Fingerprints and host keys.
The above link goes to a file with fingerprints of certificates and public keys used by some services at hack.org. The file is signed with MC's OpenPGP key.
Download the file as a binary file and verify
% gpg --verify host-keys.asc
or similar in your PGP program.
You should already have MC's OpenPGP key, but for completeness it's 4096R/0x7C216BB455CEB57B. Full fingerprint:
FFE4 7E6D 031B 5E72 D3A0 935E 7C21 6BB4 55CE B57B
Note that this a new key since 2012. The new key is signed with the old key, 1024D/0xB22E2C10E4C92FA5 from 2005-10-26.
MC's PGP key is also available on many public key servers, for instance MIT's or hkp://keys.gnupg.net.
Last updated: <2014-06-14 17:09:28 CEST>