Looks like someone solved the puzzle and withdrew the bitcoins https://bitcoinchallenge.codes/
Edit : Solved by "Marc" . Update from the original post https://www.reddit.com/r/Bitcoin/comments/9kq7it/introducing_the_310_btc_bitcoin_challenge/
submitted by /u/100ravp
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Source and link to Reddit topic: Someone solved the 310.00 BTC challenge
Author: Reddit.com
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