What is the Bitcoin Halving?
An event that occurs every 210,000 blocks (approximately every four years) where the reward for mining a new block is cut in half. This is how Bitcoin enforces its fixed supply cap of 21 million coins.
Why It Matters
The halving is Bitcoin's scarcity mechanism. While governments can print unlimited money, Bitcoin's supply is algorithmically capped at 21 million coins, with halvings guaranteeing scarcity enforcement. Each halving reduces the rate at which new bitcoin enters circulation. The first halving cut mining rewards from 50 to 25 bitcoin per block, the second from 25 to 12.5, and so on. Eventually, rewards will round down to zero, and no new bitcoin will be created. This predictable scarcity is radically different from traditional currency and drives long-term value. Historically, Bitcoin has entered bull markets within 6-12 months after halvings, though this isn't guaranteed. Understanding halvings helps you grasp why Bitcoin's supply is fundamentally different from government-printed money.
How It Works
Bitcoin's mining reward started at 50 bitcoin per block. Every 210,000 blocks (approximately every 4 years), that reward is cut in half. After the first halving, miners earned 25 BTC per block. The second halving cut it to 12.5 BTC. The third to 6.25 BTC. The fourth halving in April 2024 cut it to 3.125 BTC. These halvings continue until the reward eventually rounds down to zero, which will occur around the year 2140. At that point, Bitcoin miners will be paid entirely through transaction fees rather than block rewards. The halving is encoded directly into Bitcoin's code and happens automatically when the network reaches the specified block height.