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First of all, user data does not necessarily equal personal data and as long as you do not store personal data or something that falls under the GDPR on a public Blockchain you are ok. It's simple, let it be, don't store personal data on a public blockchain (note what the GDPR says, there are many different sources for pseudonymisation and anonymisation ...


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Without knowing the exact game logic I can't really answer your question but the following should at least show you how to nest objects. struct [[eosio::table]] user_t { struct card_skin_t { eosio::name name; uint8_t owned; } struct card_t { eosio::name card_name; eosio::name ...


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