BlueTrade Exchange notification:
INFO
[AMBER] Wallet maintenance. A 51% attack was successful at Ambercoin and transactions were erased.
Devs cover their tracks.
I can't acknowledge that, because I don't have an account at Bleutrade, but at C-cex and yobit everything looks fine (excluding price of course

)
You won't be able make a withdrawal your Amber to external wallet.