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
[link] [comments]

Source and link to Reddit topic: Someone solved the 310.00 BTC challenge

Author: Reddit.com