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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Security officials "hugely underestimated the crowd", says Basanta Basnet, editor of Nepal's daily online news portal Online Khabar. "I spoke to security personnel, and also to members of the political class - they said that 'children' were joining."