WSJ 1/28/19: "Two groups of highly sophisticated cyber criminals likely have stolen some $1 billion in cryptocurrency hacks, a sum that accounts for the majority of the money lost in such scams, according to a new report from Chainalysis.
Moreover, the two entities probably are still active, said Philip Gradwell, the chief economist at Chainalysis, a maker of software that tracks cryptocurrency transactions.
Chainalysis, which plans to publicly release its findings Monday morning, spent about three months tracking the funds stolen in known hacks. The firm said that there is a chance its analysis is incorrect and that it is unsure of the identities of the two groups."
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