Everyday at least 1 hacker enters skyblock or other server.But ,everyday at least one helper or staff member is online.If you cant record hackers/cheaters,you may tell it to the staff as fast as possible before the hacker be offline that is one of the ways to catch a hacker but its very difficult and at most times staff will NOT try to do this,it is touching the impossible.However i reccomend to you a screen recorder system such as OBS.*ATTENTION*If a players seems to have anti-knockback be sure to check his ping connection to make sure that he is facing connection problems or he is a hacker.