Basically it means you can have a node online with the 1000DRK just for 30 seconds, then you activate a secondary "hot" node with no money in it. After that you can literally power down the first node because in the new implementation the hot and cold node share a signing key.
Very interesting.
And those 30 seconds are basically just the time it takes for the two servers to successfully "shake hands"?
A hot hand shaking a cold hand, and spreading some "warmth".... I like it!
