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A cryptocurrency (colloquially crypto) is a digital currency designed to work through a computer network that is not reliant on any central authority, such as a government or bank, to uphold or maintain it. However, a type of cryptocurrency called a stablecoin may rely upon government action or legislation to require that a stable value be upheld and maintained.Hartill, Robin. " Why you might one day use stablecoins in place of credit cards or bank accounts", Yahoo Finance (26 July 2025).
Individual coin ownership records are stored in a digital ledger or blockchain, which is a computerized database that uses a consensus mechanism to secure E-commerce records, control the creation of additional coins, and verify the transfer of coin ownership. The two most common consensus mechanisms are proof of work and proof of stake. Despite the name, which has come to describe many of the fungibility blockchain tokens that have been created, cryptocurrencies are not considered to be Currency in the traditional sense, and varying legal treatments have been applied to them in various jurisdictions, including classification as Commodity, securities, and currencies. Cryptocurrencies are generally viewed as a distinct asset class in practice.
The first cryptocurrency was bitcoin, which was first released as open-source software in 2009. As of June 2023, there were more than 25,000 other cryptocurrencies in the marketplace, of which more than 40 had a market capitalization exceeding $1 billion. As of April 2025, the cryptocurrency market capitalization was estimated at US$2.8 trillion.
In 1996, the National Security Agency published a paper entitled How to Make a Mint: The Cryptography of Anonymous Electronic Cash, describing a cryptocurrency system. The paper was first published in an MIT mailing list (October 1996) and later (April 1997) in The American Law Review.
In 1998, Wei Dai described "b-money," an anonymous, distributed electronic cash system. Shortly thereafter, Nick Szabo described bit gold. Like bitcoin and other cryptocurrencies that would follow it, bit gold (not to be confused with the later gold-based exchange BitGold) was described as an electronic currency system that required users to complete a proof of work function with solutions being cryptographically put together and published.
In January 2009, bitcoin was created by developer Satoshi Nakamoto. It used SHA-256, a cryptographic hash function, in its proof-of-work scheme. In April 2011, Namecoin was created as an attempt at forming a decentralized DNS. In October 2011, Litecoin was released, which used scrypt as its hash function instead of SHA-256. Peercoin, created in August 2012, used a hybrid of proof-of-work and proof-of-stake.
Cryptocurrency has undergone several periods of growth and retraction, including several Economic bubble and market crashes, such as in 2011, 2013–2014/15, 2017–2018, and 2021–2023.
In August 2014, the UK announced its HM Treasury had commissioned a study of cryptocurrencies and what role, if any, they could play in the UK economy. The study was also to report on whether regulation should be considered. Its final report was published in 2018, and it issued a consultation on cryptoassets and in January 2021.
In June 2021, El Salvador became the first country to accept bitcoin as legal tender, after the Legislative Assembly had voted 62–22 to pass a bill submitted by President Nayib Bukele classifying the cryptocurrency as such.
In August 2021, Cuba followed with Resolution 215 to recognize and regulate cryptocurrencies such as bitcoin.
In September 2021, the government of China, the single largest market for cryptocurrency, declared all cryptocurrency transactions illegal. This completed a crackdown on cryptocurrency that had previously banned the operation of intermediaries and miners within China.
In September 2022, the world's second largest cryptocurrency at that time, Ethereum, transitioned its consensus mechanism from proof-of-work (PoW) to proof-of-stake (PoS) in an upgrade process known as "the Merge". According to the Ethereum Founder, the upgrade would cut both Ethereum's energy use and carbon-dioxide emissions by 99.9%.
On 11 November 2022, FTX Trading Ltd., a cryptocurrency exchange, which also operated a crypto hedge fund, and had been valued at $18 billion, filed for bankruptcy. The financial impact of the collapse extended beyond the immediate FTX customer base, as reported, while, at a Reuters conference, financial industry executives said that "regulators must step in to protect crypto investors." Technology analyst Avivah Litan commented on the cryptocurrency ecosystem that "everything...needs to improve dramatically in terms of user experience, controls, safety, customer service."
An October 2024 survey from the Pew Research Center found that 63% of adults in the U.S. "have little to no confidence that current ways to invest in, trade or use cryptocurrencies are reliable and safe." The survey also reported that 17% of U.S. adults had directly interacted with cryptocurrency, which was statistically unchanged from 2021.
The word "cryptocurrency", in its modern sense, was added to the Oxford English Dictionary in September 2018, with its earliest usage noted as being on Twitter in September 2009; its diminutive, crypto, was entered in 2022. In March 2018 cryptocurrency was added to the Merriam-Webster Dictionary.
