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EUID (European Unique Identifier) is a European unique identifier that enables consistent referencing of a business, especially in cross-border contexts. Its goal is to reduce ambiguity caused by name variations, national formats, and differences between business registries by providing a common, machine-readable reference. In B2B exchanges, regulatory compliance, and traceability workflows, a stable and unambiguous identifier supports automation: data matching, identity checks, linking events to an actor, and reducing homonym errors. Within a digital identity ecosystem, EUID can be used as a verifiable attribute: an organization can prove it corresponds to a given EUID, and third-party systems can rely on it to connect status information, roles, authorizations, or proofs. This is particularly valuable when the same actor interacts with multiple partners across different countries, or when it is necessary to demonstrate that a statement (compliance, provenance, responsibility) genuinely comes from the relevant organization. In the Digital Product Passport (DPP) context, EUID helps uniquely identify the economic operators associated with a product: manufacturer, importer, distributor, repairer, and others. It strengthens the information chain by enabling events (manufacturing, inspections, repairs, recycling) to be reliably linked to the responsible actor and reused for controls or audits. Combined with the EU Business Wallet (EBW) and Verifiable Credentials, EUID becomes a building block for a portable, verifiable business identity. In short, EUID is a key interoperability component: it simplifies organizational identification, strengthens trust, and enables better automation of cross-border processes.