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I thought both Tor and I2P use DHT (distributed hash tables) for the list of nodes, no?
Correct. However, DHT is just a data structure. The two protocols build their DHT in different ways.
Tor relays advertise their presence to centralized discovery servers which help users have a complete view of the network topography.
I2P routers bootstrap their connections using tunnels to other routers. Then each router builds its own local view of the network over time. Similar to LN.
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