Microsoft's (Bill Gates) Patent# WO 2020 060606, human implant Cryptocurrency system using body activity data. This patented technology is designated for all countries (see designated States, in the Patent)
https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2020060606
https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2020060606