Blockchain technology was originally invented in 1991 by two mathematicians, Stuart Haber and W. Scot Stornetta. They first proposed the system to ensure that timestamps could not be tampered with.
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At least 15 people have been killed and others injured after a Bolivian air force cargo plane crashed in the western city of El Alto, the country's authorities say.
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The last shooting recorded by the BBC takes place at about 16:00, and the protest outside parliament dies down at dusk. But smaller sporadic protests continue through the night.。夫子对此有专业解读
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