Bitcoin and Blockchain: two revolutions for the price of one?

Originally posted on Richard Gendal Brown:
I gave a brief talk on Bitcoin and blockchain technology to an audience of non-specialists at a dinner last week.  It covers many of the themes I’ve explored on this blog before. But the short, fifteen-minute, format forced me to be brief and clear.  This is an edited version of the speech A £20 note has an obvious, yet extraordinary super-power.   I can hand it to anybody in this room and £20 of value will be transferred instantly, directly, peer-to-peer, person-to-person. Settlement, with finality, in central bank money!  And nobody else need know.  And…