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In September 2021, the Chinese government declared all cryptocurrency transactions of any kind illegal, completing its crackdown on cryptocurrency. On 18 May 2021, China banned financial institutions and payment companies from being able to provide cryptocurrency transaction related services. 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 IMF has sought seeking a coordinated, consistent and comprehensive approach to supervising cryptocurrencies. 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. 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. 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. The FATF and financial regulators were informed as the data model was developed.
Significant market price rallies across multiple altcoin markets are often referred to as an "altseason". A Polytechnic University of Catalonia thesis in 2021 used a broader description, including not only alternative versions of bitcoin but every cryptocurrency other than bitcoin. According to the Ethereum Founder, the upgrade would cut both Ethereum's energy use and carbon-dioxide emissions by 99.9%. This completed a crackdown on cryptocurrency that had previously banned the operation of intermediaries and miners within China. In September 2021, the government of China, the single largest market for cryptocurrency, declared all cryptocurrency transactions illegal. In August 2021, Cuba followed with Resolution 215 to recognize and regulate cryptocurrencies such as bitcoin. In August 2014, the UK announced its Treasury had commissioned a study of cryptocurrencies and what role, if any, they could play in the UK economy. Cryptocurrency has undergone several periods of growth and retraction, including several bubbles and market crashes, such as in 2011, 2013–2014/15, 2017–2018, and 2021–2023.
The criticisms include the lack of stability in their price, the high energy consumption, high and variable transactions costs, the poor security and fraud at cryptocurrency exchanges, vulnerability to debasement (from forking), and the influence of miners. 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. The executive order included all digital assets, but cryptocurrencies posed both the greatest security risks and potential economic benefits. Reuters reported that bitcoin and other cryptocurrencies are unregulated in many countries and their legal status is unclear, meaning there is no safety net and little recourse for lost funds. After the early innovation of bitcoin in 2008 and the early network effect gained by bitcoin, tokens, cryptocurrencies, and other digital assets that were not bitcoin became collectively known during the 2010s as alternative cryptocurrencies, or "altcoins".
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The Financial Action Task Force (FATF) has defined cryptocurrency-related services as "virtual asset service providers" (VASPs) and recommended that they be regulated with the same money laundering (AML) and know your customer (KYC) requirements as financial institutions. Reuters reported that the inherent volatility of crypto tokens makes them a poor fit for boards with a low risk appetite, potentially limiting their appeal beyond core industry players. In 2025, some publicly traded companies announced plans to raise capital to buy and hold bitcoin and other cryptocurrencies as treasury assets. Monthly cryptocurrency transfers under $10,000 to and from Africa reached $316 million in June 2020, according to Chainalysis data. Bitcoin's founder, Satoshi Nakamoto, supported the idea that cryptocurrencies go well with libertarianism. Four of the most popular cryptocurrency market databases are CoinMarketCap, CoinGecko, BraveNewCoin, and Cryptocompare. Compared to the blockchain, databases perform fast as there is no verification process.
In March 2021, South Korea implemented new legislation to strengthen their oversight of digital assets. The largest scam occurred in April 2021, where the two founders of an African-based cryptocurrency exchange called Africrypt, Raees Cajee and Ameer Cajee, disappeared with $3.8 billion worth of bitcoin. But it is being contemplated that the Indian Parliament will soon pass a specific law to either ban or regulate the cryptocurrency market in India. As of 17 January 2025, the European Securities and Markets Authority (ESMA) issued guidance to crypto-asset service providers (CASPs) allowing them to maintain crypto-asset services for non-compliant ARTs and EMTs until the end of March 2025. The proposed legislation was criticised by Cook Islands Crown Law's deputy solicitor general David Greig, who described it as "flawed" and said that some provisions were "clearly unconstitutional".
For example, over one week in May 2022, bitcoin lost 20% of its value and Ethereum lost 26%, while Solana and Cardano lost 41% and 35% respectively. Cryptocurrency prices are much more volatile than established financial assets such as stocks. The total cryptocurrency market cap has historically been dominated by bitcoin accounting for at least 50% of the market cap value where altcoins have increased and decreased in market cap value in relation to bitcoin. The market capitalization of a cryptocurrency is calculated by multiplying the price by the number of coins in circulation. In an ICO campaign, a percentage of the cryptocurrency (usually in the form of "tokens") is sold to early backers of the project in exchange for legal tender or other cryptocurrencies, often bitcoin or Ether. The kiosk installed in Austin, Texas, is similar to bank ATMs but has scanners to read government-issued identification such as a driver's license, or a passport to confirm users' identities. As a result, as of 2020, it was possible to arbitrage to find the difference in price across several markets.
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Some agencies stopped accepting bitcoin and others turned to "greener" cryptocurrencies. It covers studies of cryptocurrencies and related technologies, and is published by the University of Pittsburgh. The research concluded that PoS networks consumed 0.001% the electricity of the bitcoin network. This makes it the most energy-intensive bitcoin mining operation in the United States. Bitcoin is the least energy-efficient cryptocurrency, using 707.6 kilowatt-hours of electricity per transaction. By November 2018, bitcoin was estimated to have an annual energy consumption of 45.8TWh, generating 22.0 to 22.9 million tons of CO2, rivalling nations like Jordan and Sri Lanka. Proof-of-work blockchains such as bitcoin, Ethereum, Litecoin, and Monero were estimated to have added between 3 million and 15 million tons of carbon dioxide (CO2) to the atmosphere in the period from 1 January 2016 to 30 June 2017. Mining for proof-of-work (PoW) cryptocurrencies requires enormous amounts of electricity and consequently comes with a large carbon footprint due to causing greenhouse gas emissions.
{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. In 2014, Gareth Murphy, a senior banking officer, suggested that the widespread adoption of cryptocurrencies may lead to too much money being obfuscated, blinding economists who would use such information to better steer the economy. Many banks do not offer virtual currency services themselves and can refuse to do business with virtual currency companies. The Bank for International Settlements summarized several criticisms of cryptocurrencies in Chapter V of their 2018 annual report. 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.}