In minecraft some servers send fake blocks to the client until they are close enough and visible. That prevents hacker for looking for specific types of valuabl

In minecraft some servers send fake blocks to the client until they are close enough and visible. That prevents hacker for looking for specific types of valuable blocks like chests and diamonds using x-rays. The drawback is that if the server doesn't send the updates fast enough you might think you've hit a diamond block until you get the update.