Microsoft has patented a cryptocurrency mining system that leverages human activities, including brain waves and body heat, when performing online tasks such as using search engines, chatbots, and reading ads. “A user can solve the computationally difficult problem unconsciously,” the patent reads.

"A brain wave or body heat emitted from the user when the user performs the task provided by an information or service provider, such as viewing advertisement or using certain internet services, can be used in the mining process."

Read full article:  https://news.bitcoin.com/microsoft-cryptocurrency-system/#:~:text=Microsoft%20Technology%20Licensing%2C%20the%20licensing,on%20June%2020%20last%20year.