This poster presents the first practical results of the FinFAIR project funded through the ECHOES Cascading Grants programme. As one of the first selected initiatives delivering structured Heritage Digital Twins to the emerging European Collaborative Cloud for Cultural Heritage, we demonstrate how small-scale, multilingual heritage ecosystems can integrate into European digital infrastructures without losing institutional autonomy or cultural specificity.

The Finno-Ugric Data Sharing Space is a federated public–private semantic infrastructure built with Wikibase and aligned with the European Interoperability Framework. Rather than centralising collections, it connects library, museum, archival, and field research workflows into a shared interoperability layer. Heterogeneous metadata (MARC/DCTERMS, CIDOC CRM, archival finding aids) is reconciled through identifier alignment (ISNI, VIAF, GeoNames), multilingual modelling for agglutinative languages, and component-based digital twin structures linking tangible and intangible heritage.

The DSS serves as a staging environment for ECCCH while increasing community visibility through selective synchronisation with Wikimedia Commons, Wikidata, and Wikipedia. A Livonian music case study shows how fragmented archival recordings were transformed into interoperable digital twins capable of modelling layered rights regimes, including author, performer, moral, personal data protection, and CARE considerations.

Beyond technical integration, the project incorporates cross-border reconciliation and community validation, demonstrating how governance-aware modelling enables epistemic restitution alongside interoperability.