Providing online non-downloadable software for use in tracking proof of provenance and ownership of luxury or high value preowned goods and collectibles, including watches, cars, clothing, accessories, jewelry, handbags, cards, sports memorabilia, fine wine and spirits, art, antiques, and celebrity and musician owned goods; Providing online non-downloadable software for use in proving chain of custody; Providing online non-downloadable software for use in proving chain of custody using blockchain technology; Providing online non-downloadable software for providing digital certificate of authenticity; Providing online non-downloadable software for providing digital records of ownership for luxury or high value preowned goods and collectibles, including watches, cars, clothing, accessories, jewelry, handbags, cards, sports memorabilia, fine wine and spirits, art, antiques, and celebrity and musician owned goods; Providing online non-downloadable software for use in providing records of authenticity and ownership using blockchain technology; Providing online non-downloadable software for use in e-commerce transactions and websites; Providing online non-downloadable software for use in e-commerce transactions and websites for luxury goods and collectibles represented by non-fungible tokens (NFTs); Providing online non-downloadable software for use in tracking inventory, analytics, and sales of luxury good items and collectibles; Providing online non-downloadable software for use in tracking inventory, analytics, and sales of luxury good items and collectibles using blockchain technology; Providing online non-downloadable software for use in customer relationship management (CRM); Platform as a service (PAAS) featuring computer software platforms for use in connecting buyers and sellers of luxury good items and collectibles; Platform as a service (PAAS) featuring computer software platforms for use in connecting buyers and sellers of luxury or high value preowned goods and collectibles, including watches, cars, clothing, accessories, jewelry, handbags, cards, sports memorabilia, fine wine and spirits, art, antiques, and celebrity and musician owned goods represented by non-fungible tokens (NFTs); Computer services, namely, providing an online community for registered users to form virtual communities, engage in social networking, invite friends, share collections, and build community groups based on shared interests