Best-fit and natural is to use the Assurance Framework that originated as collaborative work of R&E federations - the REFEDS Assurance suite https://wiki.refeds.org/display/ASS.

To ensure identifier uniqueness:

• https://refeds.org/assurance/ID/unique; or
• https://refeds.org/assurance/ID/eppn-unique-no-reassign

To ensure sufficient identity proofing and credential issuance, renewal, and replacement:

• https://refeds.org/assurance/IAP/medium; or
• https://refeds.org/assurance/IAP/high