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There’s a BitcoinTalk post from May 19, 2013, discussing a “Proof of Human” coin.
| $20.09% | |
| $0.350.02% | |
| $0.170.01% | |
| $0.120.01% | |
| $0.090.00% | |
| $0.070.00% | |
| $0.050.00% |