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The U.S. Securities and Exchange Commission has also issued warnings. A May 2014"Investor Alert" warned that investments involving bitcoin may have high rates of fraud, and that investors may be solicited on interpersonal media sites.175 An earlier"Investor Alert" warned about the use of bitcoin in Ponzi schemes.176

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The European Banking Authority issued a warning in 2013 focusing on the lack of regulation of bitcoin, the chance that exchanges could be hacked, the volatility of bitcoin's price, and general fraud.148

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

An official investigation into bitcoin traders 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 Traders in the U.S., the U.K, South Korea, and maybe other countries are being investigated. Brett Redfearn, head of the U.S.

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The U.S. federal investigation was motivated 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 first delivery date in January 2018, the CME asked extensive detailed trading information however a few of those exchanges refused to supply it and afterwards provided only limited information.

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

Academic research published in the Journal of Monetary Economics concluded that cost 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 2011.187

Research by John M. Griffin and Amin Shams in 2018 indicates that trading associated with increases in the amount of the Tether cryptocurrency and related trading at the Bitfinex exchange account for about half of the price increase in bitcoin in late 2017.188189

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

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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 price, the high energy consumption, high and variable transactions costs, the poor security and fraud in cryptocurrency exchanges, vulnerability great post to read to debasement (from forking), and the influence of miners.191192193.

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The Economist wrote in 2015 that these official website criticisms are unfair, predominantly because the unethical image may induce users to forget 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 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 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 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 though all miners used modern facilities, the combined power consumption would be 166.7 megawatts (1.46 terawatt-hours per year).133

In the end of 2017, the global bitcoin mining activity was estimated to consume between one and four gigawatts of power.205 Politico noted that the even high-end estimates of bitcoin's total consumption levels amount to only approximately 6% of the total energy consumed by the global banking sector, and even when bitcoin's consumption levels increased 100 fold from today's levels, bitcoin's consumption would still only amount to approximately 2% of global power consumption.206.

To reduce the expenses, bitcoin miners have set up in places like Iceland where geothermal energy is cheap and cooling Arctic air is free.207 Bitcoin miners are known to use hydroelectric power in Tibet, Quebec, Washington (state), and Austria to reduce electricity prices.206208209210 Miners are drawn to providers like Hydro Quebec who have energy surpluses.211 According to a University of try this site Cambridge study, much of bitcoin mining is done in China, where electricity is subsidized by the government.212213.

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