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Happy to have our paper "On the state of V3 onion services" for FOCI'21 now online: digidow.eu/publications/2021-hoeller-foci/Hoeller_2021_FOCI2021_V3OnionServiceStats.pdf Measuring Tor onion services without compromising the privacy of individual Tor users is a difficult compromise. We estimate between 600k and 700k services Mar-Apr 2021.
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Usage of onion service descriptors show pretty interesting patterns: 77.5% of all download requests received were asking for only the most popular 1% of blinded public keys (with a long tail). While we don't know for certain yet, we speculate (some of) these are C&C servers.