The mixer was sanctioned after a North Korea hacking group used the software to launder more than $455 million.

A sharp increase in crypto-currency related sanctions resulted in far more crypto transactions being considered illicit.

During the International Counter Ransomware Summit in Washington, participants will discuss how to increase resilience against ransomware.

They pointed to the use of apps such as China-based Alipay and Russia-based Qiwi as a growing problem and a national security threat.