A short history of the only money with a schedule you can read in advance — and four little machines you can drive to feel why it behaves the way it does.
On 3 January 2009 a program started issuing a currency on a fixed timetable that no one can change. Everything strange about Bitcoin — the four-year rhythm, the ten-minute heartbeat, the violent booms and busts — falls out of a handful of rules. The prose below explains them; the figures let you drive them. Drag anything underlined or any mark on a chart.
Bitcoin's supply isn't decided by a central bank; it's decided by arithmetic. New coins are paid to miners as a block reward, and that reward halves every 210,000 blocks — roughly every four years. It began at 50 coins per block in 2009 and has stepped down ever since: 25 in 2012, 12.5 in 2016, 6.25 in 2020, 3.125 in 2024. Summed to infinity it converges on 21 million coins, and not one more.
The consequence is front-loaded scarcity. By 2024, roughly — of every bitcoin that will ever exist had already been mined.
Notice the shape: about half of all bitcoin was minted in the first four years, three-quarters by 2016. The curve flattens hard — the last coins won't be mined until around 2140. Scarcity here isn't a marketing claim; it's a flat line you can see coming.
If anyone can mine, what stops a flood of blocks as more computers join? A feedback loop. The network targets one block every ten minutes; every 2,016 blocks (~two weeks) it measures how fast blocks actually arrived and re-sets the difficulty to pull the average back to ten. Add hashpower and blocks briefly come faster — then difficulty rises and claws the rhythm back.
The point that trips people up: more miners do not make more coins. The reward schedule is fixed (§1). Extra hashpower buys only one thing — a more expensive chain to attack. Energy in, security out; issuance unchanged.
Because the new supply is cut in half on a clock, Bitcoin's history has a beat. Each halving (the dotted lines) has been loosely followed by a mania and then a brutal hangover — drawdowns of 80% or more are normal, not exceptional.
Read it on a log scale or the early years vanish: a move from $1 to $10 matters as much as $10,000 to $100,000. The cycles are real but the timing is not a law — treat the pattern as rhythm, not prophecy.
The honest hook, made driveable. Put $1,000 into bitcoin at the end of 2016 (about — per coin), hold until a price of $100,000 — and you'd have:
— —
Slide the buy-year back to 2011 and the same $1,000 becomes life-changing; slide it to a market top and you'd have waited years just to break even. That spread — the same asset, wildly different outcomes by timing alone — is the whole story of Bitcoin as an investment.
Honesty notes. §1 and §2 are computed from Bitcoin's actual protocol rules (the 21M cap, the halving schedule, the 10-minute target and difficulty retarget) — exact, not estimated. §3 and §4 use approximate year-end prices (rounded, for shape, not accounting) and the “price you hold until” is one you set — I won't fabricate a current figure. Nothing here is financial advice; bitcoin is extremely volatile and has fallen 80%+ more than once. Everything is recomputed live from what you drag.