Off flame ramblings follow:
It's time well spent going back through this thread a couple times (long though it may be) and seeing for example that:
1) The Phoenix and the Turtle poem was referenced in post #338 on April 5th, 2015
Based on what I have read regarding previous challenges, ytcoin_artist doesn't give hints but does let people know if they are on the right track and confirmed found clues to previous ARG challenges. The fact that she tweeted a section of the poem might be to say "you found this clue but didn't think it was the next step, look again" I couldn't find her giving any hints or clues aside from this one...
2) The skinny inner flame data channel was detailed in post #404 possibly before that as well, then re-discovered recently by smracer. This game has gone on so long that people have forgotten what was tried, abandoned, rediscovered etc.
BitcoinArbiter in post #400 posted a link to some of Rob Myers work
https://robmyers.org/blockchain-aesthetics/It would seem that coin_artist and Rob Myers are tight collaborators
His blockchain-aesthetics code was done around the time this painting was created
some of the code has instructions to "draw" blockchain transactions using "turtle graphics"
I am not a programmer, perhaps someone with better skills can use the code here:
https://github.com/robmyers/blockchain-aesthetics/and make the turtle graphics code examine and draw the transactions done on the 1FLAME address like
this one?
Just delving back into the crazy...
This could be a good one, there is no need of programming skills for running the code, download the zip from github and launch "transactions-.html" you will see the results on your browser. The javaScript functions takes data from a live web-socket in JSON format, from here 'wss://ws.blockchain.info/inv', later parses data and takes the "hash", in our case should be "9c6d9a78bb8a7ee9f78af0944edce9abbe67f835355ba872da618abb6b841f47" as you said.
I could try to modify the code later, for using only that hash, but my coding habilities are limited on Js, perhaps someone with better skills could lend us a hand.