I think homomorphic encryption through a third party would be better. Gov app could be one side of it, blinded evidence provision to the identity, to the interm

I think homomorphic encryption through a third party would be better. Gov app could be one side of it, blinded evidence provision to the identity, to the intermediary. Maybe this is what you meant? it's what the CSIRO and the Privacy Commissioner said was their recommended method to do proofs of age/identity through government issued documents, without revealing what the URL was being accessed.