Hey!
Steinar Haug, Nethelp consulting, sthaug@nethelp.no Because they publish data you have signed. They don't have the ability to modify the data and then sign that modification as if they were you if they aren't holding the private key. If they are holding the private key, then, you have, in essence, given them power of attorney to administer your network.
If you're OK with that, more power to you. It's not the trust model I would prefer.
I think that is the whole point. Hosted is fine with some, top-down will be preferred by others. Will top-down be intrinsically more secure than hosted? I am tempted to say yes, but I have some doubts on that too. What top-down certainly does is getting you out of the lawyers' sights. Mostly anyways.
Owen Carlos