Altcoins often have underlying differences when compared to bitcoin. For example, Litecoin aims to process a block every 2.5 minutes, rather than bitcoin's 10 minutes which allows Litecoin to confirm transactions faster than bitcoin. Another example is Ethereum, which has smart contract functionality that allows decentralized applications to be run on its blockchain. Ethereum was the most used blockchain in 2020, according to Bloomberg News. In 2016, it had the largest "following" of any altcoin, according to the New York Times.
Significant market price rallies across multiple altcoin markets are often referred to as an "altseason".
The term "physical bitcoin" is used in the finance industry when investment funds that hold crypto purchased from crypto exchanges put their crypto holdings in a specialised bank called a "custodian".
These physical representations of cryptocurrency do not hold any value by themselves; these are only utilized for collectable purposes. For example, the first incarnation of the bitcoin Casascius, coins made of silver, brass or aluminum sometimes with gold plating, or Titan Bitcoin, which in silver or gold versions are sought after by .
Within a proof-of-work system such as bitcoin, the safety, integrity, and balance of are maintained by a community of mutually distrustful parties referred to as Bitcoin miners. Miners use their computers to help validate and timestamp transactions, adding them to the ledger in accordance with a particular timestamping scheme. In a proof-of-stake blockchain, transactions are validated by holders of the associated cryptocurrency, sometimes grouped together in stake pools.
Most cryptocurrencies are designed to gradually decrease the production of that currency, placing a cap on the total amount of that currency that will ever be in circulation." How Cryptocurrencies Could Upend Banks' Monetary Role". , American Banker. 26 May 2013 Compared with ordinary currencies held by financial institutions or kept as cash on hand, cryptocurrencies can be more difficult for seizure by law enforcement.
For use as a distributed ledger, a blockchain is typically managed by a peer-to-peer network collectively adhering to a protocol for validating new blocks. Once recorded, the data in any given block cannot be altered retroactively without the alteration of all subsequent blocks, which requires collusion of the network majority.
Blockchains are secure by design and are an example of a distributed computing system with high Byzantine fault tolerance. Decentralized consensus has therefore been achieved with a blockchain.
Node owners are either volunteers, those hosted by the organization or body developing the technology, or those incentivised by rewards from the node network.
The first timestamping scheme invented was the proof-of-work scheme. The most widely used proof-of-work schemes are based on SHA-256 and scrypt.
Some other hashing algorithms that are used for proof-of-work include CryptoNote, Blake, SHA-3, and X11.
Another method is called the proof-of-stake scheme. Proof-of-stake is a method of securing a cryptocurrency network and achieving distributed consensus through requesting users to show ownership of a certain amount of currency. It is different from proof-of-work systems that run difficult hashing algorithms to validate electronic transactions. The scheme is largely dependent on the coin, and there is currently no standard form of it. Some cryptocurrencies use a combined proof-of-work and proof-of-stake scheme.
With more people entering the world of virtual currency, generating hashes for validation has become more complex over time, forcing miners to invest increasingly large sums of money to improve computing performance. Consequently, the reward for finding a hash has diminished and often does not justify the investment in equipment and cooling facilities (to mitigate the heat the equipment produces) and the electricity required to run them.
Popular regions for mining include those with inexpensive electricity, a cold climate, and jurisdictions with clear and conducive regulations. By July 2019, bitcoin's electricity consumption was estimated to be approximately 7 gigawatts, around 0.2% of the global total, or equivalent to the energy consumed nationally by Switzerland.
Some Mining pool, sharing their processing power over a network to split the reward equally, according to the amount of work they contributed to the probability of finding a block. A "share" is awarded to members of the mining pool who present a valid partial proof-of-work.
, the Chinese government has halted trading of virtual currency, banned initial coin offerings, and shut down mining. Many Chinese miners have since relocated to Canada and Texas. One company is operating data centers for mining operations at Canadian oil and gas field sites due to low gas prices. In June 2018, Hydro Quebec proposed to the provincial government to allocate 500 megawatts of power to crypto companies for mining. According to a February 2018 report from Fortune, Iceland has become a haven for cryptocurrency miners in part because of its cheap electricity.
In March 2018, the city of Plattsburgh, New York put an 18-month moratorium on all cryptocurrency mining in an effort to preserve natural resources and the "character and direction" of the city. In 2021, Kazakhstan became the second-biggest crypto-currency mining country, producing 18.1% of the global exahash rate. The country built a compound containing 50,000 computers near Ekibastuz.
A GTX 1070 Ti, which was released at a price of $450, sold for as much as $1,100. Another popular card, the GTX 1060 (6 GB model), released at an MSRP of $250, sold for almost $500. RX 570 and RX 580 cards from AMD were out of stock for almost a year. Miners regularly buy up the entire stock of new GPUs as soon as they are available.
