I've got a number of torrents in my queue that I reactivate from time to time. Several of them no longer feature a working tracker at all. And are no longer available from where I originally downloaded them. Yet, they still have peers. Though I'm often the only seed, I doubt theses are peers still kicking around from late 2009.
They're being added to the pool somehow and I'm wondering if it's not some sort of DHT indexer. Something like this exist?
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