Bitcoin Halvings: A Look at the Mechanism and Its Impact
The Bitcoin halving mechanism reduces the block reward by 50% every 210,000 blocks, or approximately once every four years. This decrease in supply growth is a key aspect of Bitcoin's protocol and has occurred four times so far: November 2012 (50 to 25 BTC), July 2016 (25 to 12.5 BTC), May 2020 (12.5 to 6.25 BTC), and April 2024 (6.25 to 3.125 BTC). The fifth halving is expected in early 2028.
The block reward reduction has a significant impact on the network's supply dynamics, with each halving decreasing the annual issuance rate. Before the 2024 halving, miners produced approximately 328,500 new BTC per year, while after it, that figure dropped to around 164,250. This decrease in supply growth is a key factor why economists and traders pay attention to the halving mechanism.
The stock-to-flow model, popularized by PlanB, attempts to quantify the relationship between supply and demand. However, its predictive accuracy has weakened significantly since 2022, and most institutional analysts treat it as one signal among many rather than a reliable forecast. The fact that Bitcoin often rallies in the months after a halving suggests either that markets are not fully efficient or that other catalysts coincide with the halving cycle.