Defensive hacker returns $ 25 million in 'stolen' crypto currencies
A mystery hacker allegedly stole $ 25m (£ 20m) in crypto-currencies - and then returned the funds two days later.
Records show that funds in a variety of crypto-currencies were withdrawn from the DForce platform based in China.
A sum of $ 10m was taken in Ethereum, for example, while a further $ 10m was taken in digital coins tied to the US dollar and $ 4m in other coins.
Roughly the same amount has now been returned - although in a different mix of crypto-currencies.
DForce is an online service that allows users to make crypto-currency transactions with one another.
"The hackers have attempted to contact us and we intend to enter into discussions with them," wrote DForce founder Mindanao Yang in a blog shortly after the attack happened, on Sunday.
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Mr Yang has promised a further update on the situation later today. The BBC has also contacted DForce for comment.
In a technical blog about the alleged hack, blockchain security firm PeckShield explained how the attacker managed to withdraw crypto-currency by tricking the DForce system.
In essence, the attacker was allegedly able to withdraw funds by convincing the system that money had been deposited, when it had in fact been siphoned away.
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