Nvidia has asked retailers to do what they can when it comes to selling GPUs to gamers instead of miners. Boris Böhles, PR manager for Nvidia in the German region, said: "Gamers come first for Nvidia."
There exist multiple methods of storing keys or seed in a wallet. These methods range from using paper wallets (which are public, private, or seed keys written on paper), to using hardware wallets (which are hardware to store your wallet information), to a digital wallet (which is a computer with software hosting your wallet information), to hosting your wallet using an exchange where cryptocurrency is traded, or by storing your wallet information on a digital medium such as plaintext.
Some cryptocurrencies, such as Monero, Zerocoin, Zerocash, and CryptoNote, implement additional measures to increase privacy, such as by using zero-knowledge proofs.
A recent 2020 study presented different attacks on privacy in cryptocurrencies. The attacks demonstrated how the anonymity techniques are not sufficient safeguards. In order to improve privacy, researchers suggested several different ideas, including new cryptographic schemes and mechanisms for hiding the IP address of the source.
The rewards paid to miners increase the supply of the cryptocurrency. By making sure that verifying transactions is a costly business, the integrity of the network can be preserved as long as benevolent nodes control a majority of computing power. The verification algorithm requires a lot of processing power, and thus electricity, in order to make verification costly enough to accurately validate the public blockchain. Miners have to factor in the costs associated with expensive equipment necessary to stand a chance of solving a hash problem, and consider the significant amount of electrical power in search of the solution. Generally, the block rewards outweigh electricity and equipment costs, but this may not always be the case.
The current value, not the long-term value, of the cryptocurrency supports the reward scheme to incentivize miners to engage in costly mining activities. (2020). 9783959773034 ISBN 9783959773034 In 2018, bitcoin's design caused a 1.4% welfare loss compared to an efficient cash system, while a cash system with 2% money growth has a minor 0.003% welfare cost. The main source for this inefficiency is the large mining cost, which is estimated to be US$360 million per year. This translates into users being willing to accept a cash system with an inflation rate of 230% before being better off using bitcoin as a means of payment. However, the efficiency of the bitcoin system can be significantly improved by optimizing the rate of coin creation and minimizing transaction fees. Another potential improvement is to eliminate inefficient mining activities by changing the consensus protocol altogether.
Select cryptocurrency exchanges have offered to let the user choose between different presets of transaction fee values during the currency conversion. One of those exchanges, namely LiteBit, previously headquartered in the Netherlands, was forced to cease all operations in August 2023, "due to market changes and regulatory pressure".
The "recommended fee" suggested by the network will often depend on the time of day (due to depending on network load).
For Ethereum, transaction fees differ by computational complexity, bandwidth use, and storage needs, while bitcoin transaction fees differ by transaction size and whether the transaction uses SegWit. In February 2023, the median transaction fee for Ether corresponded to $2.2845, while for bitcoin it corresponded to $0.659.
Some cryptocurrencies have no transaction fees, the most well-known example being Nano (XNO), and instead rely on client-side proof-of-work as the transaction prioritization and anti-spam mechanism.
Crypto marketplaces do not guarantee that an investor is completing a purchase or trade at the optimal price. As a result, as of 2020, it was possible to arbitrage to find the difference in price across several markets.
According to PricewaterhouseCoopers, four of the 10 biggest proposed initial coin offerings have used Switzerland as a base, where they are frequently registered as non-profit foundations. The Swiss regulatory agency FINMA stated that it would take a "balanced approach" to ICO projects and would allow "legitimate innovators to navigate the regulatory landscape and so launch their projects in a way consistent with national laws protecting investors and the integrity of the financial system." In response to numerous requests by industry representatives, a legislative ICO working group began to issue legal guidelines in 2018, which are intended to remove uncertainty from cryptocurrency offerings and to establish sustainable business practices.
The cryptocurrency market cap follows a trend known as the "halving", which is when the block rewards received from bitcoin are halved due to technological mandated limited factors instilled into bitcoin which in turn limits the supply of bitcoin. As the date reaches near of a halving (twice thus far historically) the cryptocurrency market cap increases, followed by a downtrend.
By June 2021, cryptocurrency had begun to be offered by some wealth managers in the US for 401(k)s.
In the longer term, of the 10 leading cryptocurrencies identified by the total value of coins in circulation in January 2018, only four (bitcoin, Ethereum, Cardano and Ripple (XRP)) were still in that position in early 2022. The total value of all cryptocurrencies was $2 trillion at the end of 2021, but had halved nine months later. The Wall Street Journal has commented that the crypto sector has become "intertwined" with the rest of the capital markets and "sensitive to the same forces that drive tech stocks and other risk assets," such as inflation forecasts.
