul 2026 09:00:00 GMT Bitcoin doesn't track time — it tracks blocks. How a ten-minute average becomes the clock the entire schedule runs on. https://why21million.com/book/one-hundred-million-satoshis/ https://why21million.com/book/one-hundred-million-satoshis/ Sun, 26 Jul 2026 09:00:00 GMT Why the satoshi, not the bitcoin, is the unit that actually matters once you do the arithmetic on global population. https://why21million.com/book/inflation-deflation/ https://why21million.com/book/inflation-deflation/ Sat, 25 Jul 2026 18:00:00 GMT What actually changes when a currency's supply is fixed instead of managed — the honest case for both sides, argued fairly. https://why21million.com/book/why-21-million/ https://why21million.com/book/why-21-million/ Sat, 25 Jul 2026 09:00:00 GMT The 21 million cap was never voted on or decreed — it's the sum of a geometric series anyone can check with paper and a pencil.