I don't think JP Morgan is going to give you the private key to your bond. This is a slightly more decentralized version of holding securities in street name. It's less painful than direct registration, it's publicly auditable, and faster to settle.
I mean, I hear you. I 100% get why people are interested. I just don't see why it has to be a blockchain vs a centralized database that DTCC controls access to.
Eh. Bummer. I could totally be wrong about this, and I'm super curious since a lot of smart people seem to be into it. I just don't see the reasoning behind things.