[redactsure]

Challenge is back up if anyone is still interested in a try:

https://redactsure.com/bitcoinchallenge/

[howdoibtc]

fwiw I was able to get a private key out of the system, but there's no BTC/transactions associated with it. Dunno if that's an error on my part (although the key has a valid checksum) or the wrong key got uploaded.