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Blockchain technology in the tourism industry: Bibliometric analysis

dc.contributor.authorTopsakal, Yunus
dc.contributor.authorDinç, Abdurrahman
dc.date.accessioned2026-06-26T07:10:37Z
dc.date.available2026-06-26T07:10:37Z
dc.date.issued2026-06-08
dc.identifier.issn0867-5856
dc.identifier.urihttp://hdl.handle.net/11089/58659
dc.description.abstractThis study seeks to provide a comprehensive overview of the current body of literature on blockchain technology within the tourism industry and bridge the existing research gap in this area. We searched the Web of Science Core Collection using the topic field with the keywords “blockchain” or “block chain” combined with “tourism”. The search covered titles, abstracts, author keywords and KeyWords Plus, and was refined by using the “hospitality, leisure, sport & tourism” category and documents in English only. After relevance screening based on titles, abstracts and author keywords, 118 documents were included in the analysis. Descriptive and keyword co-occurrence analyses were conducted using VOSviewer. The first publication on blockchains in tourism appeared in 2018, followed by a gradual increase in scholarly output. The results show that blockchain-related tourism research has grown rapidly in recent years but remains fragmented, with publication activity concentrated in a limited number of technology-oriented journals but with weak collaboration across authors, institutions and countries. Taken together, these findings indicate an expanding yet still unconsolidated research field shaped by emerging academic attention rather than mature research integration.en
dc.language.isoen
dc.publisherWydawnictwo Uniwersytetu Łódzkiegopl
dc.relation.ispartofseriesTuryzm/Tourism;1en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0
dc.subjectblockchainen
dc.subjecttourism industryen
dc.subjectacademic mappingen
dc.subjectbibliometric analysisen
dc.titleBlockchain technology in the tourism industry: Bibliometric analysisen
dc.typeArticle
dc.page.number113-125
dc.contributor.authorAffiliationTopsakal, Yunus - Malatya Turgut Ozal University (Malatya, Türkiye), Department of Tourism Managementen
dc.contributor.authorAffiliationDinç, Abdurrahman - Necmettin Erbakan University (Konya, Türkiye), Tourism Facultyen
dc.identifier.eissn2080-6922
dc.referencesAlansari, S. (2020). A blockchain-based approach for secure, transparent and accountable personal data sharing [Doctoral thesis, University of Southampton]. University of Southampton Institutional Repository. http://eprints.soton.ac.uk/id/eprint/447633en
dc.referencesAlhejaili, M.O.M. (2025). Integrating smart contracts into the legal framework of Saudi Arabia. International Journal of Law and Management, 67(2), 230–248. https://doi.org/10.1108/IJLMA-03-2024-0086en
dc.referencesArici, H.E., Aydin, C., Koseoglu, M.A., & Sökmen, A. (2023). Sports tourism research: A bibliometric analysis and agenda for further inquiry. Tourism and Hospitality Research, 25(3), 406–420. Advance online publication. https://doi.org/10.1177/14673584231218106en
dc.referencesBakhshaliyeva, A. (2023). The value of blockchain in the hospitality industry [Master’s thesis, Masaryk University]. Informační systém Masarykovy university / The Information System of Masaryk University. https://is.muni.cz/th/sy6us/Aysel_Final_thesis_14.pdfen
dc.referencesBanerji, D., Rashideh, W., Arora, B., & Pratihari, A.R. (2021). Application potential of blockchain technologies in the travel and tourism industry. In T. Choudhury, A. Khanna, T.T. Toe, M. Khurana & N.G. Nhu (Eds.), Blockchain applications in IoT ecosystem (pp. 289–299). Springer. https://doi.org/10.1007/978-3-030-65691-1_19en
dc.referencesBenckendorff, P., & Zehrer, A. (2013). A network analysis of tourism research. Annals of Tourism Research, 43, 121–149. https://doi.org/10.1016/j.annals.2013.04.005en
