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It’s hardcoded, based on the number of blocks in the blockchain. On 1, it’s true that in different forks, different miners will have been rewarded. However, over time only one of the forks will become the accepted consensus for confirmed transactions. And http://lukasbayu910.iamarrows.com/bitcoin-price-btc-chart-and-market-cap so only the miners from one fork will be able to redeem their transactions. However, as a number of people have pointed out in fact there are in any case small differences in the blocks being hashed by different miners, and that’s sufficient to make this a non-issue. Bitcoin designers wanted a way to spread bitcoins around without starting with a central authority that has them all and gives them out .