I do wish that players could watermark it in a way that would make it impossible for players to claim it as their own.
This, on the other hand, could be rather useful, but unneeded.
I always add print bricks/print events all over my build to decrease the chance of someone taking my build (the reason for this is a lot more involve than anyone would ever wishes to hear). Whenever starting a new build, I do a [Onactivate] [Minigame] [Centerprintall] [This is the property of Blocky999, BL_ID 15932. If this message is found, please report it to me.]. I make really big builds with a large number of baseplates, so the prospect of anyone stealing my build, then claiming it as theirs, is impossibru.