David Golumbia says that the ideas influencing bitcoin advocates emerge from right-wing extremist movements such as the Liberty Lobby and the John Birch Society and their anti-Central Bank rhetoric, or, more recently, Ron Paul and Tea Party-style libertarianism. Steve Bannon, who owns a "good stake" in bitcoin, sees cryptocurrency as a form of disruptive populism, taking control back from central authorities.
Bitcoin's founder, Satoshi Nakamoto, supported the idea that cryptocurrencies go well with libertarianism. "It's very attractive to the libertarian viewpoint if we can explain it properly," Nakamoto said in 2008.
According to the European Central Bank, the decentralization of money offered by bitcoin has its theoretical roots in the Austrian school of economics, especially with Friedrich von Hayek in his book ,Friedrich A. von (Friedrich August) Hayek (1990). 9780255362399, London : Institute of Economic Affairs. . ISBN 9780255362399 in which Hayek advocates a complete free market in the production, distribution and management of money to end the monopoly of central banks.
Some migrants in the United Arab Emirates used cryptocurrencies to send remittances home, claiming lower fees compared with traditional remittance services.
In May 2020, the Joint Working Group on interVASP Messaging Standards published "IVMS 101", a universal common language for communication of required originator and beneficiary information between VASPs. The FATF and financial regulators were informed as the data model was developed.
In June 2020, FATF updated its guidance to include the "Travel Rule" for cryptocurrencies, a measure which mandates that VASPs obtain, hold, and exchange information about the originators and beneficiaries of virtual asset transfers. Subsequent standardized protocol specifications recommended using JSON for relaying data between VASPs and identity services. As of December 2020, the IVMS 101 data model has yet to be finalized and ratified by the three global standard setting bodies that created it.
The European Commission published a digital finance strategy in September 2020. This included a draft regulation on Markets in Crypto-Assets (MiCA), which aimed to provide a comprehensive regulatory framework for digital assets in the EU.
In June 2021, the Basel Committee on Banking Supervision proposed that banks that held cryptocurrency assets must set aside capital to cover all potential losses. For instance, if a bank were to hold bitcoin worth $2 billion, it would be required to set aside enough capital to cover the entire $2 billion. This is a more extreme standard than banks are usually held to when it comes to other assets. However, this is a proposal and not a regulation.
The IMF has sought seeking a coordinated, consistent and comprehensive approach to supervising cryptocurrencies. Tobias Adrian, the IMF's financial counsellor and head of its monetary and capital markets department said in a January 2022 interview that "Agreeing global regulations is never quick. But if we start now, we can achieve the goal of maintaining financial stability while also enjoying the benefits which the underlying technological innovations bring,"
In May 2024, 15 years after the advent of the first blockchain, bitcoin, the US Congress advanced a bill to the full House of Representatives to provide regulatory clarity for digital assets. The Financial Innovation and Technology for the 21st Century Act, which defines responsibilities between various US agencies, notably between the Commodity Futures Trading Commission (CFTC) for decentralized blockchains and the Securities and Exchange Commission (SEC) for blockchains that are functional but not decentralized. are excluded from both CFTC and SEC regulation in this bill, "except for fraud and certain activities by registered firms."
On 18 May 2021, China banned financial institutions and payment companies from being able to provide cryptocurrency transaction related services. This led to a sharp fall in the price of the biggest proof of work cryptocurrencies. For instance, bitcoin fell 31%, Ethereum fell 44%, Binance Coin fell 32% and Dogecoin fell 30%. Proof of work mining was the next focus, with regulators in popular mining regions citing the use of electricity generated from highly polluting sources such as coal to create bitcoin and Ethereum.
In September 2021, the Chinese government declared all cryptocurrency transactions of any kind illegal, completing its crackdown on cryptocurrency.
Similar criticism was echoed by Auckland University of Technology cryptocurrency specialist and senior lecturer Jeff Nijsse and University of Otago political scientist Professor Robert Patman, who described it as government overreach and described it as inconsistent with international law. Since the Cook Islands is an associated state that is part of the Realm of New Zealand, Patman said that the law would have "implications for New Zealand's governance arrangements." A spokesperson for New Zealand Foreign Minister Winston Peters confirmed that New Zealand officials were discussing the legislation with their Cook Islands counterparts. Cook Islands Prime Minister Mark Brown defended the legislation as part of the territory's fight against international cybercrime.
The rest of MiCA came into force as of 30 December 2024, covering crypto-assets other than ART and EMT and CASPs. MiCA excludes crypto-assets if they qualify as financial instruments according to ESMA guidelines published on 17 December 2024 as well as crypto-assets that are unique and not fungible with other crypto-assets.
