TopicGrowing
Bitcoin mining
This section is growing. We only publish what we can source, so it starts lean.
Proof-of-work
The white paper describes blocks secured by proof-of-work, where rewriting history means redoing the work of every later block (Bitcoin white paper, §4). Our section-by-section summary explains it.
Halvings and supply
Four halvings have occurred, the latest at block 840,000 on April 20, 2024, cutting the subsidy to 3.125 BTC (blockstream.info). See every halving on our timeline and how each one cuts new supply on the supply schedule page.
Bitcoin Core caps total supply at 21 million BTC (MAX_MONEY in amount.h).