One of the first digital currencies to utilize peer-to-peer technology to enable instant payments is Bitcoin. Bitcoin "miners", who are independent entities and companies that own the computing power necessary to process transactions on the Blockchain, are motivated by both rewards (the release or payment in Bitcoin) as well as transaction fees.
These miners could be described as the decentralized authority who enforces the credibility and integrity of Bitcoin networks. New bitcoins can be released to miners at a fixed rate but it is constantly declining. There are 21 million Bitcoins available to be mined. The total number of bitcoins that can still be mined is 21 million.

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