Expressing his public policy opinion on the Indian cryptocurrency market to a well-known online publication, a leading public policy lawyer and Vice President of SAARCLAW (South Asian Association for Regional Co-operation in Law) Hemant Batra has said that the "cryptocurrency market has now become very big with involvement of billions of dollars in the market hence, it is now unattainable and irreconcilable for the government to completely ban all sorts of cryptocurrency and its trading and investment". He mooted regulating the cryptocurrency market rather than completely banning it. He favoured following IMF and FATF guidelines in this regard.
In November 2024, the incoming Labour government confirmed that it will proceed with the regulation of cryptoassets and new UK requirements are expected to come into force in 2026.
On 19 October 2021, the first bitcoin-linked exchange-traded fund (ETF) from ProShares started trading on the NYSE under the ticker "BITO." ProShares CEO Michael L. Sapir said the ETF would expose bitcoin to a wider range of investors without the hassle of setting up accounts with cryptocurrency providers. Ian Balina, the CEO of Token Metrics, stated that SEC approval of the ETF was a significant endorsement for the crypto industry because many regulators globally were not in favor of crypto, and retail investors were hesitant to accept crypto. This event would eventually open more opportunities for new capital and new people in this space.
The Department of the Treasury, on 20 May 2021, announced that it would require any transfer worth $10,000 or more to be reported to the Internal Revenue Service since cryptocurrency already posed a problem where illegal activity like tax evasion was facilitated broadly. This release from the IRS was a part of efforts to promote better compliance and consider more severe penalties for tax evaders.
On 17 February 2022, the Department of Justice named Eun Young Choi as the first director of a National Cryptocurrency Enforcement Team to help identify and deal with misuse of cryptocurrencies and other digital assets.
The Biden administration faced a dilemma as it tried to develop regulations for the cryptocurrency industry. On one hand, officials were hesitant to restrict a growing industry. On the other hand, they were committed to preventing illegal cryptocurrency transactions. To reconcile these conflicting goals, on 9 March 2022, Biden issued an executive order. Followed this, on 16 September 2022, the Comprehensive Framework for Responsible Development of Digital Assets document was released to support development of cryptocurrencies and restrict their illegal use. The executive order included all digital assets, but cryptocurrencies posed both the greatest security risks and potential economic benefits. Though this might not address all of the challenges in crypto industry, it was a significant milestone in the US cryptocurrency regulation history.
In February 2023, the SEC ruled that cryptocurrency exchange Kraken's estimated $42 billion in staked assets globally operated as an illegal securities seller. The company agreed to a $30 million settlement with the SEC and to cease selling its staking service in the US. The case would impact other major crypto exchanges operating staking programs.
On 23 March 2023, the SEC issued an alert to investors stating that firms offering crypto asset securities might not be complying with US laws. The SEC argued that unregistered offerings of crypto asset securities might not include important information.
On 23 January 2025, President Donald Trump signed Executive Order 14178, Strengthening American Leadership in Digital Financial Technology revoking Executive Order 14067 of 9 March 2022, Ensuring Responsible Development of Digital Assets and the Department of the Treasury's Framework for International Engagement on Digital Assets of 7 July 2022. In addition the order prohibits the establishment, issuance or promotion of Central bank digital currency and establishes a group tasked with proposing a federal regulatory framework for digital assets within 180 days.
According to the Library of Congress in 2021, an "absolute ban" on trading or using cryptocurrencies applies in 9 countries: Algeria, Bangladesh, Bolivia, China, Egypt, Iraq, Morocco, Nepal, and the United Arab Emirates. An "implicit ban" applies in another 39 countries or regions, which include: Bahrain, Benin, Burkina Faso, Burundi, Cameroon, Chad, Cote d'Ivoire, the Dominican Republic, Ecuador, Gabon, Georgia, Guyana, Indonesia, Iran, Jordan, Kazakhstan, Kuwait, Lebanon, Lesotho, Macau, Maldives, Mali, Moldova, Namibia, Niger, Nigeria, Oman, Pakistan, Palau, Republic of Congo, Saudi Arabia, Senegal, Tajikistan, Tanzania, Togo, Turkey, Turkmenistan, Qatar and Vietnam.
In the United States and Canada, state and provincial securities regulators, coordinated through the North American Securities Administrators Association, are investigating "Bitcoin scams" and ICOs in 40 jurisdictions.
Various government agencies, departments, and courts have classified bitcoin differently. China Central Bank banned the handling of bitcoins by financial institutions in China in early 2014.
In Russia, though owning cryptocurrency is legal, its residents are only allowed to purchase goods from other residents using the Russian ruble while nonresidents are allowed to use foreign currency. Bitcoin's Legality Around The World , Forbes, 31 January 2014 Regulations and bans that apply to bitcoin probably extend to similar cryptocurrency systems.
