Depositing NEM on Coincheck is currently being restricted. Deposits made to your account will not be reflected in your balance, and we advise all users to refrain from making deposits until the restriction has been lifted. We sincerely apologize for the inconvenience this has caused everyone. Please follow the official Coincheck blog and our official social media accounts for updates. Thank you.
From @Inside_NEM twitter: NEM is creating an automated tagging system that will be ready in 24-48 hours. This automated system will follow the money and tag any account that receives tainted money. NEM has already shown exchanges how to check if an account has been tagged.