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Title: Cryptocurrency  
Author: World Heritage Encyclopedia
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Subject: Bitcoin, Auroracoin, Nxt, Ethereum, Cryptocurrencies
Collection: Cryptocurrencies, Decentralization, Financial Technology
Publisher: World Heritage Encyclopedia


A cryptocurrency (or crypto currency) is a medium of exchange using cryptography to secure the transactions and to control the creation of new units.[1] Cryptocurrencies are a subset of alternative currencies or specifically of digital currencies. The first decentralized cryptocurrency to be created was bitcoin in 2009. Since then, numerous cryptocurrencies have been created. A feature that is typical in cryptocurrency is decentralized control, distinct from a centralized electronic money system such as PayPal. Another common feature is that transactions are publicly recorded in a ledger. An example is bitcoin, where all transactions are recorded in the block chain.


  • Overview 1
  • History 2
    • Publicity 2.1
  • Legality 3
    • Arrests 3.1
    • Fraud 3.2
  • Timestamping 4
    • Proof-of-work schemes 4.1
    • Proof-of-stake and combined schemes 4.2
  • List of cryptocurrencies 5
    • Notes 5.1
  • Criticism 6
  • See also 7
  • References 8


Cryptocurrency is produced by the entire cryptocurrency system collectively, at a rate which is prior defined and publicly known. In centralized banking and economic systems such as the Federal Reserve System, governments control the supply of currency by printing units of fiat money or demanding additions to digital banking ledgers. However, governments cannot produce units of cryptocurrency and as such, governments cannot provide backing for firms, banks or corporate entities which hold asset value measured in a decentralized cryptocurrency. The underlying technical system upon which all cryptocurrencies are now based was created by the group or individual known as Satoshi Nakamoto.[2][3][4]

Hundreds of cryptocurrency specifications now exist; most are similar to and derived from the first fully implemented decentralized cryptocurrency, bitcoin.[5][6] Within cryptocurrency systems the safety, integrity and balance of ledgers is maintained by a community of mutually distrustful parties referred to as miners: members of the general public using their computers to help validate and timestamp transactions adding them to the ledger in accordance with a particular timestamping scheme.[7]

The security of cryptocurrency ledgers is based on the assumption that the majority of miners are honestly trying to maintain the ledger.

Most cryptocurrencies are designed to gradually decrease production of currency, placing an ultimate cap on the total amount of currency that will ever be in circulation. This can mimic the scarcity (and value) of precious metals and avoid hyperinflation.[1][8] Compared with ordinary currencies held by financial institutions or kept as cash on hand, cryptocurrencies are less susceptible to seizure by law enforcement.[1][9] Existing cryptocurrencies are all pseudo-anonymous, though additions such as Zerocoin and its distributed laundry[10] feature have been suggested, which would allow for anonymity.[11][12][13]


The first decentralized cryptocurrency, bitcoin, was created in 2009 by pseudonymous developer Satoshi Nakamoto. It used SHA-256, a cryptographic hash function, as its proof-of-work scheme.[14][15][16] In April 2011, Namecoin was created as an attempt at forming a decentralized DNS, which would make internet censorship very difficult. Soon after, in October 2011, Litecoin was released. It was the first successful cryptocurrency to use scrypt as its hash function instead of SHA-256. Another notable cryptocurrency, Peercoin was the first to use a proof-of-work/proof-of-stake hybrid.[17] Many other cryptocurrencies have been created though few have been successful, as they have brought little in the way of technical innovation. On 6 August 2014, the UK announced its Treasury had been commissioned to do a study of cryptocurrencies, and what role, if any, they can play in the UK economy. The study was also to report on whether regulation should be considered.[18]


Central bank representatives have stated that the adoption of cryptocurrencies such as bitcoin pose a significant challenge to central banks' ability to influence the price of credit for the whole economy, they've also stated that as trade using cryptocurrencies become more popular, there is bound to be a loss of consumer confidence in fiat currencies. Gareth Murphy, a senior central banking officer has stated "widespread use [of cryptocurrency] would also make it more difficult for statistical agencies to gather data on economic activity, which are used by governments to steer the economy". He cautioned that virtual currencies pose a new challenge to central banks' control over the important functions of monetary and exchange rate policy.[19]

Jordan Kelley, founder of Robocoin launched the first bitcoin ATM in the United States on February 20, 2014. 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.[20]

The Jamaican bobsled team's trip to the 2014 Olympic games in Sochi, Russia.[21] The growing community around Dogecoin is looking to cement its charitable credentials by raising funds to sponsor service dogs for children with special needs.[22]


