You bought a house that had a murder X years ago and are wondering if your guilty for the murder, probably not - aslong as you don't do more murder in it.
I suppose real life is more interesting though, the guy who picked up the domain to stop the global ransomware crisis was picked up after Defcon if memory serves.
Ironically your probably at more risk from the GDPR for leaking those IP addresses that connected to the box via your blog post.
I'm not a lawyer/solicitor though, don't take my advise.
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