Every 60 seconds, every player on the server receives a unique random item or block that they can use. You can use these blocks to trade with others, build a new structure, or do something else.
The world and all dimensions is a complete void; no natural world generation occurs (other than a bedrock pillar at 0,0,0). Players can build from Y -64 to 415, a 115 block increase from the default 320 build limit.
You cannot destroy other players’ blocks; only your own (or those who have placed you in their trust list). This allows you to create permanent structures without worrying about someone destroying it. Be wary, however, as structures near spawn are likely to be griefed with block placement.
Naturally generated blocks, such as cobblestone generators, moss, and trees grown from saplings are not allocated to any players, and can be destroyed freely by anyone.