The Lightning Network Privacy Big Picture: Don't Forget the NSA
Briefly

Global Passive Adversaries, who can monitor all internet connections, pose a significant risk to the anonymity of networks like Lightning. They can't see message details, but can identify where messages originate and where they arrive.
The Lightning Network significantly improves consumer privacy over on-chain payments, allowing senders to remain anonymous to merchants. However, its vulnerability to powerful global adversaries remains a fundamental issue.
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