“Tor metrics are the ammunition that lets Tor and other security advocates argue for a more private and secure Internet from a position of data, rather than just dogma or perspective.”
— Bruce Schneier (June 1, 2016)
bridge: a relay whose existence is non-public and which can therefore provide access for blocked clients, often in combination with pluggable transports, which registers itself with the bridge authority.
consensus weight: a value assigned to a relay that is based on bandwidth observed by the relay and bandwidth measured by the directory authorities, included in the hourly published consensus, and used by clients to select relays for their circuits.
onion service: a service (for example, a website or instant-messaging server) that is only accessible via the Tor network.
relay flag: a special (dis-)qualification of relays for circuit positions (for example, "Guard", "Exit", "BadExit"), circuit properties (for example, "Fast", "Stable"), or roles (for example, "Authority", "HSDir"), as assigned by the directory authorities and further defined in the directory protocol specification.
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