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now what we need is a bit-tally-stick to handle IOU's in bitcoin the way that split tally sticks were used to handle IOU's in medieval times. In this way I could loan out the same money I have several times, with the assumption that I get it back before I have to pay it out really.

This may sound a bit far-fetched but there were cases in the Middle Ages of artisans doing exactly that. In fact sometimes they'd even issue their own token-based currency and settle the accounts with other artisans after market day.....

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