Identity attributes bind to the Proof Engine through “proof templates”.

Example:

Template: AgeOver18
Input: birthdate attribute
Output: ZK proof (boolean true)

Templates define:

• required inputs
• allowed proof types
• validity periods
• allowed verifier roles

This allows:

• institutions to request proofs
• apps to verify them
• OS to control privacy and permissions

The Identity Layer and Proof Engine work together, but remain independent modules.