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We need a Script like: [login to view URL] How it works for seller: Seller upload files to server, specify his Bitcoin address and price Share link to the box to potential buyers Profit! How it works for the buyer: Buyer click the "buy" button He will get new unique address* for his payment only After sending his payment and network confirmation system will allow downloading files Amount with subtracted fee is sent to seller automatically. * there are two reasons why we generate new addresses instead of using seller address. Main reason is that we need to identify payment author (via pairing box url, generated address and buyer browser cookie) - we would not recognize who made the payment and who to allow download otherwise. Second reason is that it would be very simple to identify how many times was files actually sold just by searching in blockchain which is not desired for most of sellers.