A recent patent application seems to suggest that Microsoft is working on a proof-of-work algorithm that uses brain waves (and other biometric data) to mine cryptocurrency. In the patent, titled "Cryptocurrency System Using Body Activity Data," Microsoft proposes using a sensor on the user's body that will transmit "body activity" data, such as brain activities, blood flow, and movements, which would then be transmitted to a server. Users would be encouraged to perform tasks, and 'a brain wave or body heat emitted by the user when the user performs the task provided by an information or service provider, such as viewing an advertisement or using certain Internet services may be used in the mining process. "This activity would replace the "mass computational work" required by normal cryptocurrency mining, the data collected by body activity is considered as proof of work.