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BlindedElement -> (BlindedEvaluation, ZKProof)
Evaluate a pseudorandom function on a blinded input, producing a blinded evaluation alongside a zero-knowledge proof of correct computation.
Problem it solves
Evaluating a secret-keyed function on client data without the client revealing their input and without the server being able to lie about its key usage.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.