I also thought of something similar, it would be very useful, for example, if I made a landscape out of cubes like this, people could build on them if I wanted them to without giving everyone on the server trust.
Another example, I built a hotel that took me 4 hours. Then, I let them delete it without any server trust.
Do you understand how abusive and handicapped this is?
The moment you save, ownership will fail because Blockland saves from the bottom brick-up.
I can't think of a situation in which that will matter.
non-owned brick owner
Actually I can picture this working. Just assign a value such as $brick.public = true; and package the trust checks to return true if the brick being checked is 'public'.
That sounds do-able.