Imagine the following police investigation: Investigators request information from, for example, Facebook, from a certain profile. Facebook delivers the IP address associated with the profile, and leads investigators to an exit node from Tor. If the node stored the IP addresses, the police could pull the thread: they would request information about the stored IPs from the appropriate agencies, such as Internet access providers, and they would go as far as an intermediate node, and then to the entry node, which does know the clients' IP.
I know that this assumption is very complex, because nodes handle many connections (researchers could find thousands of IPs to analyze) and, in addition, the nodes of a connection are usually in different countries. But the question is the same: Do the Tor nodes, by default, store the IP of the incoming connections?
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