In August 2018, the Bank of Thailand announced its plans to create its own cryptocurrency, the Central Bank Digital Currency (CBDC).
Cryptocurrency networks display a lack of regulation that has been criticized as enabling criminals who seek to evade taxes and Money laundering. Money laundering issues FinCEN Files, however with bank-to-bank wire transfers for instance, the account holder must provide a proven identity.
Transactions that occur through the use and exchange of these cryptocurrencies are independent from formal banking systems, and therefore can make tax evasion simpler for individuals. Since charting taxable income is based upon what a recipient reports to the revenue service, it becomes extremely difficult to account for transactions made using cryptocurrencies, a mode of exchange that is complex and difficult to track.
Systems of anonymity that most cryptocurrencies offer can also serve as a means to launder money. Rather than laundering money through an intricate network of financial actors and offshore bank accounts, laundering money through cryptocurrencies can be achieved through anonymous transactions.
Cryptocurrency makes legal enforcement against extremist groups more complicated, which consequently strengthens them. White supremacist Richard Spencer declared bitcoin the "currency of the alt-right".
On 21 November 2017, Tether announced that it had been hacked, losing $31 million in USDT from its core treasury wallet.
On 7 December 2017, Slovenian cryptocurrency exchange NiceHash reported that hackers had stolen over $70 million using a hijacked company computer.
On 19 December 2017, Yapian, the owner of South Korean exchange Youbit, filed for bankruptcy after suffering two hacks that year. Customers were still granted access to 75% of their assets.
In May 2018, Bitcoin Gold had its transactions hijacked and abused by unknown hackers. Exchanges lost an estimated $18m and bitcoin Gold was delisted from Bittrex after it refused to pay its share of the damages.
On 13 September 2018, Homero Josh Garza was sentenced to 21 months of imprisonment, followed by three years of supervised release. Garza had founded the cryptocurrency startups GAW Miners and ZenMiner in 2014, acknowledged in a plea agreement that the companies were part of a pyramid scheme, and pleaded guilty to wire fraud in 2015. The SEC separately brought a civil enforcement action in the US against Garza, who was eventually ordered to pay a judgment of $9.1 million plus $700,000 in interest. The SEC's complaint stated that Garza, through his companies, had fraudulently sold "investment contracts representing shares in the profits they claimed would be generated" from mining.Cyris Farivar, GAW Miners founder owes nearly $10 million to SEC over Bitcoin fraud , Ars Technica (5 October 2017).
In January 2018, Japanese exchange Coincheck reported that hackers had stolen cryptocurrency worth $530 million.
In June 2018, South Korean exchange Coinrail was hacked, losing over $37 million in crypto. The hack worsened a cryptocurrency selloff by an additional $42 billion.
On 9 July 2018, the exchange Bancor, whose code and fundraising had been subjects of controversy, had $23.5 million in crypto stolen.
A 2020 EU report found that users had lost crypto-assets worth hundreds of millions of US dollars in security breaches at exchanges and storage providers. Between 2011 and 2019, reported breaches ranged from four to twelve a year. In 2019, more than a billion dollars' worth of cryptoassets was reported stolen. Stolen assets "typically find their way to illegal markets and are used to fund further criminal activity".
According to a 2020 report produced by the United States Attorney General's Cyber-Digital Task Force, three categories make up the majority of illicit cryptocurrency uses: "(1) financial transactions associated with the commission of crimes; (2) money laundering and the Tax evasion, reporting, or other legal requirements; or (3) crimes, such as theft, directly implicating the cryptocurrency marketplace itself." The report concluded that "for cryptocurrency to realize its truly transformative potential, it is imperative that these risks be addressed" and that "the government has legal and regulatory tools available at its disposal to confront the threats posed by cryptocurrency's illicit uses".
According to the UK 2020 national risk assessment—a comprehensive assessment of money laundering and terrorist financing risk in the UK—the risk of using cryptoassets such as bitcoin for money laundering and terrorism financing is assessed as "medium" (from "low" in the previous 2017 report). Legal scholars suggested that the money laundering opportunities may be more perceived than real. Blockchain analysis company Chainalysis concluded that illicit activities like cybercrime, money laundering and terrorism financing made up only 0.15% of all crypto transactions conducted in 2021, representing a total of $14 billion.
In December 2021, Monkey Kingdom, a NFT project based in Hong Kong, lost US$1.3 million worth of cryptocurrencies via a phishing link used by the hacker.
