Password exchanges Binance and Huobi on Tuesday froze 1.4 million dollars in passwords related to the heqiao robbery and North Korean cyber hackers, according to password tracking company Elliptic.

Elliptic pointed out in an online article that it brought intelligence information to the exchanges, prompting them to freeze their accounts. The company said a $100m hack that traced these assets back to a "bridge" that allows Harmony blockchain technology customers to move password property between ecosystems.

Binance and Huobi didn't immediately respond to requests for comment.

Federal investigators reprimanded Lazarus Group, North Korea's notorious hacker alliance, for attacking overpasses as part of years of stealing hundreds of millions of dollars in passwords from exchanges and infrastructure construction. Investigators say the move has brought assets to North Korea's nuclear bomb program.

Elliptic further claims that it tracks frozen Harmony equity funds mainly through Tornado Cash, a hybrid privacy-focused service that claims to hide a person's footprints in the books of public etheric Fong. The United States banned North Korean cyber hackers on suspicion of using sandstorm cash.