dc.referencesCentobelli, P., Cerchione, R., Del Vecchio, P., Oropallo, E., & Secundo, G. (2022). Blockchain technology for bridging trust, traceability and transparency in circular supply chain. Information & Management, 59(7), Article 103508. https://doi.org/10.1016/j.im.2021.103508en
dc.referencesChondrogiannis, E., Andronikou, V., Karanastasis, E., Litke, A., & Varvarigou, T. (2022). Using blockchain and semantic web technologies for the implementation of smart contracts between individuals and health insurance organizations. Blockchain: Research and Applications, 3(2), Article 100049. https://doi.org/10.1016/j.bcra.2021.100049en
dc.referencesCoita, D.C., & Ban, O. (2020). Revolutionizing marketing in tourism industry through blockchain technology. In A. Kavoura, E. Kefallonitis & P. Theodoridis (Eds.), Strategic innovative marketing and tourism (pp. 789–797). Springer. https://doi.org/10.1007/978-3-030-36126-6_87en
dc.referencesDemirel, E., Karagöz Zeren, S., & Hakan, K. (2022). Smart contracts in tourism industry: A model with blockchain integration for post-pandemic economy. Current Issues in Tourism, 25(12), 1895–1909. https://doi.org/10.1080/13683500.2021.1960280en
dc.referencesDhiraj, A., Kumar, S., Rani, D., Grima, S., & Sood, K. (2023). Blockchain payment services in the hospitality sector: The mediating role of data security on utilization efficiency of the customer. Data, 8(8), Article 123. https://doi.org/10.3390/data8080123en
dc.referencesDi Vaio, A., & Varriale, L. (2020). Blockchain technology in supply chain management for sustainable performance: Evidence from the airport industry. International Journal of Information Management, 52, Article 102014. https://doi.org/10.1016/j.ijinfomgt.2019.09.010en
dc.referencesDong, N., Bai, G., Huang, L.C., Lim, E.K.H., & Dong, J.S. (2020). A blockchain-based decentralized booking system. The Knowledge Engineering Review, 35, Article e17. https://doi.org/10.1017/S0269888920000260en
dc.referencesDutta, P., Choi, T.-M., Somani, S., & Butala, R. (2020). Blockchain technology in supply chain operations: Applications, challenges and research opportunities. Transportation Research Part E: Logistics and Transportation Review, 142, Article 102067. https://doi.org/10.1016/j.tre.2020.102067en
dc.referencesEchchakoui, S. (2020). Why and how to merge Scopus and Web of Science during bibliometric analysis: The case of sales force literature from 1912 to 2019. Journal of Marketing Analytics, 8(3–4), 165–184. https://doi.org/10.1057/s41270-020-00081-9en
dc.referencesFaustino, S., Faria, I., & Marques, R. (2022). The myths and legends of king Satoshi and the knights of blockchain. Journal of Cultural Economy, 15(1), 67–80. https://doi.org/10.1080/17530350.2021.1921830en
dc.referencesFilimonau, V., & Naumova, E. (2020). The blockchain technology and the scope of its application in hospitality operations. International Journal of Hospitality Management, 87(5), Article 102383. https://doi.org/10.1016/j.ijhm.2019.102383en
dc.referencesGarcía-Lillo, F., Seva-Larrosa, P., & Sánchez-García, E. (2023). What is going on in entrepreneurship research? A bibliometric and SNA analysis. Journal of Business Research, 158, Article 113624. https://doi.org/10.1016/j.jbusres.2022.113624en
dc.referencesGarg, P., Gupta, B., Chauhan, A.K., Sivarajah, U., Gupta, S., & Modgil, S. (2021). Measuring the perceived benefits of implementing blockchain technology in the banking sector. Technological Forecasting and Social Change, 163, Article 120407. https://doi.org/10.1016/j.techfore.2020.120407en
dc.referencesGatteschi, V., Lamberti, F., Demartini, C., Pranteda, C., & Santamaría, V. (2018). Blockchain and smart contracts for insurance: Is the technology mature enough? Future Internet, 10(2), Article 20. https://doi.org/10.3390/fi10020020en
