Crypto Collectible Box?

Assalamualykum, I’d like to ask a quite complex question and I hope I can get a detailed answer.

I am writing some code to develop a digital collectible project (NFTs) where there are 5,000 available. We will automatically generate 120K artworks beforehand and then associate rarities to them like… (common, uncommon, rare). However, when you decide to purchase our collectible, you are subject to receiving 1 thing only — a coin. You can keep this coin or you can choose to redeem it for 24 different artworks that may vary in rarity.

I’d like to ask, is this classified as haram even though it’s a set object you purchase?