On 2 November 2023, Sam Bankman-Fried was pronounced guilty on seven counts of fraud related to FTX. Federal criminal court sentencing experts speculated on the potential amount of prison time likely to be meted out. On 28 March 2024, the court sentenced Bankman-Fried to 25 years in prison.
According to Bloomberg and the New York Times, Federation Tower, a complex in the heart of Moscow, is home to many cryptocurrency businesses under suspicion of facilitating extensive money laundering, including accepting illicit cryptocurrency funds obtained through scams, , and ransomware. Notable businesses include Garantex, Eggchange, Cashbank, Buy-Bitcoin, Tetchange, Bitzlato, and Suex, which was sanctioned by the U.S. in 2021. Bitzlato founder and owner Anatoly Legkodymov was arrested following money-laundering charges by the United States Department of Justice.
Dark money has also been flowing into Russia through a dark web marketplace called Hydra, which is powered by cryptocurrency, and enjoyed more than $1 billion in sales in 2020, according to Chainalysis. The platform demands that sellers liquidate cryptocurrency only through certain regional exchanges, which has made it difficult for investigators to trace the money.
Almost 74% of ransomware revenue in 2021 — over $400 million worth of cryptocurrency — went to software strains likely affiliated with Russia, where oversight is notoriously limited. However, Russians are also leaders in the benign adoption of cryptocurrencies, as the ruble is unreliable, and Vladimir Putin favours the idea of "overcoming the excessive domination of the limited number of reserve currencies."
In 2022, RenBridge—an unregulated alternative to exchanges for transferring value between blockchains—was found to be responsible for the laundering of at least $540 million since 2020. It is especially popular with people attempting to launder money from theft. This includes a cyberattack on Japanese crypto exchange Liquid that has been linked to North Korea.
Darknet markets present challenges in regard to their legality. Cryptocurrency used in dark markets are not clearly or legally classified in almost all parts of the world. In the US, bitcoins are regarded as "virtual assets". This type of ambiguous classification puts pressure on law enforcement agencies around the world to adapt to the shifting drug trade of dark markets.
In April 2022, the computer programmer Virgil Griffith received a five-year prison sentence in the US for attending a Pyongyang cryptocurrency conference, where he gave a presentation on blockchains which might be used for sanctions evasion.
Regulators in several countries have warned against cryptocurrency and some have taken measures to dissuade users. However, research in 2021 by the UK's financial regulator suggests such warnings either went unheard, or were ignored. Fewer than one in 10 potential cryptocurrency buyers were aware of consumer warnings on the Financial Conduct Authority (FCA) website, and 12% of crypto users were not aware that their holdings were not protected by statutory compensation. Of 1,000 respondents between the ages of eighteen and forty, 70% wrongly assumed cryptocurrencies were regulated, 75% of younger crypto investors claimed to be driven by competition with friends and family, and 58% said that social media enticed them to make high risk investments. The FCA recommends making use of its warning list, which flags unauthorized financial firms.
Many banks do not offer virtual currency services themselves and can refuse to do business with virtual currency companies. In 2014, Gareth Murphy, a senior banking officer, suggested that the widespread adoption of cryptocurrencies may lead to too much money being Obfuscation, blinding economists who would use such information to better steer the economy. While traditional financial products have strong consumer protections in place, there is no intermediary with the power to limit consumer losses if bitcoins are lost or stolen. One of the features cryptocurrency lacks in comparison to credit cards, for example, is consumer protection against fraud, such as .
The French regulator Autorité des marchés financiers (AMF) lists 16 websites of companies that solicit investment in cryptocurrency without being authorized to do so in France.
An October 2021 paper by the National Bureau of Economic Research found that bitcoin suffers from systemic risk as the top 10,000 addresses control about one-third of all bitcoin in circulation. It is even worse for miners, with 0.01% controlling 50% of the capacity. According to researcher Flipside Crypto, less than 2% of anonymous accounts control 95% of all available bitcoin supply. This is considered risky as a great deal of the market is in the hands of a few entities.
A paper by John Griffin, a finance professor at the University of Texas, and Amin Shams, a graduate student, found that in 2017 the price of bitcoin had been substantially inflated using another cryptocurrency, Tether.
Roger Lowenstein, author of " Bank of America: The Epic Struggle to Create the Federal Reserve," said in a 2022 New York Times story that FTX currency exchange will face over $8 billion in claims.
As the first big Wall Street bank to embrace cryptocurrencies, Morgan Stanley announced on 17 March 2021 that they will be offering access to bitcoin funds for their wealthy clients through three funds which enable bitcoin ownership for investors with an aggressive risk tolerance. BNY Mellon on 11 February 2021 announced that it would begin offering cryptocurrency services to its clients.
On 20 April 2021, Venmo added support to its platform to enable customers to buy, hold and sell cryptocurrencies.
