Bitcoin Halving
Quick Answer
A Bitcoin halving is a programmed event that permanently reduces the reward miners receive for validating new blocks by 50%, occurring approximately every four years until the maximum supply of 21 million Bitcoin is reached.
Definition
A Bitcoin halving is a programmed event that permanently reduces the reward miners receive for validating new blocks by 50%, occurring approximately every four years until the maximum supply of 21 million Bitcoin is reached.
Explanation
The Bitcoin halving is a core mechanism of Bitcoins monetary policy, encoded in the protocol by its creator Satoshi Nakamoto. Unlike central banks that can print money at will, Bitcoins supply schedule is fixed and predictable. The block reward started at 50 BTC per block in 2009, and halvings have occurred in 2012 (to 25), 2016 (to 12.5), 2020 (to 6.25), 2024 (to 3.125), with the next expected around 2028. The final halving is projected to occur around 2140 when the last Bitcoin is mined.
Historically, each halving has been followed by a significant Bitcoin price increase over the following 12-18 months, though past performance does not guarantee future results. The reduced supply of new Bitcoin entering the market creates selling pressure that tends to decrease over time, and if demand remains constant or increases, the price adjusts upward. Each halving reduces Bitcoins inflation rate, making it increasingly scarce.
Halvings also impact Bitcoin miners. When the block reward is cut in half, miners with higher electricity costs or less efficient hardware may become unprofitable and exit the network. The network difficulty adjusts downward to compensate, restoring profitability for remaining miners. This process ensures that only the most efficient miners survive, maintaining network security. The halving mechanism makes Bitcoin uniquely disinflationary among global assets.
Example
After the 2024 halving, the Bitcoin block reward dropped from 6.25 BTC to 3.125 BTC per block, reducing daily new Bitcoin supply from ~900 to ~450 BTC — equivalent to cutting the new supply entering the market by half overnight.