When a relay or HSP broadcasts its key (non exit node), how does a TOR client find it?
How is the propagation of exit nodes and relay nodes (or HSPs) shared?
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All relays publish their descriptor to the directory servers.
All hidden services publish their service to the hidden service directory.
When a Tor client builds a circuit, it asks the directory server for a guard, middle, and exit relay. When you connect to a hidden service, it asks the hidden service directory for the required information to connect.