I regret to be this anal - nettime is not (that) technical forum, but in
this case blockchain has has nothing to do with securing IoT
communications. At best, blockchain can provide authentication (ie.
public key tied to identity), with properly expensive PoW, which is not
the case here.
This reminds me that there is one sensible use of blockchain: public key
directory. Too bad no one uses PGP any more.
Which brings me to another really interesting question: why don't DNS
CAs use blockchains for storing certificate chains, instead of burning
them into browsers via custom deals with multiple browser peddlers?
I believe that this use of blockchain is simply as a secure protocol for
the internet-of-things – and for (future) autonomous driving. (It's that
potential external control of one's car – or whatever – that's spooky.)
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