Cryptocurrencies are legal in all countries except Iceland, due primarily to Iceland's freeze on foreign exchange.[23] Controversy over the misuse of cryptocurrency has also led to restrictions in certain countries – regulators in China banned the handling of bitcoins by financial institutions during an extremely fast adoption period in early 2014.[24] In Russia, though cryptocurrencies are perfectly legal, it is illegal to actually purchase goods with any currency other than the Russian ruble.[25]

On March 25, 2014 the IRS ruled that bitcoin will be treated as property for tax purposes as opposed to currency. This means bitcoin will be subject to capital gains tax. One benefit of this ruling is that it clarifies the legality of bitcoin. No longer do investors need to worry that investments in or profit made from bitcoins are illegal or how to report them to the IRS.[26]

Some cryptocurrency have legal issues such as Coinye, an altcoin that used, without permission, rapper Kanye West as its logo. This altcoin has been compared to the popular Dogecoin. Upon hearing of the release of Coinye, originally called Coinye West, attorneys for Kanye West sent a cease and desist letter to the email operator of Coinye, whose name remains unknown. The letter stated that Coinye was willful trademark infringement, unfair competition, cyberpiracy, and dilution and instructed Coinye to stop using the likeness and name of Kanye West.[27]


There have been very few arrests in the United States related to cryptocurrency. This is primarily due to the difficulty of tracking cryptocurrency payments. The arrests that have been made are all on charges of using cryptocurrency to launder money. The most notable case was the arrest of Charlie Shrem, the CEO of BitInstant, a bitcoin exchange backed by the Winklevoss twins.[28]

In Florida, a user was charged with felony violations of Florida’s law against unlicensed money transmitters for transmitting 30k$. He was arrested by an undercover cop pretending to be a customer.[29]

Though not directly related to cryptocurrency, Ross Ulbricht was arrested in October 2013 for allegedly running an illegal drug trafficking website, the Silk Road, that used bitcoin as the only payment option. Ulbricht was arrested on charges of alleged murder-for-hire and narcotics trafficking violations and accused of being the founder and chief operator "Dread Pirate Roberts". Silk Road is a hidden website only accessible with Tor. This website is widely known for its illegal products.


On August 6, 2013 Magistrate Judge Amos Mazzant of the Eastern District of Texas federal court ruled that because cryptocurrency (expressly bitcoin) can be used as money (it can be used to purchase goods and services, pay for individual living expenses, and exchanged for conventional currencies), it is a currency or form of money. This ruling allowed for the SEC to have jurisdiction over cases of securities fraud involving cryptocurrency.[30]

GBL, a Chinese bitcoin trading platform suddenly shut down, and up to $5 million worth of bitcoin disappeared with it.[31] Subscribers were unable to log into the Chinese bitcoin platform on October 26, 2013.

In February 2014 cryptocurrency made national headlines due to the world's largest bitcoin exchange, Mt. Gox, declaring bankruptcy. The company stated that it had lost nearly $473 million of their customer's bitcoins likely due to theft. This was equivalent to approximately 750,000 bitcoins, or about 7% of all the bitcoins in existence. Due to this crisis, among other news, the price of a bitcoin fell from a high of about $1,160 in December to under $400 in February.[32]


Cryptocurrencies use various timestamping schemes to avoid the need for a trusted third party to timestamp transactions added to the blockchain ledger.

Proof-of-work schemes

The first timestamping scheme invented was the proof-of-work scheme. The most widely used proof-of-work schemes are based on SHA-256, which was introduced by bitcoin, and scrypt, which is used by currencies such as Litecoin.[17] The latter now dominates over the world of cryptocurrencies, with at least 480 confirmed implementations.[33]

Some other hashing algorithms that are used for proof-of-work include Blake, SHA-3, and X11.

Proof-of-stake and combined schemes

Some cryptocurrencies, such as Peercoin, use a combined proof-of-work/proof-of-stake scheme,[17][34] while others such as BlackCoin[35] exclusively use proof-of-stake.

