doesn't say exactly how it was generated from the blockchain (or if directly at all!).
Loaded the first 2% of the blockchain into Audacity as a raw file import, read as a signed 32 bit PCM dual channel file at 44100 Hz and then some shaping applied (dropped the pitch and added a bit of phasing for some texture) and then finally overlayed with a glitch/synth track and the video.
Although I personally prefer:
cat ~/.bitcoin/blk0001.dat > /dev/audio