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how do you know the coin is going to be at exactly 8.4 by end of 2017 ?

It says in their whitepaper. They guarantee it will increase.

how can they guarantee me that on a FREE MARKET the price is going to be 8.4$ ?

try to go to their website and read their statement on money back, when you buy at 0.13 cents per coin. They guarantee to increase the price at $1.76 per coin then, assuming it will sold out the projected coins at the end of the 2017 it will increase to $8.4

they guarantee to increase the price at $1.76 on October after the pre - sale

so it s not a free market , As they set the Price , that seems similar to the Onecoin scam

THe price is set after the Pre-sale because it is been projected the initial price. It is $1.76 per coin. After that it is all depends on the market condition. However, 8.40 is within 2 years. It is a conservative estimate.
Before you conclude, you read and investigate on this coin. if you have any evidence it is a scam, please let me know also. But I read everything it is totally legit for my understanding.

plus bonuses when you refer to someone.

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