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Blockchain technology is an emerging technology which is making a significant contribution to the ongoing digital evolution by influencing companies, business models and value creation. Since its invention, this technology was receiving great interest in different areas, starting from the financial one by also including the tourism sector. This work proposes the study of a software system, based on blockchain, to facilitate disintermediation in the tourism sector and promoting its sustainability simultaneously. The system is designed to take advantage of blockchain technology both to guarantee the security and reliability of the system, and to manage the roles and responsibilities of numerous types of actors. Thanks to the continuous collaboration of the all involved stakeholders, and to the data come from IoT devices, the system will be able to monitor a specific tourist destination by making use of ETIS indicators we specifically use for the assessment of sustainability into all aspects. The study also includes an overview of the barriers to blockchain adoption in tourism that can undermine the sustainability of the system.