dc.referencesGorkhali, A., Li, L., & Shrestha, A. (2020). Blockchain: A literature review. Journal of Management Analytics, 7(3), 321–343. https://doi.org/10.1080/23270012.2020.1801529en
dc.referencesHabib, G., Sharma, S., Ibrahim, S., Ahmad, I., Qureshi, S., & Ishfaq, M. (2022). Blockchain technology: Benefits, challenges, applications, and integration of blockchain technology with cloud computing. Future Internet, 14(11), Article 341. https://doi.org/10.3390/fi14110341en
dc.referencesHalkiopoulos, C., Antonopoulou, H., & Kostopoulos, N. (2022). Integration of blockchain technology in tourism industry: Opportunities and challenges. In V. Katsoni (Ed.), Tourism, Travel, and Hospitality in a Smart and Sustainable World 9th International Conference, IACuDiT, Syros, Greece, 2022: Vol. 1 (pp. 353–368). Springer International Publishing. https://doi.org/10.1007/978-3-031-26829-8_22en
dc.referencesHariguna, T., Durachman, Y., Yusup, M., & Millah, S. (2021). Blockchain technology transformation in advancing future change. Blockchain Frontier Technology, 1(1), 13–20. https://doi.org/10.34306/bfront.v1i01.4en
dc.referencesHarzing, A.-W., & Alakangas, S. (2016). Google Scholar, Scopus and the Web of Science: A longitudinal and cross-disciplinary comparison. Scientometrics, 106(11), 787–804. https://doi.org/10.1007/s11192-015-1798-9en
dc.referencesHashemi Joo, M., Nishikawa, Y., & Dandapani, K. (2020). Cryptocurrency, a successful application of blockchain technology. Managerial Finance, 46(6), 715–733. https://doi.org/10.1108/MF-09-2018-0451en
dc.referencesIrannezhad, E., & Mahadevan, R. (2021). Is blockchain tourism’s new hope? Journal of Hospitality and Tourism Technology, 12(1), 85–96. https://doi.org/10.1108/JHTT-02-2019-0039en
dc.referencesJabeur, S.B., Ballouk, H., Arfi, W.B., & Sahut, J.-M. (2023). Artificial intelligence applications in fake review detection: Bibliometric analysis and future avenues for research. Journal of Business Research, 158, Article 113631. https://doi.org/10.1016/j.jbusres.2022.113631en
dc.referencesJia-lan, L., Xiao-yu, W., Wan-jun, Y., Zi-chen, W.A., Huai-lin, Z.H., & Nai-meng, C.A. (2019). Research and design of travel insurance system based on blockchain. In 2019 International Conference on Intelligent Informatics and Biomedical Sciences (ICIIBMS) (pp. 121–124). IEEE. https://doi.org/10.1109/ICIIBMS46890.2019.8991444en
dc.referencesJiang, Y., Tran, T.H., & Williams, L. (2023). A surveillance-and-blockchain-based tracking system for mitigation of baggage mishandling at smart airports. Journal of Airline Operations and Aviation Management, 2(2), 33–51. https://www.jaoam.com/index.php/jaoam/article/view/55en
dc.referencesKalia, P., Mladenović, D., & Acevedo-Duque, A. (2022). Decoding the trends and the emerging research directions of digital tourism in the last three decades: A bibliometric analysis. SAGE Open, 12(4), 1–23. https://doi.org/10.1177/21582440221128179en
dc.referencesKarim, R.A., Rabiul, M.K., Ishrat, M., Promsivapallop, P., & Kawser, S. (2023). Can blockchain payment services influence customers’ loyalty intention in the hospitality industry? A mediation assessment. Administrative Sciences, 13(3), Article 85. https://doi.org/10.3390/admsci13030085en
dc.referencesKassen, M. (2022). Blockchain and e-government innovation: Automation of public information processes. Information Systems, 103, Article 101862. https://doi.org/10.1016/j.is.2021.101862en
dc.referencesKhan, H.M.R., Ahmad, S., Javed, R., & Nasir, N. (2023). The significance of artificial intelligence in business and accounting: A bibliometric analysis. Pakistan Journal of Humanities & Social Sciences, 11(2), 1061–1082. https://journals.internationalrasd.org/index.php/pjhss/article/view/1332en
