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Dec 12, 2017 at 14:02 comment added user3223162 The idea is as follows: there will be a contract that will mint the tokens. The number of voters is well known (n - the total number of voters). Any new user is able to withdraw a single token from the mint. The withdrawal history can be tracked by keeping track if an address has withdrawn it's token from the mint. If an address tries to withdraw a token from the mint twice, it will fail. However, this only makes sense if only a single address can be derived from a public key. A balance variable can't solve this issue if the opposite is true.
Dec 12, 2017 at 11:13 history answered Mundi CC BY-SA 3.0