http://sigmaforum.i2p/post/119?reply_to=422
There is also some backup/debug ability to seed I2P DHT over Tor, but I'm not even sure how and when it works. BiglyBT has its own backup update server and tracker for update torrents in Tor, but clients download those over clearnet (or I2P). To be able to make connections to peers on .onion addresses, you have to make non-obvious changes to settings to route peer connections through Tor proxy.
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