@@ -6,5 +6,5 @@
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-plonky2 = { git = "https://github.com/mir-protocol/plonky2", branch = "semaphore-example" }
-anyhow = "1.0.56"+plonky2 = { git = "https://github.com/mir-protocol/plonky2" }
+anyhow = "1.0.56"

@@ -46,7 +46,7 @@ let mut builder = CircuitBuilder::new(config);
         let mut pw = PartialWitness::new();
 
         let targets = self.semaphore_circuit(&mut builder);
-        self.fill_semaphore_targets(&mut pw, private_key, topic, public_key_index, targets);
+        self.fill_semaphore_targets(&mut pw, private_key, topic, public_key_index, targets)?;
 
         let data = builder.build();
         let proof = data.prove(pw)?;
@@ -56,7 +56,7 @@ Signal {
                 nullifier,
                 proof: proof.proof,
             },
-            data.to_verifier_data(),
+            data.verifier_data(),
         ))
     }
 }

@@ -1,9 +1,10 @@
-use plonky2::field::field_types::Field;
-use plonky2::hash::hash_types::{HashOutTarget, MerkleCapTarget};
+use anyhow::Result;
+use plonky2::field::types::Field;
+use plonky2::hash::hash_types::HashOutTarget;
 use plonky2::hash::merkle_proofs::MerkleProofTarget;
 use plonky2::hash::poseidon::PoseidonHash;
 use plonky2::iop::target::Target;
-use plonky2::iop::witness::{PartialWitness, Witness};
+use plonky2::iop::witness::{PartialWitness, WitnessWrite};
 use plonky2::plonk::circuit_builder::CircuitBuilder;
 
 use crate::access_set::AccessSet;
@@ -44,7 +45,7 @@ let zero = builder.zero();
         builder.verify_merkle_proof::<PoseidonHash>(
             [private_key, [zero; 4]].concat(),
             &public_key_index_bits,
-            &MerkleCapTarget(vec![merkle_root]),
+            merkle_root,
             &merkle_proof,
         );
 
@@ -71,7 +72,7 @@ private_key: Digest,
         topic: Digest,
         public_key_index: usize,
         targets: SemaphoreTargets,
-    ) {
+    ) -> Result<()> {
         let SemaphoreTargets {
             merkle_root,
             topic: topic_target,
@@ -80,13 +81,13 @@ private_key: private_key_target,
             public_key_index: public_key_index_target,
         } = targets;
 
-        pw.set_hash_target(merkle_root, self.0.cap.0[0]);
-        pw.set_targets(&private_key_target, &private_key);
-        pw.set_targets(&topic_target, &topic);
+        pw.set_hash_target(merkle_root, self.0.cap.0[0])?;
+        pw.set_target_arr(&private_key_target, &private_key)?;
+        pw.set_target_arr(&topic_target, &topic)?;
         pw.set_target(
             public_key_index_target,
             F::from_canonical_usize(public_key_index),
-        );
+        )?;
 
         let merkle_proof = self.0.prove(public_key_index);
         for (ht, h) in merkle_proof_target
@@ -94,7 +95,8 @@ .siblings
             .into_iter()
             .zip(merkle_proof.siblings)
         {
-            pw.set_hash_target(ht, h);
+            pw.set_hash_target(ht, h)?;
         }
+        Ok(())
     }
 }

@@ -1,6 +1,7 @@
-use plonky2::iop::witness::{PartialWitness, Witness};
+use anyhow::Result;
+use plonky2::iop::witness::{PartialWitness, WitnessWrite};
 use plonky2::plonk::circuit_builder::CircuitBuilder;
-use plonky2::plonk::circuit_data::{CircuitConfig, VerifierCircuitData, VerifierCircuitTarget};
+use plonky2::plonk::circuit_data::{CircuitConfig, VerifierCircuitData};
 use plonky2::plonk::proof::ProofWithPublicInputs;
 
 use crate::access_set::AccessSet;
@@ -14,7 +15,7 @@ signal0: Signal,
         topic1: Digest,
         signal1: Signal,
         verifier_data: &VerifierCircuitData<F, C, 2>,
-    ) -> (Digest, Digest, PlonkyProof) {
+    ) -> Result<(Digest, Digest, PlonkyProof, VerifierCircuitData<F, C, 2>)> {
         let config = CircuitConfig::standard_recursion_zk_config();
         let mut builder = CircuitBuilder::new(config);
         let mut pw = PartialWitness::new();
@@ -45,7 +46,7 @@ &ProofWithPublicInputs {
                 proof: signal0.proof,
                 public_inputs: public_inputs0,
             },
-        );
+        )?;
         let proof_target1 = builder.add_virtual_proof_with_pis(&verifier_data.common);
         pw.set_proof_with_pis_target(
             &proof_target1,
@@ -53,25 +54,28 @@ &ProofWithPublicInputs {
                 proof: signal1.proof,
                 public_inputs: public_inputs1,
             },
-        );
+        )?;
 
-        let vd_target = VerifierCircuitTarget {
-            constants_sigmas_cap: builder
-                .add_virtual_cap(verifier_data.common.config.fri_config.cap_height),
-        };
+        let vd_target =
+            builder.add_virtual_verifier_data(verifier_data.common.config.fri_config.cap_height);
         pw.set_cap_target(
             &vd_target.constants_sigmas_cap,
             &verifier_data.verifier_only.constants_sigmas_cap,
-        );
+        )?;
 
-        builder.verify_proof(proof_target0, &vd_target, &verifier_data.common);
-        builder.verify_proof(proof_target1, &vd_target, &verifier_data.common);
+        builder.verify_proof::<C>(&proof_target0, &vd_target, &verifier_data.common);
+        builder.verify_proof::<C>(&proof_target1, &vd_target, &verifier_data.common);
 
         let data = builder.build();
         let recursive_proof = data.prove(pw).unwrap();
 
         data.verify(recursive_proof.clone()).unwrap();
 
-        (signal0.nullifier, signal1.nullifier, recursive_proof.proof)
+        Ok((
+            signal0.nullifier,
+            signal1.nullifier,
+            recursive_proof.proof,
+            data.verifier_data(),
+        ))
     }
 }

@@ -16,7 +16,7 @@
 #[cfg(test)]
 mod tests {
     use anyhow::Result;
-    use plonky2::field::field_types::Field;
+    use plonky2::field::types::{Field, Sample};
     use plonky2::hash::merkle_tree::MerkleTree;
     use plonky2::hash::poseidon::PoseidonHash;
     use plonky2::plonk::config::Hasher;
@@ -27,7 +27,7 @@
     #[test]
     fn test_semaphore() -> Result<()> {
         let n = 1 << 20;
-        let private_keys: Vec<Digest> = (0..n).map(|_| F::rand_arr()).collect();
+        let private_keys: Vec<Digest> = (0..n).map(|_| F::rand_array()).collect();
         let public_keys: Vec<Vec<F>> = private_keys
             .iter()
             .map(|&sk| {
@@ -39,7 +39,7 @@ .collect();
         let access_set = AccessSet(MerkleTree::new(public_keys, 0));
 
         let i = 12;
-        let topic = F::rand_arr();
+        let topic = F::rand_array();
 
         let (signal, vd) = access_set.make_signal(private_keys[i], topic, i)?;
         access_set.verify_signal(topic, signal, &vd)