GNU+Linux is currently being used to kill civilians in several wars, but we don't feel the need to point that out every time somebody says they use Arch btw.

Good tech can be used by bad people without everybody having to distance themselves from the tech itself.

That's not to say that BTC is good tech, but it's a decent proof of concept to free digital transactions from monopolists and tyrants.

I'm saying that no matter what I see, illusory or not, I cannot doubt that I am seeing it.

Does conscipusness exist at all?

Yes. The entire physical world may be an illusion for all I know, but the only thing I can be truly certain of is my conscious experience of it. There is simply no way for me to doubt my own consciousness as such, but I can doubt what I am conscious of.