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Scrypt is used in many cryptocurrencies as a proof-of-work algorithm (more precisely, as the hash function in the Hashcash proof-of-work algorithm). It was first implemented for Tenebrix (released in September 2011) and served as the basis for Litecoin and Dogecoin, which also adopted its scrypt algorithm.
Litecoin was a source code fork of the Bitcoin Core client, originally differing by having a decreased block generation time (2.5 minutes), increased maximum number of coins, different hashing algorithm (scrypt, instead of SHA-256), faster difficulty retarget, and a slightly modified GUI.
Litecoin: LTC, Ł Charlie Lee: Scrypt: C++ [10] PoW: One of the first cryptocurrencies to use scrypt as a hashing algorithm. 2011 Namecoin: NMC Vincent Durham [11] [12]
The following tables compare general and technical information for a number of cryptographic hash functions. See the individual functions' articles for further information.
The most widely used proof-of-work schemes are based on SHA-256 and scrypt. [19] 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 ...
Litecoin's scrypt variant has not been demonstrated to offer any practical benefit compared to other proof-of-work algorithms at all, so I must disagree that it can be considered a feature. While perhaps a more broad definition of "feature" does apply, in the context the word is being used in the article, it clearly does not.
Equihash is a memory-hard Proof-of-work algorithm introduced by the University of Luxembourg's Interdisciplinary Centre for Security, Reliability and Trust (SnT) at the 2016 Network and Distributed System Security Symposium.
The Secure Hash Algorithms are a family of cryptographic hash functions published by the National Institute of Standards and Technology (NIST) as a U.S. Federal Information Processing Standard (FIPS), including: