Owners of a popular bitcoin storage device are being urged to protect their cryptocurrency after security researchers said a software flaw may have allowed attackers to steal roughly $70 million worth of bitcoin in less than an hour.

Forbes first reported the attacks, which researchers at Galaxy Research say drained more than 1,000 bitcoin from 1,196 digital wallets in just 41 minutes on July 30.

Galaxy later identified two additional suspected waves of suspicious activity, bringing the estimated losses to nearly $89 million.

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The firm cautioned that its findings are based on blockchain…

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