http://q3o3hdjbia2v4hjag567piljrz6gmfwfmxjzaqq4qstmicnmujxp45id.onion/guides/onion-mirror-guidelines
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Admins,
To reduce the impact of phishing and to ease automatic PGP verification
of mirrors, dark.fail is now defining the Onion Mirror Guidelines. (“OMG”)
Admins that implement this standard show a commitment to user safety
by proving ownership of all URLs associated with their site, and by
committing to regularly prove control of their PGP key.