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So, as Meiklejohn’s first step, she simply tried the technique Satoshi had inadvertently suggested—across every Bitcoin payment ever carried out. She scanned her blockchain database for every multi-input transaction, linking all of those double, triple, or even hundredfold inputs to single identities. The result immediately reduced the number of potential Bitcoin users from twelve million to date to around five million, slicing away more than half of the problem.
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Andy Greenberg (Tracers in the Dark: The Global Hunt for the Crime Lords of Cryptocurrency)