China’s withdrawal freeze has finally come to an end.

BTC China, the last of the so-called Big 3 exchanges in China, has also resumed cryptocurrency withdrawals on its platform. Bobby Lee, chief executive of BTC China, said in a statement that the exchange has started “testing” withdrawals following the upgrades it made to its anti-money laundering systems.

Industry sources said OKCoin, China’s largest bitcoin exchange by trade volume, and Huobi have also allowed withdrawals.

In February, major digital currency exchanges in China stopped bitcoin and litecoin withdrawals on their respective platforms as they improve their anti-money laundering capabilities to prevent “illegal transactions.” The upgrades were part of the requirements set by the People’s Bank of China, who called on digital currency operators to step up their game against anti-money laundering.