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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 dealers was reported in May 2018. The U.S. Justice Department launched an investigation into possible price manipulation, including the techniques of spoofing and scrub transactions.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. national investigation was motivated 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 the exchanges refused to provide it and afterwards provided only limited data.

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 cost manipulation happened 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 in the Bitfinex exchange account for about half of the purchase 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 kind 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

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 cost, the high energy consumption, high and variable transactions costs, the bad security and fraud in cryptocurrency exchanges, vulnerability to debasement (from forking), and also the influence of miners.191192193.

The Economist wrote in 2015 these criticisms are unfair, predominantly since the unethical image may induce users to forget the capacities of their blockchain technology, but also due to 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 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 if all miners utilized modern facilities, the combined electricity consumption would be 166.7 megawatts (1.46 terawatt-hours annually ).133

At the end of 2017, the worldwide 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 percent of the total power consumed by the international banking industry, look here and even if bitcoin's consumption levels increased 100 fold from the current degrees, bitcoin's consumption would still only amount to approximately 2% of global electricity consumption.206.

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To reduce the costs, bitcoin miners have set up in areas like Iceland where renewable energy is cheap 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 prices.206208209210 Miners are attracted to providers such as 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.

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 by the World Bank concluded that bitcoin was not a deliberate Ponzi scheme.219:7 The Swiss Federal Council220:21 examined the concerns that bitcoin might be a pyramid scheme; it concluded that,"Since in the case of bitcoin the normal guarantees of gains 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.