List of cryptocurrencies

This is a list of some of the well-known cryptocurrencies. There were more than 530 cryptocurrencies available for trade in online markets as of 7 November 2014 but only 10 of them had market capitalizations over $10 million.[36]
Release Currency Symbol Founder Hash Algorithm Timestamping
2009 Bitcoin[nt 1] BTC[37][38] Satoshi Nakamoto[nt 2][39] SHA-256d[40][41] POW[41][42]
2011 Namecoin[nt 3] NMC Vincent Durham[43][44] SHA-256 POW
2011[41] Litecoin[nt 4] LTC Charles Lee[39] scrypt[41] POW
2012[41] Peercoin PPC Sunny King
SHA-256[46] POW & POS
2013 Ripple[nt 5][47][48][49] XRP[49] Chris Larsen &
Jed McCaleb[50]
ECDSA[51] "Consensus"
2013 Mastercoin MSC J. R. Willett [52] SHA-256d[53] N/A
2013 Primecoin XPM Sunny King
1CC/2CC/TWN[54] POW[54]
2013 Dogecoin[nt 6] DOGE Jackson Palmer
& Billy Markus[55]
scrypt[56] POW
2014[57] Darkcoin[nt 7] DRK Evan Duffield &
Kyle Hagan[58]
X11 POW & POS[nt 8]
2014 Auroracoin AUR Baldur Odinsson
scrypt POW
2014 BlackCoin BC, BLK POS


  1. ^ The first decentralized ledger currency.
  2. ^ It is not known whether the name "Satoshi Nakamoto" is real or a pseudonym, or whether it represents one person or a group of people.
  3. ^ A cryptocurrency that also acts as an alternative, decentralized DNS.
  4. ^ The first successful scrypt cryptocurrency.
  5. ^ A unique cryptocurrency based on peer to peer debt transfer. The term Ripple can also refer to both the digital currency (also known as XRP), or to the payment network on which it and other digital currencies can be traded.
  6. ^ A cryptocurrency based on an internet meme.
  7. ^ A cryptocurrency that adds privacy to transactions through a decentralized coin-mixing system called Darksend.
  8. ^ Via Masternodes containing 1000 DRK as "Proof of Service". Through an automated voting mechanism, one Masternode is selected per block and receives 20% of mining rewards.


  • Some have expressed concern that cryptocurrencies are extremely risky due to their very high volatility[60] and potential for pump and dump schemes[61]
  • Some cryptocurrency systems are pre-mined, have hidden launches, or have extreme rewards for the first miners.[62] Pre-mining means currency is generated by the currency's founders prior to mining code being released to the public.[63] It often refers to a deceptive practice, but can also be used as an inherent part of a digital cryptocurrency's design, as in the case of Ripple or Nxt.[64]
  • Most cryptocurrencies are duplicates of existing cryptocurrencies with minor changes and no novel technical developments. One such, "Coinye West", a comedy cryptocurrency alluding to the rapper Kanye West, was served a cease-and-desist letter on January 7, 2014, for using West's name and implying a connection that did not exist.[65]
  • Very few cryptocurrencies can be exchanged for fiat currencies and instead can only be traded for other cryptocurrencies. Banks generally do not offer services for them and sometimes refuse to offer services to virtual-currency companies.[66]
  • There are ways to permanently lose cryptocurrency from local storage due to malware or data loss. This can also happen through the destruction of the physical media, effectively removing lost cryptocurrencies forever from their markets.[67]
  • There are many perceived criteria that cryptocurrencies must reach before they can become a mainstream currency. Because cryptocurrencies do not fully meet some features of fiat currency, few merchants accept them, weakening the value of cryptocurrency.[68]
  • With technological advancement in some cryptocurrencies, the cost of entry is high for casual miners who “mine” or produce cryptocurrency coins through specialized hardware and software.[69]
  • Cryptocurrency transactions are irreversible. One of the features cryptocurrency lacks in comparison to conventional methods of payment is consumer protection against fraud, such as chargebacks to credit cards.[70]
  • Some coins may be a project with little to no community backing and no visible developer.[71]
  • While cryptocurrencies are digital currencies that are managed through advanced encryption techniques, many governments have taken a cautious approach toward them, fearing their lack of central control and the effects they could have on financial security.[72]
  • Environmentally conscious people are concerned with the enormous amount of energy that goes into mining cryptocurrency with little to show in return.[73]
  • Traditional financial products have strong consumer protections. However, if Bitcoins are lost or stolen, there is no intermediary with the power to limit consumer losses.[74]
  • Regulators in several countries have warned against their use and some have taken concrete regulatory measures to dissuade users.[75]

