The cryptocurrency market is explosive which currently serves hundreds of currencies. Almost all of them are obvious scams—including many which purport to have a large market cap. This article aims to list only the most relevant cryptocurrencies in terms of novel technological advancements or strong engineering teams, or due to widespread awareness thereof. Direct, low-level scams should not be listed here.
An altcoin based on Bitcoin's blockchain with replay protection and an increased block size limit of 8MB. An unusual emergency difficulty adjustment algorithm causes significant periods of hyperinflation.
Introduced the X11 algorithm, which is just a composite function of multiple hashing algorithms. Had a significant failure mode in the beginning which equated to a majority premine by a small number of Amazon EC2 customers. This means their Master Node algorithm has been in a failure mode from the beginning.
Majority premine sale. Source of the ICO bubble. Multiple client implementations which fail against each other in terms of consensus errors regularly. Requires multiple months of time to sync to eth blockchain. Contract-building tools interpret input incompatibly.
First cryptocurrency that implemented the zerocoin protocol which also makes it the first useful Zero-knowledge proof based anonymous cryptocurrency. First that implements Merkle Tree Proof of Work (MTP).