I have no idea, though while "blockchain" is waaaaaaay overused the
decentralization aspect is interesting. There is also
https://www.orchid.com/ which seems to be similar.
Would be interesting to have one of the qubes sec gurus weigh in on the
security part of this (I believe Joanna Rutkowska, founder of Qubes, now
works on a different-yet-blockchain project Golem?).