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Re:Bitcoin Mining Now Consuming More Electricity Than Many C... by ams6110 on Wednesday November 22, 2017 @04:16PM (#15760736)
Gold meets your requirements, except for working online.
Re:Bitcoin Mining Now Consuming More Electricity Than Many C... by emiliobumachar on Wednesday November 22, 2017 @05:11PM (#15761138)
Literal mining is messy. It's hard to compare, but i'd guess Bitcoin is greener.