Big-Coin is inovative network of digital currency wich have a Capital Gain wich increasing progressively in line with market demand. Big-coin using QR technology to operate, with no central authority or central banks; transaction management and big-coin issuance carried out collectively by the network. Big-coin an open-source; the design of a general nature, nobody who owns and controls the Big-coin and everyone can take part. With its unique, Bigcoin allows the ways of use that can not be done by any previous payment system.