Image/Video/Audio/Text/Data Marketplace Website and App

A marketplace to allow users to upload and sell audio, video and images with high upload and download speeds. There need to be at least log in elements i.e one log in flow for users looking to sell, another for users and organizations to buy, post requests and another for Admin to manage the marketplace etc. Ideally we would want there to be different sell options including fixed price and auction and for the seller to have the option to sell the content and rights once or to sell multiple times. We would also require and option for buyers to post requests or challenges with ranges of prices. The site and application needs to be able to organize the content either through keywords or hashtags (would be interested in hearing other proposals for this). Through this we would want both buyers and sellers to set up and sign up for alerts for specific keywords and/ hashtags to alert them via e-mail and for the app via a push notification on their device. We would also want the sellers location to be captured and also enable alerts related to that. Users also needs to be able to add descriptions of the content loaded. In terms of payment methods, we would want traditional payment methods to be the main options (credit/debit/paypal etc) but would also like to understand if their are options to accept cryptocurrency payments as well. A majority of the content being bought and sold on the marketplace will be time sensitive so we would need to ensure that the solution is stable, can enable large file size uploads and downloads and can do this at high speeds with no impact to the quality of the content. the citizen app [login to view URL] is similar to what we are after in terms of look and feel and some elements of functionality. All relevant brand content etc would be provided by us and full ownership for the solution will be owned by us. This solution should be developed for us and not based on existing solutions unless you have provide assurance that this is the best way o achieve our goal. We would also like to understand the viability of this being a website, iOS app and Android app.