About: http://webisa.webdatacommons.org/99197454

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I would not rely on the biometrics to be "stable across each authentication as you describe - at least, not without storing some sort of data (which goes directly against your proposal) they can be validated against.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com