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The predictions are really hard, especially at the moment I find it hard. The bitcoin is in a bad position and if we look at the marketcap, the market cap of the altcoins has just passed the bitcoin as it was at its highest in December.
If Lightning tests prove conclusive and the technology is adopted, then bitcoin could of course increase significantly in 2018.
If, on the other hand, there is the slightest problem with the technology or the way it spreads, then people will definitely turn to competing altcoins who already have more potential than the BTC. For me 2018-219 will be the pivotal period for the future of the BTC.

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