For every block a miner adds to the blockchain, he or she is rewarded with a certain amount of newly-created Bitcoin. Yet there is also a finite number of Bitcoins that can ever be created. In order to extend the life of Bitcoin and ensure that it remains a deflationary asset, Satoshi Nakamoto wrote into Bitcoin’s code that the supply of new BTC awarded to miners is halved every 210,000 blocks, or roughly every 4 years. For this reason, Bitcoin halvings serve as major milestones in Bitcoin’s timeline, dividing it into distinct periods.