I would suggest everyone shuts down there wallets in the meantime, also this is a good time to take that extra backup if you haven't already.
The following exchanges have confirmed they will be taking NLG down.
Bittrex (Direct communication with Dev)
Swisscex(Direct communication with myself)
Bleutrade(Direct communication with community member)
Coin Swap have also said they will have NLG offline but don't have direct chat with them going.
See you all on the otherside
