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The crypto equivalent of a locked box. A cryptographic primitive for bit commitment, with the properties that a blob can represent a 0 or a 1, that others cannot tell be looking whether it is a 0 or a 1, that the creator of the blob can "open" the blob to reveal the contents, and that no blob can be both a 1 and a 0. An example of this is a flipped coin covered by a hand.