Improvements to Monero's protocol and features are, in part, the task of the Monero Research Lab (MRL), some of whom are anonymous.
Monero's key features are those around privacy and anonymity. Even though it is a public and decentralized ledger, all transaction details are obfuscated. This contrasts to bitcoin, where all transaction details, user addresses, and wallet balances are public and transparent. These features have given Monero a loyal following among crypto anarchists, cypherpunks, and privacy advocates.
The transaction outputs, or notes, of users sending Monero are obfuscated through ring signatures, which groups a sender's outputs with other decoy outputs. Encryption of transaction amounts began in 2017 with the implementation of ring confidential transactions (RingCTs). Developers also implemented a zero-knowledge proof method, "Bulletproofs", which guarantee a transaction occurred without revealing its value. Monero recipients are protected through "stealth addresses", addresses generated by users to receive funds, but untraceable to an owner by a network observer. These privacy features are enforced on the network by default.
In April 2017, researchers 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, "Leveraging Output Merging", involves tracking transactions where two outputs belong to the same user, such as when they send funds to themselves ("churning"). Finally, "Temporal Analysis", shows that predicting the right output in a ring signature could potentially be easier than previously thought. In 2018, researchers presented possible vulnerabilities in a paper titled "An Empirical Analysis of Traceability in the Monero Blockchain".
Monero's privacy features have made it popular for illicit purposes.
Hackers have embedded malware into websites and applications that hijack victim CPUs to mine Monero (sometimes called cryptojacking). In late 2017, malware and antivirus service providers blocked Coinhive, a JavaScript implementation of a Monero miner that was embedded in websites and apps, in some cases by hackers. Coinhive generated the script as an alternative to advertisements; a website or app could embed it, and use website visitor's CPU to mine the cryptocurrency while the visitor is consuming the content of the webpage, with the site or app owner getting a percentage of the mined coins. Some websites and apps did this without informing visitors, or in some cases using all possible system resources. As a result, the script was blocked by companies offering ad blocking subscription lists, antivirus services, and antimalware services. Coinhive had been previously found hidden in Showtime-owned streaming platforms and Starbucks Wi-Fi hotspots in Argentina. Researchers in 2018 found similar malware that mined Monero and sent it to Kim Il-sung University in North Korea.
The attribution of Monero to illicit markets has influenced some exchanges to forgo listing it. This has made it more difficult for users to exchange Monero for fiat currencies or other cryptocurrencies. Exchanges in South Korea and Australia have delisted Monero and other privacy coins due to regulatory pressure.
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