BitCoin is not so much a "currency" as an "emergent phenomenon". It makes things possible that have nothing to do with money. For example, let’s say that you have a screen-play for a movie. Before shopping it around in Hollywood, you want to prove that it’s yours, so that a greedy producer can't steal it. Using BitCoin, you can add the signature (and date) of your screen-play to the "block chain",
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