Digital currency payment transfer in order to facilitate easy payment and give the payee more confidence in not letting go of their electronic wallet during the transaction. A cryptocurrency is a type of digital asset that relies on cryptography for chaining together digital signatures of asset transfers, peer-to-peer networking and decentralization. In some cases a proof-of-work or proof-of-stake scheme is used to create and manage the currency. Cryptocurrencies allow electronic money systems to be decentralized. The first and most popular system is bitcoin, a peer-to-peer electronic monetary system based on cryptography. A virtual currency has been defined in 2012 by the European
Currency War of 2009–11 a source of contention, concerns over currency war had receded, along with signs that major currencies such as the Renminbi were now much less undervalued than they had been a year previously. Brazil currency had fallen substantially from its peak value against the dollar, allowing Mantega to begin rolling back anti-appreciation measures. In July, the IMF downgraded its assessment of the degree to which the Renminbi is undervalued from "substantially" to "moderately". However, Chinese officials were not pleased, suggesting that their exchange rate is no longer undervalued at all. Whereas in the US, presidential candidate Mitt Romney retains his pledge