http://xa63tpfoaqt3zru2ehxjjfbpadwj4ha6qsdvtcqtyr3b7hmt4iaq.b32.i2p/features.html
Alternately, the post may include a publicly
visible prompt, where the correct answer serves to generate the
correct decryption key. ** posting, updating, and/or commenting is authorized by providing those
users with asymmetric private keys to sign the posts with, where the
corresponding public key is included in the forum's metadata as
authorized to post, manage, or comment on the forum.