Actually Buuuddy banned me. The only mod I have is Optifine. Appealed and it got denied.I think you're banned by Sentinel so just appeal and mention what you did (in details, so if you walked or jumped) before you got banned and say which mods you use. There are some mods which aren't allowed on CubeCraft, here is a list of allowed Mods on CubeCraft > https://www.cubecraft.net/threads/list-of-allowed-mods.122155/.
If you appeal gets denied, contact a Developer or a Moderator and ask why your appeal got denied.
Good luck with appealing.
Contact @Buuuddy and ask why it got denied.Actually Buuuddy banned me. The only mod I have is Optifine. Appealed and it got denied.