"a real Ponzi scheme takes fraud; bitcoin, by contrast, seems more like a collective delusion." 213 A 2014 report by the World Bank concluded that bitcoin was not a deliberate Ponzi. Archived from the original on 19 December 2013. 143 In 2014, Bloomberg named bitcoin one of its worst investments of the year. Archived (PDF) from the original on Retrieved 3 September 2016. "Designing Proof of Human-Work Puzzles for Cryptocurrency and Beyond". Retrieved 17 December 2013. Archived from the original on Retrieved McCoy, Kevin.
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Archived from the forex news feed original on Retrieved llison, Ian. 158 During their time as bitcoin developers, Gavin Andresen 159 and Mike Hearn 160 warned that bubbles may occur. Archived from the original on Retrieved several experts told The Washington Post that bitcoin probably uses as much as 1 to 4 gigawatts, or billion watts, of electricity, roughly the output of one to three nuclear reactors. Full clients verify transactions directly by downloading a full copy of the blockchain (over 150 GB As of January 2018). "Warren Buffett and Jamie Dimon on bitcoin: Beware". Mmodity Futures Trading Commission. Archived (PDF) from the original on Retrieved b Wolff-Mann, Ethan. "US regulator Bitcoin Exchanges Must Comply With Money Laundering Laws". "Secure Bitcoin Storage: A Q A With Three Bitcoin Company CEOs". 144 In 2015, bitcoin topped Bloomberg's currency tables.
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