Peercoin

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Peercoin, also known as PPCoin or PPC, is a peer-to-peer cryptocurrency utilizing both POS and POW systems. In the proof-of-stake system, new coins are generated based on the holdings of individuals. In other words, someone holding 1% of the currency will generate 1% of all proof-of-stake coin blocks. This has the effect of making a monopoly more costly, and separates the risk of a monopoly from proof-of-work mining shares.