Good job to the team for having this creative way of promoting their brand.

I didn't think of it, but it's also a good riddle, although I couldn't be sure of the reward.

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Not sure, but they only mentioned decoding it and getting 2.1BTC, I think it ready at an address.

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Why not? they are promoting their exchange, keeping their payment promise will enhance their reputation

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Yes, it is new, requires intelligence, it is difficult to find the private key. That's why i want to know if someone can decode it Cheesy