Add Value Commitment operator #125
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volodymyr-basiuk
approved these changes
Feb 23, 2024
vmidyllic
reviewed
Feb 26, 2024
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| signal isNonceZero <== IsZero()(commitNonce); | ||
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| signal commit <== Poseidon(2)([value, commitNonce]); |
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Looks like I can receive the same commitment if I have another field with the same value and provide the same commitment outside. (I want to prove that I have the same date of birth in the different creds, but I can hack and prove that some another date that I have in other credential is equal to expected, but it is not the same meaning.
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It's not a hack. Maybe user wants to prove to verifier that on his day of birth there was a sun eclipse. It's ok.
We don't have a way to check meaning of fields and we shouldn't. User needs to check what verifier asks from him - does it make sense.
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Value Commitment allows to commit to a specific value and then reveal it later or use such a commitment in another circuits to prove that multiple circuits work with the same value without revealing it.
Todo: