Meaty stuff isis .... gonna take some ruminating.

As a first blush .... so it is going to piggy-back onto bitcoin network to broadcast "OPEN" tx requests that then get transformed into bitcoin Tx's by the targetted node that has the required keys to sign the bitcoin tx .. and then rebroadcast on bitcoin network proper?

Just a guess here, but I think mainline will resist this ... but should be enough incentive here for many users to adopt it regardless ( I wonder about how many "OPEN" enabled nodes you are going to need for security considerations)