Based on the picture, I thought of looking up chess annotations as a private key. Others had suggested this based on the bird to find games with Bird's opening, but I didn't know enough about historical chess games for that to help. But then I thought the context of lots of the earlier clues were Alice in Wonderland based (follow the white rabbit, and the everything isn't what it is), and also on the picture there is the phoenix section that sort of looks like "through the looking glass." So then I remembered there was a chess game in the book through the looking glass. Well I researched it and the book actually is a chess game. You can read all about it here:
http://www.chessmaniac.com/lewis-carroll-and-chess/So I used the annotation for Lewis Carol's solution on that page and it worked as a private key when I plugged it in blockchain.info, although the address it gave was empty and never used.
Qh5d4Qc4Qc5d5Qf8d6Qc8d7Ne7Nxe7Nf5d8Qe8Qa6Qxe8
I don't know if the fact that it worked as a private key (length of characters?) is a good sign. I don't know enough about private keys...
I tried a few modulations like exchanging the 7's for 3's (from the 347 clue earlier), but that did nothing.
So anyways I think that's a far as I can contribute as I don't have any of the other skills I witnessed being used when reading the 32 page pdf of the previous puzzle and reading through all the pages on this thread. I really enjoyed the adventure, though, and I can't wait to hear how it gets solved.
If this ends up helping, feel free to donate here: 1BhiQTjG4FbUPBsbQ5v7nHxzmhKt8c9ZKE