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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William Jackson, chief emerging markets economist at Capital Economics, says the US president's aim is to "revive Venezuela's oil sector and use that energy to increase supply and reduce costs to the consumer, possibly providing a source of revenue for a more friendly Venezuelan government to rebuild the economy after years of mismanagement".