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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 social networking sites.175 An earlier"Investor Alert" warned about the usage of bitcoin in Ponzi schemes.176
The self-regulatory organization FINRA and the North American Securities Administrators Association have both issued investor alerts 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 Dealers in the U.S., the U.K, South Korea, and possibly 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 potential manipulation during futures settlement dates. The final settlement price of CME bitcoin futures is determined by costs on four exchanges, Bitstamp, Coinbase, itBit and Kraken. Following the initial shipping date in January 2018, the CME asked extensive detailed trading information however a few of those exchanges refused to provide it and later 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 price manipulation occurred during the Mt Gox bitcoin theft and that the market remains vulnerable to manipulation.186 The history of hacks, fraud and fraud involving bitcoin dates back to at least 2011.187
Research by John M. Griffin and Amin Shams in 2018 suggests 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 purchase price increase in bitcoin in overdue 2017.188189
J.L. van der Velde, CEO of Bitfinex and Tether, denied the claims of price manipulation:"Bitfinex nor Tether is, or has , engaged in any sort 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
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The Bank for International Settlements Website summarized 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 bad security and fraud at cryptocurrency exchanges, vulnerability to debasement (from forking), and the influence of miners.191192193.
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The Economist wrote in 2015 these criticisms are unfair, predominantly since the unethical image may compel users to overlook the capabilities 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 like 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 amenities, the combined power consumption would be 166.7 megawatts (1.46 terawatt-hours annually ).133
In the end of 2017, the global bitcoin mining activity has been estimated to consume between one and four gigawatts of electricity.205 Politico noted that the even high-end estimates of bitcoin's overall consumption levels amount to only approximately 6% of the entire energy consumed by the global banking industry, and even if bitcoin's consumption levels increased 100 fold from the current levels, bitcoin's consumption would still only amount to about 2% of global electricity consumption.206.
To lower the expenses, bitcoin miners have put up in places 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 i was reading this (state), and Austria to decrease electricity costs.206208209210 Miners are drawn to providers like Hydro Quebec who 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.