Onion services are services that are only accessible via the Tor network.
This graph shows the number of unique .onion addresses for version 2 onion services in the network per day. These numbers are extrapolated from aggregated statistics on unique version 2 .onion addresses reported by single relays acting as onion-service directories, if at least 1% of relays reported these statistics. For more details on the extrapolation algorithm, see this blog post and this technical report.
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