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Merkle tree for custom predicate batches (#471)

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Resolve https://github.com/0xPARC/pod2/issues/466

Now batches are identified by the root of a merkle tree that contains all the predicates (using sequential indices as keys).  This means that the format to identify a custom predicate reference is still a hash + index, but the calculation of the hash is different.
The MainPod circuit now isn't limited by number of batches but instead number of custom predicates; and for each one we verify a merkle proof to verify the batch id.

I've removed a bunch of tests from lang that were testing splitting into multiple batches because there's no longer any need for that.  In a future PR we'll remove the code that handles batch splitting.

Each custom predicate needs 148.2 gates (which is very close to my estimate of 142.7 in https://github.com/0xPARC/pod2/issues/466#issuecomment-3823531286 where I actually made a mistake and considered 5 predicates per batch instead of 4 in the previous Params).
This commit is contained in:
Eduard S. 2026-02-04 11:12:32 +01:00 • committed by GitHub
parent a7a30176a7
commit 641d8dabdd
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17 changed files with 331 additions and 761 deletions
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4
src/frontend/custom.rs
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@ -244,7 +244,7 @@ impl CustomPredicateBatchBuilder {
}
pub fn finish(self) -> Arc<CustomPredicateBatch> {
CustomPredicateBatch::new(&self.params, self.name, self.predicates)
CustomPredicateBatch::new(self.name, self.predicates)
}
}
@ -291,8 +291,6 @@ mod tests {
let eth_dos_batch_mw: middleware::CustomPredicateBatch =
Arc::unwrap_or_clone(eth_dos_batch);
let fields = eth_dos_batch_mw.to_fields();
println!("Batch b, serialized: {:?}", fields);
Ok(())
}