BFM (B4 flash memory) is a new cryptocurrency based on Conditioned Proof of Capacity (cpoc). Its main characteristics are to use the B4 flash memory chip as a consensus participant, reduce the loss of temperature on the miner chip, improve the speed of chip rewriting and reading, provide the highest reliable storage, etc., so as to reduce the consumption of encrypted currency on power resources, reduce the threshold of participation, make its production mode more decentralized, and more secure and credible, so that everyone can participate with the mining of cryptocurrencies, credit and value are generated through mathematical algorithms and distributed mining.