Any MPUs actually actively using blockchain?

Without disclosing anything specific, yes. I remain unconvinced by Bitcoin and its like, but proof-of-stake (rather than proof-of-work) based block chains have application in circumstances where a trusted source of truth is desirable, but a centralised repository infeasible due to political, financial or technical reasons. Blockchain technology is slowly but steadily infiltrating many industries, you just don’t see it publicised except in the sector specific technology press.

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