pub fn root_info(&self, l1_batch_number: L1BatchNumber) -> Option<(ValueHash, u64)> {
        let root = self.0.root(l1_batch_number.0.into())?;
        Some((root.hash(&Blake2Hasher), root.leaf_count()))
    }
Returns the root hash and leaf count at the specified L1 batch.
core/lib/merkle_tree/src/domain.rs