The blockchain-mad CEO of online retailer Overstock has stepped down amid a confession that he was romantically involved with a suspected Russian spy. Overstock CEO Patrick Byrne issued a letter to shareholders yesterday explaining his decision. He will no longer serve as CEO or sit on its board of directors, effective immediately. Byrne has taken the decision after divulging that he was romantically involved with suspected Russian spy Marina Butina, who is now in prison for not registering with the US government as a foreign agent, Observer reports. Earlier this month, Byrne also confirmed to Fox News that he was…

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