2026-09-03
Bitcoin Halving Explained: What It Is and Why It Matters
Every four-ish years, something happens to Bitcoin that gets treated like a religious holiday by half of crypto Twitter: the halving. The reward miners get for adding a new block to the blockchain gets cut exactly in half. That’s it. That’s the whole event. No ceremony, just a number in the code doing what it was always programmed to do.
Why it exists at all
Satoshi built a hard cap into Bitcoin: only 21 million will ever exist. New coins get created as a reward for mining, but that reward shrinks on a schedule — halving roughly every 210,000 blocks, which works out to about every four years. It started at 50 BTC per block in 2009, dropped to 25 in 2012, 12.5 in 2016, 6.25 in 2020, and 3.125 in 2024. Eventually it rounds down to zero, sometime around the year 2140, and miners will earn purely from transaction fees instead.
What it actually changes
Directly, only one thing: the rate at which new Bitcoin enters circulation slows down. Miners still process transactions and secure the network, they just get paid fewer newly-minted coins for doing it (transaction fees make up the difference over time). It’s a supply-side event, full stop.
The myth that needs retiring
“Halving cuts supply, so price must go up” gets repeated every single cycle like it’s a law of physics. It’s not. Yes, previous halvings have been followed by major price increases — 2012, 2016, and 2020 all preceded bull runs. But correlation isn’t the same as guaranteed causation, and each of those cycles also had other things going on: growing adoption, new exchanges, macro conditions, and plain old speculation feeding on itself. A slower supply increase can support a price rise if demand holds steady or grows, but it doesn’t force one. Demand still has to show up.
There’s also a quieter effect worth mentioning: as the block reward shrinks, mining a given amount of Bitcoin gets less profitable unless the price rises to compensate, or miners get more efficient, or transaction fees pick up the slack. Some smaller mining operations shut down after every halving because the economics stop working for them — which briefly makes the network less distributed until the more efficient players absorb the difference.
So the halving is real, it’s predictable, and it’s one input into Bitcoin’s supply story. Whether that supply story is actually a good reason to hold the asset is a completely separate question. Chapter 6, “Can Someone Print More Bitcoin?”, in The Bitcoin Skeptic’s Guide spends real time on exactly this, without assuming scarcity automatically equals value.