⏳ Explorer lab
Halving & Supply Clock
Drag through time to see Bitcoin's block reward halve and total supply creep towards 21 million.
💡
The analogy
A gold mine whose yield is cut in half every four years, forever.
200920262140
Total supply (BTC)
Block reward by era (BTC)
⛏️ The miner's squeeze
After each halving, miners earn half as many BTC per block. Their costs (electricity) don't halve.
🧠 What this lab teaches
- Reward halves every 210,000 blocks (~4 years).
- Supply approaches 21M asymptotically — last fractions ~2140.
- Halvings squeeze miner margins.
- Lower issuance ≠ guaranteed higher price.
📚 Go deeper
🔒 This simulator runs entirely in your browser with fictional data. Never type a real seed phrase or private key into any website.