An NFT, an acronym for Non Fungible Token, is a contract made with Blockchain technology that guarantees the ownership, authenticity and exclusivity of the work in question. The difference between a book in NFT format and a book in digital format is that in the case of a book in NFT format, the book is the property of the person who acquires it, who can resell it at any time. In contrast, in the case of a digital book, the purchaser has the right to use the book, but not to resell it, as he does not own the asset. Similarly, the NFT book gives the buyer a unique book. In this case, each buyer can choose one of the 99 unique covers for sale.