dc.referencesKhan, S.N., Loukil, F., Ghedira-Guegan, C., Benkhelifa, E., & Bani-Hani, A. (2021). Blockchain smart contracts: Applications, challenges, and future trends. Peer-to-Peer Networking and Applications, 14, 2901–2925. https://doi.org/10.1007/s12083-021-01127-0en
dc.referencesKomalavalli, C., Saxena, D., & Laroiya, C. (2020). Overview of blockchain technology concepts. In S. Krishnan, V.E. Balas, E.G. Julie, Y.H. Robinson, S. Balaji & R. Kumar (Eds.), Handbook of research on blockchain technology (pp. 349–371). Academic Press. https://doi.org/10.1016/B978-0-12-819816-2.00014-9en
dc.referencesKuperberg, M. (2019). Blockchain-based identity management: A survey from the enterprise and ecosystem perspective. IEEE Transactions on Engineering Management, 67(4), 1008–1027. https://doi.org/10.1109/TEM.2019.2926471en
dc.referencesKwok, A.O., & Koh, S.G. (2019). Is blockchain technology a watershed for tourism development? Current Issues in Tourism, 22(20), 2447–2452. https://doi.org/10.1080/13683500.2018.1513460en
dc.referencesLavanya, M., & Kavitha, V. (2022). Secure tamper-resistant electronic health record transaction in cloud system via blockchain. Wireless Personal Communications, 124(1), 607–632. https://doi.org/10.1007/s11277-021-09374-3en
dc.referencesLe, A.T., & Nguyen, H.S. (2023). Ecotourism research progress: A bibliometric analysis (period 2002–2022) using VOSviewer Software. Turyzm/Tourism, 33(2), 71–81. https://doi.org/10.18778/0867-5856.33.2.06en
dc.referencesLee, K.L., & Zhang, T. (2023). Revolutionizing supply chains: Unveiling the power of blockchain technology for enhanced transparency and performance. International Journal of Technology, Innovation and Management (IJTIM), 3(1), 19–27. https://doi.org/10.54489/ijtim.v3i1.216en
dc.referencesLi, J., He, Q., Liang, R., & Jiang, B. (2021). Smart tourism identity authentication service based on blockchain and decentralized identifier. In H.-N. Dai, X. Liu, D.X. Luo, J. Xiao & X. Chen (Eds.), Blockchain and trustworthy systems: Third International Conference, BlockSys 2021, Guangzhou, China, August 5–6, 2021: Revised selected papers (pp. 545–558). Springer. https://doi.org/10.1007/978-981-16-7993-3_42en
dc.referencesLine, N.D., Dogru, T., El-Manstrly, D., Buoye, A., Malthouse, E., & Kandampully, J. (2020). Control, use and ownership of big data: A reciprocal view of customer big data value in the hospitality and tourism industry. Tourism Management, 80, Article 104106. https://doi.org/10.1016/j.tourman.2020.104106en
dc.referencesLiu, Y., He, D., Obaidat, M.S., Kumar, N., Khan, M.K., & Choo, K.-K.R. (2020). Blockchain-based identity management systems: A review. Journal of Network and Computer Applications, 166, Article 102731. https://doi.org/10.1016/j.jnca.2020.102731en
dc.referencesLoukil, F., Boukadi, K., Hussain, R., & Abed, M. (2021). CioSy: A collaborative blockchain-based insurance system. Electronics, 10(11), Article 1343. https://doi.org/10.3390/electronics10111343en
dc.referencesMadhani, P.M. (2022). Effective marketing strategy with blockchain implementation: Enhancing customer value propositions. IUP Journal of Business Strategy, 19(1), 7–35.en
dc.referencesMohammad Saif, A.N., & Islam, A.M. (2024). Blockchain in human resource management: A systematic review and bibliometric analysis. Technology Analysis & Strategic Management, 36(4), 635–650. https://doi.org/10.1080/09537325.2022.2049226en
dc.referencesMohanan, M., & Shekhar, S.K. (2022). Bibliometric analysis of publications on wellness tourism. Turyzm/Tourism, 32(2), 69–86. https://doi.org/10.18778/0867-5856.32.2.04en
dc.referencesNakamoto, S. (2008, October 31). Bitcoin: A peer-to-peer electronic cash system. Nakamoto Institute. https://nakamotoinstitute.org/library/bitcoin/en
