Quarkcoin is a coin which increases security by using 9 rounds of hashing from 6 different hashing algorithms - blake, bmw, grøstl, JH, keccak, skein. 3 of the hashing rounds apply a random hashing function. This compares with Bitcoin's solitary use of SHA-256 algorithm. There is no pre-mine for this coin. A new block is generated every 30 seconds and 2048 Quark is given out as reward per block at the beginning. This reward halves every 60480 blocks or roughly every 3 weeks. The initial supply of Quark is 247 million and this is expected to be mined in roughly 6 months since launch date. The supply will then continue to increase at an inflationary rate of 0.5% per year. Quarkcoin was launched on 21 July 2013.
Horizen is an inclusive ecosystem where everyone is empowered and rewarded for their contributions. Horizen’s massively scalable platform enables businesses and developers to quickly and affordably create their own public or private blockchains utilizing the largest node network in the industry. Horizen’s Sidechain SDK provides all necessary components for easy and fast deployment of a fully customizable blockchain. Horizen's native cryptocurrency, ZEN, is a mineable PoW coin currently trading on exchanges including Bittrex, Binance, and Changelly. ZEN is integrated on major wallets including Horizen's flagship app, Sphere by Horizen, a multifunctional wallet that serves as an interface with most Horizen products and services.