The main objective of this deliverable, aside from explaining the DUNS conceptualization and development process, is to demonstrate how this service can be integrated and useful in other Cos4Cloud services, such as Cos4Bio (a service that integrates biodiversity observations from multiple COs in one place). We also want to show how DUNS can provide an additional data flow to a citizen science portal such as Natusfera, enriching the portal's information with the goal of improving the community and retaining the people who are part of it and who contribute information with their observations. It is important to note that DUNS is a service that will be available on the EOSC Portal at https://marketplace.eosc-portal.eu/services/. The objective is that DUNS could be integrated into all Citizen Observatories that want to be part of Cos4Bio, and in this way they can receive notifications of use of each and every observation that experts download and use on other platforms through Cos4Bio. Deliverable related to DUNS service.