How to validate a proving key and verification key are generated correctly in SNARKs?

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If Alice does the trusted setup, how does Bob validate the proving key and verification key are well formed, i.e., they are actually a pair derived from the said circuit and same toxic waste? Alice could run the setup twice and give Bob the proving key from the first run and verification key from the 2nd run, causing key mitmatch. Can Bob detect this kind of subversion in a SNARK such as Groth16?


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