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'' The self-regulatory organization FINRA and the North American Securities Administrators Association have both issued investor alarms about bitcoin.177178

An official investigation into bitcoin dealers has been reported in May 2018. The U.S. Justice Department launched an investigation into potential price manipulation, including the techniques of spoofing and scrub transactions.180181182 Dealers in the U.S., the U.K, South Korea, and maybe other countries are being investigated. Brett Redfearn, head of the U.S.

The U.S. national investigation was prompted by concerns of possible manipulation during futures settlement dates. The final settlement price of CME bitcoin futures contract is determined by costs on four exchanges, Bitstamp, Coinbase, itBit and Kraken. Following the initial shipping date in January 2018, the CME requested extensive detailed trading information however a few of those exchanges refused to provide it and later provided only limited data.

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State and provincial securities authorities, coordinated throughout the North American Securities Administrators Association, are investigating"bitcoin scams" and ICOs in 40 jurisdictions.185

Academic study published in the Journal of Monetary Economics concluded that price manipulation happened during the Mt Gox bitcoin theft and that the marketplace remains vulnerable to manipulation.186 The background of hacks, fraud and theft involving bitcoin dates back to 2011.187

Research by John M. Griffin and Amin Shams in 2018 suggests that trading related to increases in the amount of the Tether cryptocurrency and related trading at the Bitfinex exchange account for roughly half of the purchase price increase in bitcoin in overdue 2017.188189

J.L. van der Velde, CEO of both Bitfinex and Tether, denied the claims of price manipulation:"Bitfinex nor Tether is, or has ever, engaged in any kind of market or cost manipulation. Tether issuances cannot be used to prop up the price of bitcoin or any other coin/token on Bitfinex. "190

The Bank for International Settlements outlined several criticisms of bitcoin in Chapter V of their 2018 annual report. The criticisms include the lack of equilibrium in bitcoin's cost, the high energy consumption, high and variable transactions costs, the poor security and fraud at cryptocurrency exchanges, vulnerability to right here debasement (from forking), and the influence of miners.191192193.

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The Economist wrote in 2015 that these criticisms are unfair, predominantly since the shady image may induce users to overlook the capabilities of their 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 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 York University known as bitcoin that 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 said similar views, as have business executives such as Jamie Dimon and Jack Ma.204.

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Bitcoin has been criticized for the amount of electricity consumed by mining. As of 2015update, The Economist estimated that even if all miners used modern amenities, the combined power consumption would browse around here be 166.7 megawatts (1.46 terawatt-hours per year).133

At the end of 2017, image source the global bitcoin mining activity has been estimated to consume between one and four gigawatts of power.205 Politico noted that the even high-end estimates of bitcoin's overall consumption levels amount to only approximately 6% of the entire power consumed by the global banking industry, and even when bitcoin's consumption levels increased 100 fold from the current levels, bitcoin's consumption would still only amount to about 2% of international power consumption.206.

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To lower the expenses, bitcoin miners have set up in places like Iceland where geothermal 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 reduce electricity costs.206208209210 Miners are drawn to providers such as Hydro Quebec that have energy surpluses.211 According to a University of Cambridge study, much of bitcoin mining is done in China, where electricity 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, said 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 that bitcoin may be a pyramid scheme; it concluded that,"Since in the case of bitcoin the normal guarantees of profits are lacking, it cannot be presumed that bitcoin is a pyramid scheme" In July 2017, billionaire Howard Marks referred to bitcoin as a pyramid scheme.221.

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