Hello,
I just read the solution article and even with it I had troubles finding the private key. Either there are mistakes in the flame width channel or I did not understand which part of the flame is supposed to be narrow or wide.
I bruteforced the message I found with random permutations until it contained a valid WIF private key. I had 4 bits which did not match in the flame width channel. Here are the 4 flames to which they correspond.
https://i.imgur.com/QH1aSpq.jpgI've written next to them what they are supposed to be, but I had the opposite value in my dataset. Can someone please explain why these flames are supposed to be narrow/wide? Especially why the two top ones are supposed to be narrow? Isn't it the width of the inner color which matters?
EDIT: the wrong flames were circled in the first posted image