BlockCore

BlockCore is a library that allows people to easily add custom blocks to their datapacks. The datapack does not do anything on its own, but rather must be used in combination with another datapack that adds the blocks. If you are downloading this datapack, it's probably because another datapack requires it, or you want to develop one of your own.

Thanks to Admin from WASDBuildTeam, who made the tutorial for the custom blocks engine that I based this off of.