Ćirić, Z. et al. Implementation of blockchain technology in the smart city Serbian Journal of Engineering Management Vol. 5, No. 1, 2020 50 Review Scientific Paper/Pregledni naučni rad UDC/UDK: 71:004.6 Paper Accepted/Rad prihvaćen: 13. 1. 2020. doi: 10.5937/SJEM2001050C Implementacija blokčejn tehnologija u pametnom gradu Zoran Ćirić 1 , Otilija Sedlak 1 , Stojan Ivanišević 2 1 Faculty of Economics Subotica, zoran.ciric@ef.uns.ac.rs 1 Faculty of Economics Subotica, otilija.sedlak@ef.uns.ac.rs 2 JKP Informatika Novi Sad, ivanisevicstojan@gmail.com Apstrakt: Ovaj rad predstavlja pokušaj da se ustanove smernice za implementaciju projekata informacionih sistema koji su zasnovani na blokčejn tehnologiji u pametnom gradu u cilju iskorićavanje prednosti ove tehnologije za povećanje stepena sigurnosti i održivosti. Iako su dostupni naučni izvori retki, ovaj rad pokušava da slabe tačke infrmacionih sistema u pametnim gradovima uporedi sa prednostima blokčejn tehnologije kako bi se ponudio potencijalno rešenje za slabosti i unapre dio informacione sisteme u pametnim gradovima, a samim tim i nivo održivosti. Ovo istraživanje samo pokazuje potrebu za implementacijom ovih tehnologija kao potencijalnom rešenju i razmatra dalje istraživanje koje je neophodno kako bi se ustanovio radni okvir za implementaciju blokčejn tehnologija u pametnim gradovima. Ključne reči: Blokčejn, Pametan grad, Upravljanje projektima, Informacioni sistemi, Održivi razvoj Implementation of blockchain technology in the smart city Abstract: This document presents an attempt to determine guidelines for the implementation of the blockchain projects within smart city (SC) information systems (IS) to improve their security and sustainability through harnessing benefits of blockchain technology. Aldo available scientific sources are scarce a review of contemporary scientific literature and other available sources attempts to determine weaknesses of current IS within SC and to compare their vs. benefits of the blockchain technology in order to show that blockchain technology can offer potential solution to weaknesses and improve SC IS and therefore the sustainability of the SC itself. However, this research only shows the need for such implementations and discusses what further research is required to provide a framework for the implementation of blockchain technology in smart cities. Keywords: Blockchain, smart city, project management, information systems, sustainability 1. Introduction This paper elaborates downsides of IS within SC found within the scientific literature and the promise delivered by the blockchain technology to solve them. In the brief review of most common problems and limitations of ICT within SC and a brief review of strongpoints of blockchain technology, a synthesis is attempted. This synthesis shows that there is a possibility that blockchain technologies can improve IS security, privacy and network availability — furthermore the scientific. Accepting blockchain technologies and exploring ways to apply these technologies to addressing challenges in smart cities is a research direction and represents a new area that has not been sufficiently explored through the prism of scientific research because blockchain technologies were recently adopted with creation of Ethereum Enterprise Alliance in 2017. (htt) The result of the research in this paper is to show the possibility for improvement of IS within SC with the application of blockchain technology and to search for a scientific founded framework for the implementation of blockchain technologies. There are strong indications that the application of blockchain technologies improves existing systems based on automatic data processing while ensuring increased security, transparency and easier participation of a large number of actors, regardless of whether they are natural or legal persons (see literature review in chapter 2.). Although the term Information Systems in Smart Cities marks a very broad term, this research refers to software solutions in smart cities that are related to e-government and fields of application of blockchain technology: payments, infrastructure for payment and exchange, smart