See also


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  2. ^ Bitcoin-block-signing History, 2 March 2014
  3. ^ Deflation and Banking, 19 December 2006
  4. ^ Bitcoin Creation Mechanism, 12 January 2014
  5. ^ Listing of active coins, 27 February 2014
  6. ^ another authentication protocol forked from P.O.S., 7 June 2013
  7. ^ Jerry Brito and Andrea Castillo (2013). "Bitcoin: A Primer for Policymakers". Mercatus Center. George Mason University. Retrieved 22 October 2013. 
  8. ^ How Cryptocurrencies Could Upend Banks' Monetary Role, American Banker, 26 May 2013
  9. ^ The FBI's Plan For The Millions Worth Of Bitcoins Seized From Silk Road, Forbes, 4 October 2013
  10. ^ "Zerocoin - Making bitcoin anonymous". 2013. Retrieved 2 June 2014. 
  11. ^ 'Zerocoin' Add-on For Bitcoin Could Make It Truly Anonymous And Untraceable, Forbes, 26 May 2013
  12. ^ Matthew Green (26 May 2013). "Zerocoin: Anonymous Distributed E-Cash from Bitcoin" (pdf).  
  13. ^ This is Huge: Gold 2.0 - Can code and competition build a better Bitcoin?, New Bitcoin World, 26 May 2013
  14. ^ BITCOIN A Primer for Policymakers, JERRY BRITO AND ANDREA CASTILLO, Mercatus Center, George Mason University, 31-08-2013
  15. ^ What is Bitcoin Mining?, The Genesis Block, 26 May 2013
  16. ^ Bitcoin developer chats about regulation, open source, and the elusive Satoshi Nakamoto, PCWorld, 26-05-2013
  17. ^ a b c Wary of Bitcoin? A guide to some other cryptocurrencies, ars technica, 26-05-2013
  18. ^ "UK launches initiative to explore potential of virtual currencies". The UK News. Retrieved 8 August 2014. 
  19. ^ decentralized currencies impact on central banks, rte News, 3 April 2014
  20. ^ First U.S. Bitcoin ATMs to open soon in Seattle, Austin, Reuters, 18 February 2014
  21. ^ Dogecoin Users Raise $30,000 to Send Jamaican Bobsled Team to Winter Olympics, Digital Trends, 20 January 2014
  22. ^ Dogecoin Community Raising $30,000 for Children's Charity, International Business Times, 4 February 2014
  23. ^ Controls suspend trading in Bitcoin,, 19 December 2013
  24. ^
  25. ^ Bitcoin's Legality Around The World, Forbes, 31 January 2014
  26. ^ 3 Reasons The IRS Bitcoin Ruling Is Good For Bitcoin, Nasdaq, 24 March 2014
  27. ^ Infringement of Kayne West Mark and Other Violations, Pryor Cashman LLP, 6 January 2014
  29. ^ Florida Targets High-Dollar Bitcoin Exchangers, Krebs on Security, February 2014
  30. ^ SEC v Shavers, United States District Court Eastern District Of Texas, 08-06-2013
  31. ^ Vanishing Bitcoins: $5 million in crypto-currency lost down a Chinese memory hole, 21st Century Wire, 12-11-2013
  32. ^ Mt. Gox Seeks Bankruptcy After $480 Million Bitcoin Loss, Carter Dougherty and Grace Huang, Bloomberg News, Feb. 28, 2014
  33. ^ SCRYPT CRYPTOCOINS - CryptoCoinTalk
  34. ^ Sunny King, Scott Nadal (19 August 2012). "PPCoin: Peer-to-Peer Crypto-Currency with Proof-of-Stake". Retrieved 12 May 2013. 
  35. ^ "Bitcoin Is Put Under the Microscope by Its Supporters". 2014-07-22. Retrieved 20 November 2014. 
  36. ^ "Crypto-Currency Market Capitalizations". CoinMarketCap. November 7, 2014. Retrieved 2014-11-07. 
  37. ^ Dixon, Lance (24 December 2013). "Building Bitcoin use in South Florida and beyond". Miami Herald. Retrieved 24 January 2014. 
  38. ^ Spaven, Emily (3 December 2013). "Bitcoin price could reach $98,500, say Wall Street analysts". CoinDesk. Retrieved 24 January 2014. 
  39. ^ a b McMillan, Robert (30 August 2013). "Ex-Googler gives the world a better Bitcoin".  
  40. ^ Taylor, Michael Bedford (2013). "Bitcoin and the age of bespoke silicon" (PDF). Proceedings of the 2013 International Conference on Compilers, Architectures and Synthesis for Embedded Systems (Piscataway, NJ:  
