Block reward halving

Block reward halving is a term that refers to the reduction of block rewards by 50%, according to the rules set in a blockchain’s protocol. This is a key element of a network's crypto-economics that determines the token supply. For example, Bitcoin's halving occurs every 210,000 blocks, which takes roughly four years. After four halvings, Bitcoin's current block reward is reduced from 50 to 3.125 BTC.

Check the Halvings Page for scheduled block reward halving events.