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Among the top 100 cryptos in http://coinmarketcap.com/, Li tteCoin(ltc) and EOS might be the most profitable cryptos in 2018. I am not financial advisor but this is my research says. Do your own research and invest accordingly. Although, I would definitely suggest to look into LiteCoin and EOS and their current work in progress and future roadmap. Its just amazing. I will keep updated with may be 1 or 2 more coins that might be in top 3 in terms of profit. Surely we love blockchain technology. But we also want to earn some along the way of this revolution. Be part of this financial revolution.