iDin is a bank-based identity and age-verification scheme operated by the Dutch banking sector, letting users confirm their identity or age through their existing online-banking login rather than uploading ID documents to a third party. For operators serving Dutch audiences, the appeal is conversion and trust: users authenticate through a channel they already know, and no identity documents change hands with the website itself.

The service returns only the attributes a site requests - an over-18 confirmation, for example - without exposing the full underlying identity, which aligns well with data-minimisation expectations. Coverage is concentrated in the Netherlands, so it functions best as a regional verification layer rather than a global solution, and operators with international audiences will need to pair it with a broader provider.

Best for operators with significant Dutch traffic who want a high-trust, document-free age-assurance option that leverages existing bank relationships.