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|Original author(s)||Nicolas van Saberhagen|
|White paper||CryptoNote v 2.0|
|Initial release||18 April 2014|
|Latest release||0.13.0.3 / 14 October 2018|
|Operating system||Windows, Linux, macOS, BSD, Solaris|
|Source model||BSD 3-Clause|
|Issuance||Decentralized, block reward|
|Block time||2 minutes (previously 1 minute)|
|Circulating supply||16,250,168 XMR (as of 22 July 2018[update])|
|Exchange rate||$114 (as of 6 September 2018[update])|
|Market cap||US$2.1 billion (as of 22 July 2018[update])|
Monero (XMR) is an open-source cryptocurrency created in April 2014 that focuses on fungibility and decentralization. Monero uses an obfuscated public ledger, meaning anybody can broadcast or send transactions, but no outside observer can tell the source, amount or destination. Monero uses a Proof of Work mechanism to issue new coins and incentivize miners to secure the network and validate transactions.
The privacy afforded by Monero has attracted illicit use by people interested in evading law enforcement during events such as the WannaCry Ransomware Attack, or on the dark web buying illegal substances. Despite this, Monero is actively encouraged to those seeking financial privacy, since payments and account balances remain entirely hidden, which is not the standard for most cryptocurrencies.
Unlike many cryptocurrencies that are derivatives of Bitcoin, Monero is based on the CryptoNight proof-of-work hash algorithm, which comes from the CryptoNote protocol. It possesses significant algorithmic differences relating to blockchain obfuscation.
In particular, the ring signatures mix the spender's input with a group of others, making it exponentially more difficult to establish a link between each subsequent transaction. Also, the "stealth addresses" generated for each transaction make it impossible to discover the actual destination address of a transaction by anyone else other than the sender and the receiver. Finally, the "ring confidential transactions" mechanism hides the transferred amount.
Monero is designed to be resistant to application-specific integrated circuit mining, which is commonly used to mine other cryptocurrencies such as Bitcoin. It can be mined somewhat efficiently on consumer grade hardware such as x86, x86-64, ARM and GPUs.
In 2014 Bitcointalk forum user known as thankful_for_today forked the codebase of Bytecoin into the name BitMonero, which is a compound of Bit (as in Bitcoin) and Monero (literally meaning "coin" in Esperanto). The release of BitMonero was very poorly received by the community that initially backed it. Plans to fix and improve Bytecoin with changes to block time, tail emission and block reward had all been ignored, and thankful_for_today simply disappeared from the development scene. A group of users led by Johnny Mnemonic decided that the community should take over the project, and five days later they did while also changing the name to be Monero.
Due its privacy features, Monero experienced rapid growth in market capitalization and transaction volume during the year 2016, faster and bigger than any other cytocurrency that year. This grown was driven by its uptake in the darknet market, where people used it to buy stolen credit cards, guns, and drugs. Two major darknet market were shut down in July 2017 by law enforcement. From the beginning, Monero has been used by people holding other cryptocurrencies like Bitcoin to break link between transactions, with the other cryptocoins first converted to Monero, then after some delay, converted back and sent to an address unrelated to those used before.
On January 10, 2017, the privacy of Monero transactions were further strengthened by the adoption of Bitcoin Core developer Gregory Maxwell's algorithm Confidential Transactions, hiding the amounts being transacted, in combination with an improved version of Ring Signatures.
After many online payment platforms shut down access for white nationalists following the Unite the Right rally in 2017, some of them, including Christopher Cantwell and Andrew Auernheimer ("weev"), started using and promoting Monero.
The operators behind the May 2017 global ransomware incident WannaCry converted their proceeds into Monero. In June, The Shadow Brokers, the group that leaked the code used in WannaCry, started accepting payments in Monero.
As of May 2018 Monero was led by 7 members, 49 developers and 3 researchers, with the unofficial figurehead of pseudonymous Luigi1111.
In April 2017 research highlighted three major threats to Monero users' privacy. The first relies on leveraging the ring signature size of zero, and ability to see the output amounts. The second, described as "Leveraging Output Merging", involves tracking transactions where two outputs belong to the same user, such as when a user is sending the funds to himself ("churning"). Finally the third threat, "Temporal Analysis", shows that predicting the right output in a ring signature could potentially be easier than previously thought.
Monero development team addressed the first concern in January 2017, prior to the actual release of the research paper, with introduction of Ring Confidential Transactions (RingCT) as well as mandating a minimum size of ring signatures in the March 2016 protocol upgrade. Monero developers also noted that Monero Research Labs, their academic and research arm, already noted and outlined the deficiency in two public research papers in 2014 and 2015.