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@ -520,7 +520,8 @@ to be directed graphs, since there are always funds which are unspent |
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becoming spent, i.e. a direction associated with each transaction. |
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This direction can be mathematically defined using the timestamp |
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of the transaction. Inputs are unspent at the time of the transaction |
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and outputs are spent at the time of the transaction. |
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and become spent after the transaction. Outputs do not exist before |
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the transaction and are unspent after the transaction. |
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There is a great deal of mathematical history devoted to the study |
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of \textbf{graph theory} that has not been applied to blockchain analysis, |
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