  41. ^ a b c d e Steadman, Ian (7 May 2013). "Wary of Bitcoin? A guide to some other crypto currencies". Wired UK (Condé Nast UK). 
  42. ^ Hobson, Dominic (2013). "What is Bitcoin?". XRDS: Crossroads, The ACM Magazine for Students 20 (1) (Association for Computing Machinery). pp. 40–44.  
  43. ^ vinced/namecoin, GitHub
  44. ^ Keller, Levin (2011-03-19). "Namecoin - a distributed name system based on Bitcoin". Prezi. 
  45. ^ a b Boase, Richard (20 November 2013). "Litecoin spikes to $200m market capitalization in five hours". CoinDesk. Retrieved 14 January 2014. 
  46. ^ Bradbury, Danny (7 November 2013). "Third largest crypto currency peercoin moves into spotlight with Vault of Satoshi deal". CoinDesk. Retrieved 14 January 2014. 
  47. ^ Chayka, Kyle (2 July 2013). "What Comes After Bitcoin?". Pacific Standard. Retrieved 18 Jan 2014. 
  48. ^ Vega, Danny (4 December 2013). "Ripple's Big Move: Mining Crypto currency with a Purpose".  
  49. ^ a b Brown, Ariella (17 May 2013). "10 things you need to know about Ripple". CoinDesk. Retrieved 15 January 2014. 
  50. ^ Simonite, Tom (11 April 2013). "Big-name investors back effort to build a better Bitcoin".  
  51. ^ "How it works - Ripple Wiki". Retrieved 20 January 2014. 
  52. ^ Buterin, Vitalik (4 November 2013). "Mastercoin: A Second-Generation Protocol on the Bitcoin Blockchain". Bitcoin Magazine. Retrieved 9 January 2014. 
  53. ^ "Mastercoin Spec". Retrieved 2 April 2014. 
  54. ^ a b "FAQ · primecoin/primecoin Wiki · GitHub". Retrieved 20 January 2014. 
  55. ^ Chang, Jon M (27 December 2013). "Bitcoin alternative 'Dogecoin' hacked, 21 million coins stolen". ABC News (website) (ABC News Internet Ventures, Yahoo! – ABC News Network). Retrieved 14 January 2014. 
  56. ^ "Intro - Dogecoin # Technical specifications". Retrieved 14 December 2013. 
  57. ^
  58. ^ Scharr, Jill (28 May 2014). "What is Darkcoin? An FAQ". Tom's Guide. 
  59. ^ Casey, Michael J. (2014-03-05). "Auroracoin already third-biggest cryptocoin–and it's not even out yet". The Wall Street Journal. 
  60. ^ "Bitcoin's Volatility Problem: Why Today's Selloff Won't Be the Last". Businessweek. 5 December 2013. Retrieved 29 December 2013. 
  61. ^ "A crypto-currency primer: Bitcoin vs. Litecoin". ZDNet. 14 December 2013. Retrieved 29 December 2013. 
  62. ^ "Scamcoins". August 2013. 
  63. ^ Morris, David Z (24 December 2013). "Beyond bitcoin: Inside the cryptocurrency ecosystem". CNNMoney, a service of CNN, Fortune & Money ( 
  64. ^ Bradbury, Danny (25 June 2013). "Bitcoin's successors: from Litecoin to Freicoin and onwards". The Guardian (Guardian News and Media Limited). Retrieved 11 January 2014. 
  65. ^
  66. ^ Sidel, Robin (22 December 2013). "Banks Mostly Avoid Providing Bitcoin Services. Lenders Don't Share Investors' Enthusiasm for the Virtual-Currency Craze". Retrieved 29 December 2013. 
  67. ^ Keeping Your Cryptocurrency Safe, Center for a Stateless Society, 1 April 2014
  68. ^ The Future of Cryptocurrency, Investopedia, 10 September 2013
  69. ^ Want to make money off Bitcoin mining? Hint: Don't mine, The Week, 15 April 2013
  70. ^ About Bitcoin,, 19 May 2013
  71. ^ Fundamental Analysis for Cryptocurrency, Wall Street Crypto, 10 January 2014
  72. ^ Cryptocurrency and Global Financial Security Panel at Georgetown Diplomacy Conf, MeetUp, 11 April 2014
  73. ^ Experiments in Cryptocurrency Sustainability, Let's Talk Bitcoin, March 2014
  74. ^ Four Reasons You Shouldn't Buy Bitcoins, Forbes, 3 April 2013
  75. ^ Schwartzkopff, Frances (17 December 2013). "Bitcoins Spark Regulatory Crackdown as Denmark Drafts Rules". Bloomberg. Retrieved 29 December 2013. 
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