1. A method comprising: receiving data related to an individual, the data comprising a plurality of elements of personally-identifying information (PII); building a compositional key for the individual as a function of at least some elements of the plurality of elements of PII; storing the compositional key and a biometric print for the individual as a biometric record in a biometric repository; via the compositional key, providing a plurality of federated entity (FE) computer systems with access to the biometric repository; receiving a request for biometric verification of an unverified individual from an FE computer system, the request comprising a representation that the unverified individual has an assigned compositional key that is not known, the request comprising PII; building a candidate compositional key as a function of at least some elements of the PII from the request; identifying one or more compositional keys in the biometric repository that at least partially match the candidate compositional key; and verifying a biometric sample for the individual against a biometric print associated with each of the one or more compositional keys.