Identity Proofing Services is Services that verify people’s identities before issuing them accounts and credentials. Such proofing is based on “life history” or transaction information aggregated from public and proprietary data sources.
These Identity Proofing Services can also be used as an additional interactive user authentication method, especially for risky transactions. Identity-proofing services are typically used when accounts are provisioned over the Web or in a call center. However, they can also be used in face-to-face interactions.
Ref.: http://www.gartner.com/it-glossary/identity-proofing-services/