http://xa63tpfoaqt3zru2ehxjjfbpadwj4ha6qsdvtcqtyr3b7hmt4iaq.b32.i2p/spec.html
Type: search Attributes:
* scope: base64 of the SHA256 of the channel's identity public key, or "all" (string[])
* author: "authorized", "manager", "owner", "any" (string)
* postbyscope: base64 of the SHA256 of the posting author's identity public key (string[])
* age: number of days in the past to look back for the post's creation date (integer)
* agelocal: like age, but measures when the local archive received the message (integer)
* unreadonly: if true, only...