A crypto trader from the Netherlands had been brutally tortured in front of his 4-year-old daughter, by 3 suspects disguised as police. The investigator suspected that the criminals stole some private keys, passwords that transferred the victim's fund to the suspect's wallet. How could the criminal know his a trader and identity, location? Could this be an inside job?
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I am sure the person who committed the crime is the closest person. It could be family and friends, it would be difficult to know if people use bitcoin or not if they don't have a close relationship.