Comet (CMT) cryptocurrency is formally accounted on the number of ratings.. However, there is no up-to-date official information about its current status. Therefore, we can conclude that the coin is currently inactive.
Nano is currently based on cryptocurrency DPoS protocol.
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Also you can see the latest NANO price on Cryptogeek.info. You can leave your feedback and reviews about Nano cryptocurrency here.
AirSwap is a Decentralized cryptocurrency exchange based in the USA. The exchange was launched in 2017. It’s reported volume is about 4.5-5 mln. $. The exchange provides peer-to-peer trading and has 3 available trading pairs and 6 coins.