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The self-regulatory organization FINRA and the North American Securities Administrators Association have issued investor alerts about bitcoin.177178
An official investigation into bitcoin traders was reported in May 2018. The U.S. Justice Department launched an investigation into possible price manipulation, including the techniques of spoofing and wash trades.180181182 Traders in the U.S., the U.K, South Korea, and possibly other countries are being investigated. Brett Redfearn, head of the U.S.
The U.S. federal investigation was prompted by concerns of possible manipulation during futures settlement dates. The final settlement price of CME bitcoin futures is determined by prices on four exchanges, Bitstamp, Coinbase, itBit and Kraken. Following the initial delivery date in January 2018, the CME asked extensive detailed trading information but several of those exchanges refused to supply it and afterwards provided only limited information.
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Academic research published in the Journal of Monetary Economics concluded that price manipulation occurred during the Mt Gox bitcoin theft and that the marketplace remains vulnerable to manipulation.186 The history of hacks, fraud and fraud involving bitcoin dates back to at least 2011.187
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Research by John M. Griffin and Amin Shams in 2018 suggests that trading related to increases in the amount of the Tether cryptocurrency and associated trading at the Bitfinex exchange account for about half of the purchase price increase in bitcoin in late 2017.188189
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The Economist wrote in 2015 these criticisms are unfair, predominantly since the unethical image may induce users to overlook the capacities of the blockchain technology, but also on account of the fact that the volatility of bitcoin is changing in time.194
Bitcoin and other cryptocurrencies have been identified as economic bubbles by at least eight Nobel Memorial Prize in Economic Sciences laureates, including Robert Shiller,195 Joseph Stiglitz,196 and Richard Thaler.19713 Noted Keyensian economist Paul Krugman wrote in his New York Times column criticizing bitcoin, calling it a bubble and a fraud;198 and professor Nouriel Roubini of New look at these guys York University known as bitcoin the"mother of all bubbles. "199 Central bankers, including former Federal Reserve Chairman Alan Greenspan,200 investors like Warren Buffett,201202 and George Soros203 have stated similar views, as have business executives like Jamie Dimon and Jack Ma.204.
Bitcoin has been criticized for the amount of electricity consumed by mining. As of 2015update, The Economist estimated that even if all miners utilized modern amenities, the combined electricity consumption would be 166.7 megawatts (1.46 terawatt-hours per year).133
At the end of 2017, the worldwide bitcoin mining activity has been estimated to consume between one and four gigawatts of electricity.205 Politico noted that the even high-end quotes of bitcoin's total consumption levels amount to only about 6 percent of the entire power consumed by the international banking industry, and even if bitcoin's consumption levels increased 100 fold from today's degrees, bitcoin's consumption would still only amount to about 2% of global electricity consumption.206.
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To lower the costs, bitcoin miners have set up in areas like Iceland where renewable energy is economical and cooling Arctic air is free.207 Bitcoin miners are known to utilize hydroelectric power in Tibet, Quebec, Washington (state), and Austria to decrease electricity costs.206208209210 Miners are drawn to providers such as Hydro Quebec that have energy surpluses.211 According to a University of Cambridge study, a lot of bitcoin mining is done in China, where power is subsidized by the government.212213.
A variety of journalists,207214 economists,215216 and the central bank of Estonia217 have voiced concerns which bitcoin is a Ponzi scheme. In 2013, Eric Posner, a law professor at the University of Chicago, stated that"a true Ponzi scheme takes fraud; bitcoin, by contrast, seems more like a collective delusion. "218 A 2014 report from the World Bank concluded that bitcoin was not a deliberate Ponzi scheme.219:7 The Swiss Federal Council220:21 examined the concerns which bitcoin may be a pyramid scheme; it concluded that,"Since in the example of bitcoin the typical promises of gains are lacking, it cannot be assumed that bitcoin is a pyramid scheme" In July 2017, billionaire Howard Marks referred to bitcoin as a pyramid scheme.221.