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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In Fincke's Wednesday statement, he described the evacuation as allowing him to get advanced medical imaging that wasn't available at the station. He thanked the staff at Scripps Memorial Hospital La Jolla near San Diego, California, who checked him out upon the crew's splashdown.