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This question already has an answer here:

I know that when someone is able to find a block and hash that can be attached to the chain, he will be awarded with "newly found bitcoins"

However, isn't mining simply finding the hash? Where do these new bitcoins come from?

marked as duplicate by Nate Eldredge, Nick ODell Mar 27 '15 at 20:03

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On a high level, the entire bitcoin network is built on the fact that all of the nodes are following the same rules. The rules state that whoever hashes the next block gets to mint a number of coins, so they can.

From the Bitcoin white paper:

By convention, the first transaction in a block is a special transaction that starts a new coin owned by the creator of the block. This adds an incentive for nodes to support the network, and provides a way to initially distribute coins into circulation, since there is no central authority to issue them.

From the wiki:

Bitcoins are created each time a user discovers a new block. The rate of block creation is approximately constant over time: 6 per hour. The number of Bitcoins generated per block is set to decrease geometrically, with a 50% reduction every four years. The result is that the number of Bitcoins in existence will never exceed 21 million.

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