The FBI has accused North Korea of stealing $US6.3 billion n ($6.9 million) in virtual assets from the cryptocurrency exchange Binance, in what is thought to be the biggest crypto heist in history.

In a statement, the US bureau said the North Korean state-sponsored unit known as TraderTraitor was responsible for the “malicious cyber activity”.

On Thursday, $US6.3 billion in bitcoin and other digital currency was stolen from Binance, the world’s largest crypto exchange, in what several crypto experts said bore the hallmarks of a North Korean hack.

The FBI’s statement came as Binance offered reassurances it was covering the losses from the hacking attack, saying it has used company funds to buy tokens to replenish 90 per cent of what was…