Regarding Linkin Park Cypher, much work has been done on it, a wealth of info.
http://scienceblogs.de/klausis-krypto-kolumne/2017/07/22/who-can-decipher-this-encrypted-text-in-a-linkin-park-video/
Multiple meanings can be revealed using different forms of the pigpen cipher.
Who is Hannah?
Hannah Blockis is an actress, known for Linkin Park: In the End (2015).
https://m.imdb.com/name/nm8088579/
A making-of of the video - In the End
The end of the video give clues to the cypher
https://www.youtube.com/watch?time_continue=188&v=oU50KM83Mno&feature=emb_title