Bybit, a major cryptocurrency exchange, has been hacked to the tune of $1.5 billion in digital assets, in what’s estimated to be the largest crypto heist in history.

Bybit has returned to a 1:1 backing of client assets and has fully closed the “ether gap” it faced after an unprecedented $1.4 billion hack hit the exchange late Friday.

Hackers stole about $1.5bn in crypto tokens from Bybit, in a heist the digital asset exchange described as the biggest theft to hit the industry. Ethereum coins were been taken from Bybit’s offline or “cold” wallet, the exchange’s chief executive Ben Zhou said in a post on X.