South Korean cryptocurrency exchange Coinone announced that it will no longer permit withdrawals of tokens from unverified external wallets beginning in January.

Coinone made an announcement on Wednesday. The exchange would require users to register their wallets from December 30, 2013 to January 23, and then it would limit withdrawals. The exchange specified that crypto users could only register their own wallets, and the verification process “may take some time” and could change in the future.