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May 14, 2016, 02:32:07 PM |
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Bitcoin Core uses the oldest inputs first since it has the most confirmations and thus a higher priority, I believe there are more than this.
If I were to choose inputs, I would use the oldest inputs first to have a higher priority when I am making a free transaction. Next, I would prefer to spend the UXTOs which can be spent completely, i.e. there will be no change. This reduces the size occupied by the one additional output.
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