What will be the second biggest cryptocurrency after Bitcoin in 2019?

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I think you should have clarified biggest in terms of what ? 

If you see the market data, then based on market cap , XRP is already in the second position and fetching a lot of attention from legit entities as well. However, Ethereum is not too far from it. I think, Ethereum is going to beat XRP because I see more and more dapps being built on it. 

And if we are talking about price, then I think, Ethereum is going to be in the second position as well and will beat  Maker  and  Bitcoin Cash once the market recovers . 

Again all these are my personal opinions :)