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For a public one-way function $f()$, we can use zero proof to prove I know some secret $x$, such that the output of $x$ is a specific number $y$.

However, in zcash, I need to prove that I have some secret $x$, then $cm$ which is the commitment result of $x$ is a leaf in Merkle tree. Here, $cm$ is not a specific number and it is secret.

How should I prove this statement? I cannot figure out the circuit structure and the process using ZK-snark.

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