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They are known, but the point of a decentralized blockchain is that there is no central authority to 'blacklist' them. Furthermore, there are methods by which
by larkeith 9y ago
They are known, but the point of a decentralized blockchain is that there is no central authority to 'blacklist' them.
Furthermore, there are methods by which bitcoins can be anonymized once obtained: look up 'bitcoin tumbler'.