Mining, difficulty & the halving

A lottery where every ticket costs electricity — and the prize shrinks every four years.

Explorer · 8 min · Updated 2026-11-08

💡 A gold mine that halves its yield

Imagine a gold mine that releases a fixed amount every 10 minutes, shared by whoever digs fastest. If more diggers arrive, the rock gets harder so the pace stays the same. And every four years, the mine's output is cut in half — on schedule, forever. That's Bitcoin mining: difficulty adjusts to keep the pace, and the halving makes new coins scarcer.

What miners actually do

Miners bundle transactions into a candidate block and repeatedly hash it with a changing number (the nonce) until the result is below a target — like rolling dice until you get a number smaller than 10. There is no shortcut: the only way is trial and error, which costs electricity. That cost is what makes rewriting history expensive.

Difficulty adjustment

Every 2,016 blocks (about two weeks), the network checks how fast blocks came. Too fast → the target gets harder. Too slow → easier. That's why adding more machines doesn't create more bitcoin — it just raises difficulty.

The halving schedule

Halvings happen every 210,000 blocks. By late 2026 roughly 95% of all bitcoin that will ever exist has been mined; the last fractions arrive around the year 2140. After that, miners would be paid only by transaction fees.

Does the halving make the price go up?

It reduces new supply, but price depends on demand too. Past halvings were followed by rallies, but with only four examples and many other factors (ETFs, interest rates, regulation), it's not a law of nature. Treat any "halving = guaranteed pump" claim with suspicion.

🧮 Practical example: daily new supply

Key takeaways

• Mining = repeated hashing to find a valid block.
• Difficulty retargets every 2,016 blocks.
• Halvings every 210,000 blocks cut new supply in half.
• Halving ≠ guaranteed price rise.

Education only — not financial advice.