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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 traders was 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.
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 first delivery date in January 2018, the CME requested extensive detailed trading information however several of the exchanges refused to provide it and afterwards provided only limited data.
Academic study 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 2011.187
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Research by John M. Griffin and Amin Shams in 2018 indicates 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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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 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 stability in bitcoin's price, the high energy consumption, this hyperlink high and variable transactions costs, the bad security and fraud in 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 shady image may compel users to forget the capacities 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 called bitcoin the"mother of all bubbles. "199 Central bankers, including former Federal Reserve Chairman Alan Greenspan,200 investors such as 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 though all miners utilized modern amenities, the combined power consumption would be 166.7 megawatts (1.46 terawatt-hours annually ).133
At 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 quotes of bitcoin's total consumption levels amount to only about 6 percent of the entire energy consumed by the global banking sector, and even if bitcoin's consumption levels increased 100 fold from today's levels, bitcoin's consumption would still only amount to approximately 2% of international electricity consumption.206.
To reduce the expenses, bitcoin miners have put up in areas 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 that have energy surpluses.211 According to a University of Cambridge study, much of bitcoin mining is done in China, where electricity has been subsidized by the government.212213.
A variety of journalists,207214 economists,215216 and the central bank of Estonia217 have voiced concerns that bitcoin is a Ponzi scheme. In 2013, helpful resources 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 example of bitcoin the typical promises 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.