Unable to build a meaningful arbitrage cloud for PPC with USD as a base currency. Please select another coin or pick a different base currency. A peer-to-peer crypto-currency design derived from Satoshi Nakamotos Bitcoin. Proof-of-Stake replaces Proof-of-Work to provide most of the network security. Under this hybrid design proof-of-work mainly provides initial minting and is largely non-essential in the long run. Security level of the network is not highly enery dependent thus providing an energy efficient and more cost-competitive peer-to-peer crypto-currency. Proof-of-Stake is based on coin age and generated by each node via a hashing scheme bearing similarity to Bitcoins but over limited search space. Block chain history and transaction settlement are further protected by a centrally broadcasted checkpoint mechanism.. PeerCoin is is one of many evolving digital currencies in which encryption is used to regulate the generation of units of currency and verify the transactions independently of a central authority. It is traded on 21 exchanges including Bleutrade, TradeSatoshi, Cryptopia, HitBTC, LiveCoin and Coinse in multiple currencies such as BTC, USDT, UNO, USD and othersXMR.