We are glad to hear you are sorry for your actions. Here are the specific rules you were breaking (Rules can be read here http://wiki.nerd.nu/wiki/Rules ):
No offensive/inappropriate constructions or skins
Do not build too close to another player’s build (see PVE or Creative FAQ for details)
No xraying/hacking/cheating or exploiting bugs to give yourself an unfair advantage. Any use of xray / ore detection will result in an immediate ban and rollback of all edits.
No griefing or block spamming
It is inappropriate to try to acquire objects placed by other players through the use of pistons. This is a type of griefing.
This link contains the proof of these actions. I have not included the image of the offensive build, but I'm sure you know what I'm talking about.
Due to the X-ray use, your ban will last one week. It will expire Jan. 1, 2019, at around 7 p.m.
You can use this time to familiarize yourself with the server!