dc.referencesNyauma, G.G., & Manjula, V.S. (2023). Revolutionizing legal and business processes of the digital age using blockchain technology. Journal of Applied Science, Information and Computing, 4(1), 43–54. https://doi.org/10.59568/JASIC-2023-4-1-05en
dc.referencesParate, S., Josyula, H.P., & Reddi, L.T. (2023). Digital identity verification: Transforming KYC processes in banking through advanced technology and enhanced security measures. International Research Journal of Modernization in Engineering Technology and Science, 05(09), 128–137. https://www.doi.org/10.56726/IRJMETS44476en
dc.referencesPradhan, B., Roy, M., & Bhatia, S. (2023). Enhancing tourists’ satisfaction through blockchain technology. PUSA Journal of Hospitality and Applied Sciences, 9(2), 37–47. https://doi.org/10.48165/pjhas.2023.9.2.5en
dc.referencesRabby, F., Chimhundu, R., & Hassan, R. (2022). Blockchain technology transforms digital marketing by growing consumer trust. In S.M. Idrees & M. Nowostawski (Eds.), Transformations through blockchain technology: The new digital revolution (pp. 265–289). Springer. https://doi.org/10.1007/978-3-030-93344-9_12en
dc.referencesRahman, F., Titouna, C., & Nait-Abdesselam, F. (2025). Fundamentals of blockchain and smart contracts. In N. El Madhoun, I. Dionysiou & E. Bertin (Eds.), Blockchain and smart-contract technologies for innovative applications (pp. 3–37). Springer. https://doi.org/10.1007/978-3-031-50028-2_1en
dc.referencesRaluca-Florentina, T. (2022). The utility of blockchain technology in the electronic commerce of tourism services: An exploratory study on Romanian consumers. Sustainability, 14(2), Article 943. https://doi.org/10.3390/su14020943en
dc.referencesRana, R.L., Adamashvili, N., & Tricase, C. (2022). The impact of blockchain technology adoption on tourism industry: A systematic literature review. Sustainability, 14(12), Article 7383. https://doi.org/10.3390/su14127383en
dc.referencesRashideh, W. (2020). Blockchain technology framework: Current and future perspectives for the tourism industry. Tourism Management, 80, Article 104125. https://doi.org/10.1016/j.tourman.2020.104125en
dc.referencesRejeb, A., Keogh, J.G., & Treiblmaier, H. (2020). How blockchain technology can benefit marketing: Six pending research areas. Frontiers in Blockchain: Section Blockchain for Web3 and the Metaverse, 3, Article 3. https://doi.org/10.3389/fbloc.2020.00003en
dc.referencesRejeb, A., Rejeb, K., Simske, S., & Treiblmaier, H. (2021a). Blockchain technologies in logistics and supply chain management: A bibliometric review. Logistics, 5(4), Article 72. https://doi.org/10.3390/logistics5040072en
dc.referencesRejeb, A., Rejeb, K., Simske, S.J., & Keogh, J.G. (2021b). Blockchain technology in the smart city: A bibliometric review. Quality & Quantity, 56, 2875–2906. https://doi.org/10.1007/s11135-021-01251-2en
dc.referencesRoman, M., & Kawęcki, N. (2024). Agritourism in academic research: Literature review and cluster analysis. Turyzm/Tourism, 34(1), 45–55. https://doi.org/10.18778/0867-5856.34.1.04en
dc.referencesRomano, D., & Schmid, G. (2021). Beyond bitcoin: Recent trends and perspectives in distributed ledger technology. Cryptography, 5(4), Article 36. https://doi.org/10.3390/cryptography5040036en
dc.referencesSarmah, S.S. (2018). Understanding blockchain technology. Computer Science and Engineering, 8(2), 23–29. http://article.sapub.org/10.5923.j.computer.20180802.02.htmlen
dc.referencesSebastião, H.M., Cunha, P., & Godinho, P.M.C. (2021). Cryptocurrencies and blockchain: Overview and future perspectives. International Journal of Economics and Business Research, 21(3), 305–342. https://doi.org/10.1504/IJEBR.2021.114400en
dc.referencesShamshad, S., Minahil, Mahmood, K., Kumari, S., & Chen, C.M. (2020). A secure blockchain-based e-health records storage and sharing scheme. Journal of Information Security and Applications, 55, Article 102590. https://doi.org/10.1016/j.jisa.2020.102590en
