DOJ officials say they tracked the owner and users of the dark web child-porn site Welcome to Video by working with Chainalysis to trace bitcoin transactions (Lily Hay Newman/Wired)

Lily Hay Newman / Wired:
DOJ officials say they tracked the owner and users of the dark web child-porn site Welcome to Video by working with Chainalysis to trace bitcoin transactions  —  Federal investigators focused not on offensive hacking efforts or surveilling communications, but on the transactions using cryptocurrency.