The Brotherhood is a cult..or an ARG I've found that has strong bitcoin associations.
It seems like their belief system is centered around "Destroying the Illuminati",
"Ascending", and using Bitcoin as a way to overthrow the bankers.
The video poster is making bitcoin-related puzzles for participants to solve and even sent one of the clues as an ethereum transaction hex data.
[And hid a hexadecimal message as a private key for eth using sha256].
As well, one of the clues has instructed us to ask: "Who is Satoshi Nakamoto?" "an answer may await"...
Here is their channel:
https://www.youtube.com/channel/UCJolvuxNzyA7pGbztFOJ7hQ/A discord seems to have been set up as well:
https://discord.gg/UzN6nk