https://ia803409.us.archive.org/26/items/brevet-wo-2020060606-a-1-cryptocurrency-system-using-body-activity-data/%5BBrevet%5D%20WO%202020060606%20A1%20-%20Cryptocurrency%20System%20Using%20Body%20Activity%20Data_text.pdf

From the document:

> Instead of massive computation work required by some conventional cryptocurrency systems, data generated based on the body activity of the user can be a proof-of-work, and therefore, a user can solve the computationally difficult problem unconsciously.

This patent has some interesting things going for it:

- It's patent number 060606 (or, 666)

- Granted March 26th, 2020

- To Microsoft

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