Halving

A pre-programmed Bitcoin event occurring every 210,000 blocks (~4 years) that cuts the block reward for miners in half, reducing the rate of new Bitcoin issuance.

Bitcoin's supply schedule is hardcoded: every 210,000 blocks (approximately four years), the reward paid to miners for validating transactions is cut in half. Bitcoin launched with a 50 BTC block reward; it halved to 25 BTC in 2012, to 12.5 in 2016, to 6.25 in 2020, and to 3.125 in April 2024. This continues until around 2140, when the 21 million maximum supply will be fully issued and miners are compensated solely by transaction fees.

The halving is significant because it cuts the new supply of Bitcoin being created and sold by miners by 50% overnight, while demand (theoretically) remains constant or grows. Basic supply and demand logic suggests this should be bullish for price. Historically, each of the four halvings has been followed by significant Bitcoin price appreciation in the 12–18 months after the event, though the magnitude has diminished as Bitcoin's market cap has grown. Critics note that halvings are fully known years in advance and should theoretically be priced in, yet market behavior has consistently rewarded long holders through the halving cycle.

The halving is the primary mechanism ensuring Bitcoin's scarcity and disinflationary monetary policy — a sharp contrast to fiat currencies where central banks can increase money supply discretionarily.

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