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.
Metronome, found online at Metronome.io, under the symbol MTN. The cryptocurrency promises to deliver “institutional-class endurance” with cross-blockchain compatibility.The currency is being developed by Bloq, which announced Metronome in October 2017. Metronome is launched in early December 2017, with the first cross-chain transfers (between Ethereum and Ethereum Classic) scheduled for Q1 2018. Metronome released in December 2017. By Q1 2018, Metronome aims to become the world’s first cross-chain compatible cryptocurrency by adding Ethereum Classic support (the currency is initially built on Ethereum). Metronome’s cross-chain compatibility system involves creating exit receipts when leaving the chain and entering a new chain.