dc.referencesShetty, A., Shetty, A.D., Pai, R.Y., Rao, R.R., Bhandary, R., Shetty, J., & Dsouza, K.J. (2022). Blockchain application in insurance services: A systematic review of the evidence. SAGE Open, 12(1). https://doi.org/10.1177/21582440221079877en
dc.referencesSousa, A., Calçada, E., Rodrigues, P., & Pinto Borges, A. (2022). Cryptocurrency adoption: A systematic literature review and bibliometric analysis. EuroMed Journal of Business, 17(3), 374–390. https://doi.org/10.1108/EMJB-01-2022-0003en
dc.referencesTandon, A., Kaur, P., Mäntymäki, M., & Dhir, A. (2021). Blockchain applications in management: A bibliometric analysis and literature review. Technological Forecasting and Social Change, 166, Article 120649. https://doi.org/10.1016/j.techfore.2021.120649en
dc.referencesTham, A., & Sigala, M. (2020). Road block(chain): Bit(coin)s for tourism sustainable development goals? Journal of Hospitality and Tourism Technology, 11(2), 203–222. https://doi.org/10.1108/JHTT-05-2019-0069en
dc.referencesThees, H., Erschbamer, G., & Pechlaner, H. (2020). The application of blockchain in tourism: Use cases in the tourism value system. European Journal of Tourism Research, 26, Article 2602. https://doi.org/10.54055/ejtr.v26i.1933en
dc.referencesTimuçin, T., & Biroğul, S. (2021). A survey: Making “Smart Contracts” really smart. Transactions on Emerging Telecommunications Technologies, 32(11), Article e4338. https://doi.org/10.1002/ett.4338en
dc.referencesTyan, I., Guevara-Plaza, A., & Yagüe, M.I. (2021). The benefits of blockchain technology for medical tourism. Sustainability, 13(22), Article 12448. https://doi.org/10.3390/su132212448en
dc.referencesUtz, M., Johanning, S., Roth, T., Bruckner, T., & Strüker, J. (2023). From ambivalence to trust: Using blockchain in customer loyalty programs. International Journal of Information Management, 68, Article 102496. https://doi.org/10.1016/j.ijinfomgt.2022.102496en
dc.referencesWang, L., Luo, X.(R.)., & Lee, F. (2019). Unveiling the interplay between blockchain and loyalty program participation: A qualitative approach based on Bubichain. International Journal of Information Management, 49, 397–410. https://doi.org/10.1016/j.ijinfomgt.2019.08.001en
dc.referencesWasiq, M., Bashar, A., Akmal, S., Rabbani, M.R., Saifi, M.A., Nawaz, N., & Nasef, Y.T. (2023). Adoption and applications of blockchain technology in marketing: A retrospective overview and bibliometric analysis. Sustainability, 15(4), Article 3279. https://doi.org/10.3390/su15043279en
dc.referencesZarrin, J., Wen Phang, H., Babu Saheer, L., & Zarrin, B. (2021). Blockchain for decentralization of internet: Prospects, trends, and challenges. Cluster Computing, 24(4), 2841–2866. https://doi.org/10.1007/s10586-021-03301-8en
dc.referencesZeng, S.Q., Huo, R., Huang, T., Liu, J., Wang, S., & Feng, W. (2020). Survey of blockchain: Principle, progress and application. Tongxin xuebao / Journal on Communications, 41(1), 134–151 [in Chinese]. https://www.joconline.com.cn/zh/article/doi/10.11959/j.issn.1000-436x.2020027/en
dc.referencesZhou, L., Diro, A., Saini, A., Kaisar, S., & Hiep, P.C. (2024). Leveraging zero knowledge proofs for blockchain-based identity sharing: A survey of advancements, challenges and opportunities. Journal of Information Security and Applications, 80, Article 103678. https://doi.org/10.1016/j.jisa.2023.103678en
dc.referencesZupic, I., & Čater, T. (2015). Bibliometric methods in management and organization. Organizational Research Methods, 18(3), 429–472. https://doi.org/10.1177/1094428114562629en
dc.contributor.authorEmailTopsakal, Yunus - topsakal.yunus@gmail.com
dc.contributor.authorEmailDinç, Abdurrahman - a.dinc@erbakan.edu.tr
dc.identifier.doi10.18778/0867-5856.2026.09
dc.relation.volume36


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