That's a very, VERY good start. I'm stealing it. ;-) Y'all should do the same when explaining what this crypto-thing is — and stay away from even mentioning 'coins', stay on "BlockChain" as it is the enabling tech (call it "distributed database" to make it even simpler and non-buzzy); whereas applying it to currency is but one application among many (and possibly not the killer-app that BC needs to emerge in the mainstream).