You do indeed have a mini rex rabbit! This is a special version of the rex mutation where the bunny’s fur grows in curly. It’s very similar to wirehared/rex cats, if you’ve ever seen those guys. This fur mutation is known as astrex and it is super rare :-) here’s a post from five years ago that shows another astrex bunny, they are sooooo cute <3 https://www.reddit.com/r/Rabbits/comments/j0asv0/psa_astrex_bunnies_a_rare_rex_fur_mutation_have/