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This paper positions blockchain systems in the context of smart city policy. It argues that blockchain technology may be an effective vehicle in coping with corruption and 'false playing' in urban public procurement and tendering systems. It presents the design of new app (Self-Sovereign App or SSApp) to avoid corruptive behavior of agents.doi:10.5194/isprs-archives-xliv-4-w2-2020-9-2020 doaj:731442ee69cf483eba6a4c809da0ed29 fatcat:tay4folclrhqvbxvw4asixwbba