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NeuCoin is a decentralized peer-to-peer cryptocurrency derived from SunnyKing's Peercoin, which itself was derived from Satoshi Nakamoto's Bitcoin. Aswith Peercoin, proof-of-stake replaces proof-of-work as NeuCoin's securitymodel, effectively replacing the operating costs of Bitcoin miners(electricity, computers) with the capital costs of holding the currency.Proof-of-stake also avoids proof-of-work's inherent tendency towardscentralization resulting from competition for coinbase rewards among minersbased on lowest cost electricity and hash power.  NeuCoin increases security relative to Peercoin and other existingproof-of-stake currencies in numerous ways, including: (1) incentivizing nodesto continuously stake coins over time through substantially higher miningrewards and lower minimum stake age; (2) abandoning the use of coin age in themining formula; (3) causing the stake modifier parameter to change over timefor each stake; and (4) utilizing a client that punishes nodes that attempt tomine on multiple branches with duplicate stakes.  This paper demonstrates how NeuCoin's proof-of-stake implementation addressesall commonly raised "nothing at stake" objections to generic proof-of-stakesystems. It also reviews many of the flaws of proof-of-work designs tohighlight the potential for an alternate cryptocurrency that solves theseflaws.

NeuCoin: the First Secure, Cost-efficient and Decentralized Cryptocurrency