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In general, I think of zk-SNARK circuits representing a language in NP, meaning it is "computationally easy" to verify. However I was reading about a recent zk-SNARK (Sonic) which has as goal "to provide zero-knowledge arguments for the satisfiability of constraint systems representing NP-hard languages".

Can someone explain how a zk-SNARK circuit can prove satisfiability of an NP-hard language?

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