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I hear you very well The use case is a loterry where user can choose a number. At the end one of the numbers chosen by the users will be selected as the winning number At most one user per number (so uniqueness of bought numbers) A user can buy as many numbers as he wants I thought I would model the bought numbers as a nft collection and save on the contract storage only the list of numbers that have been chosen Is it clearer?
It's clearer now ? Thank you :) Might be my personal bias, but wouldn't just assigning the user an index be enough for your use case? I don't see the additional value of letting the users choose the number, unless you want to have either multiple winners or rounds with no winners at all ? The nft collection might be a nice gimmick though?