Downloadable digital files authenticated by non-fungible tokens [NFTs] representing articles made of leather and imitations of leather, coin purses, wallets, card holders, rucksacks, handbags, bumbags, school bags, bags for campers, beach bags, sports bags, traveling bags, suitcases, luggage, shoe bags, toilet bags, umbrellas, parasols, clothing, sportswear, tracksuits, shorts, trousers, skirts, shirts, short-sleeve shirts, t-shirts, knitwear, jumpers, polo shirts, jackets, parkas, blousons, sweatshirts, underwear, shoes, socks, sports shoes, hats, caps, visors, headbands, wristbands, bonnets, gloves, sashes for wear, bathing suits, sports equipment, sports articles, balls for games, tennis balls, balls for racket games, guts for rackets, tennis racket strings, racket strings, natural gut strings for tennis rackets, synthetic strings for rackets, gut strings for rackets, cases adapted for sports articles, racket cases, fitted covers for tennis rackets, covers designed for sports articles, protective covers for rackets, racket covers, tennis racket covers, stringing materials for sports racquets, wrist protectors for athletic use, rackets, tennis rackets, pre-shaped tennis bags for rackets, vibration dampers for tennis rackets, grip tapes for tennis rackets, boxes for tennis balls, for use in a virtual environment [metaverse].;