In October 2021, financial services company Mastercard announced it is working with digital asset manager Bakkt on a platform that would allow any bank or merchant on the Mastercard network to offer cryptocurrency services.
Critics have also identified a large electronic waste problem in disposing of Bitcoin mining. Mining hardware is improving at a fast rate, quickly resulting in older generations of hardware.
Bitcoin is the least energy-efficient cryptocurrency, using 707.6 kilowatt-hours of electricity per transaction.
Before June 2021, China was the primary location for bitcoin mining. However, due to concerns over power usage and other factors, China forced out bitcoin operations, at least temporarily. As a result, the United States promptly emerged as the top global leader in the industry. An example of a gross amount of electronic waste associated with bitcoin mining operations in the US is a facility located in Dalton, Georgia which is consuming nearly the same amount of electricity as the combined power usage of 97,000 households in its vicinity. Another example is that Riot Platforms operates a bitcoin mining facility in Rockdale, Texas, which consumes approximately as much electricity as the nearby 300,000 households. This makes it the most energy-intensive bitcoin mining operation in the United States.
The world's second-largest cryptocurrency, Ethereum, uses 62.56 kilowatt-hours of electricity per transaction. XRP is the world's most energy efficient cryptocurrency, using 0.0079 kilowatt-hours of electricity per transaction.
Although the biggest PoW blockchains consume energy on the scale of medium-sized countries, the annual power demand from proof-of-stake (PoS) blockchains is on a scale equivalent to a housing estate. The Times identified six "environmentally friendly" cryptocurrencies: Bitgreen, Cardano, Chia, IOTA, Nano, and Solarcoin. Academics and researchers have used various methods for estimating the energy use and energy efficiency of blockchains. A study of the six largest PoS networks in May 2021 concluded:
In terms of annual consumption (kWh/year), the figures were: Polkadot (70,237), Tezos (113,249), Avalanche (489,311), Algorand (512,671), Cardano (598,755) and Solana (1,967,930). This equates to Polkadot consuming 7 times the electricity of an average U.S. home, Cardano 57 homes and Solana 200 times as much. The research concluded that PoS networks consumed 0.001% the electricity of the bitcoin network. University College London researchers reached a similar conclusion.
Variable renewable energy power stations could invest in bitcoin mining to reduce curtailment, hedge electricity price risk, stabilize the grid, increase the profitability of renewable energy power stations and therefore accelerate transition to sustainable energy.
The journal encourages authors to digitally sign a Hash function of submitted papers, which will then be timestamped into the bitcoin blockchain. Authors are also asked to include a personal bitcoin address in the first page of their papers.
However, in 2021, there was a backlash against donations in bitcoin because of the environmental emissions it caused. Some agencies stopped accepting bitcoin and others turned to "greener" cryptocurrencies. The Greenpeace USA stopped accepting bitcoin donations after seven years. It said: "As the amount of energy needed to run bitcoin became clearer, this policy became no longer tenable."
In 2022, the Ukrainian government raised over worth of aid through cryptocurrency following the 2022 Russian invasion of Ukraine.
Investors Warren Buffett and George Soros have respectively characterized it in 2014–2018 as a "mirage" and a "bubble". Business executives Jack Ma and JP Morgan Chase CEO Jamie Dimon have called it in 2017–2018 a "bubble" and a "fraud", respectively, although Jamie Dimon later said in 2018 that he regretted stating bitcoin was a fraud. BlackRock CEO Laurence D. Fink in 2017 called bitcoin an "index of money laundering".
In June 2022, business magnate Bill Gates said that cryptocurrencies are "100% based on greater fool theory".
Legal scholars criticize the lack of regulation, which hinders conflict resolution when crypto assets are at the center of a legal dispute, for example a divorce or an inheritance. In Switzerland, jurists generally deny that cryptocurrencies are objects that fall under property law, as cryptocurrencies do not belong to any class of legally defined objects ( Typenzwang, the legal numerus clausus). Therefore, it is debated whether anybody could even be sued for embezzlement of cryptocurrency if they had access to someone's wallet. However, in the law of obligations and Contract, any kind of object would be legally valid, but the object would have to be tied to an identified counterparty. However, inasmuch the more popular cryptocurrencies can be freely and quickly exchanged into legal tender, they are financial assets and have to be taxed and accounted for as such.
Losses associated with cryptocurrency investments have been linked to suicides. In 2018, an increase in crypto-related suicides was noticed after the cryptocurrency market crashed in August. The situation was particularly critical in Korea as crypto traders were on "suicide watch". The May 2022 collapse of the Luna currency operated by Terra also led to reports of suicidal investors in crypto-related subreddits.
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