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Bitcoin mining earns 1/2 as many bitcoins every 4 years. The reward for mining a block of transactions started at 50 bitcoins in 2009. Dropped to 25 in 2012, 12.5 in 2016, and 6.25 in 2020. Sometime in May 2024, the block reward will drop to 3.125 BTC.
https://amycastor.com/2024/02/21/the-halvening-is-coming-what-this-means-for-bitcoin/