diff --git a/plonky2x/verifier/system/groth16.go b/plonky2x/verifier/system/groth16.go
index 36fe672f..70eeadff 100644
--- a/plonky2x/verifier/system/groth16.go
+++ b/plonky2x/verifier/system/groth16.go
@@ -269,10 +269,7 @@ func (s *Groth16System) ProveCircuit(r1cs constraint.ConstraintSystem, pk groth1
 	const fpSize = 4 * 8
 
 	// read in proof.json and extract the proof bytes
-	proofBytes, err := os.ReadFile("proof.json")
-	if err != nil {
-		return nil, nil, errors.Wrap(err, "read proof file")
-	}
+	proofBytes := _proof.Ar.Marshal()
 
 	proofs := make([]string, 8)
 	// Print out the proof
diff --git a/plonky2x/verifier/system/plonk.go b/plonky2x/verifier/system/plonk.go
index 0296186a..7effccd9 100644
--- a/plonky2x/verifier/system/plonk.go
+++ b/plonky2x/verifier/system/plonk.go
@@ -11,8 +11,8 @@ import (
 	"time"
 
 	"github.com/consensys/gnark-crypto/ecc"
-	groth16Bn254 "github.com/consensys/gnark/backend/groth16/bn254"
 	"github.com/consensys/gnark/backend/plonk"
+	plonk16Bn254 "github.com/consensys/gnark/backend/plonk/bn254"
 	"github.com/consensys/gnark/backend/witness"
 	"github.com/consensys/gnark/constraint"
 	"github.com/consensys/gnark/frontend"
@@ -246,11 +246,11 @@ func (s *PlonkSystem) ProveCircuit(r1cs constraint.ConstraintSystem, pk plonk.Pr
 	elapsed = time.Since(start)
 	s.logger.Info().Msg("Successfully created proof in " + elapsed.String())
 
-	_proof := proof.(*groth16Bn254.Proof)
+	_proof := proof.(*plonk16Bn254.Proof)
 	s.logger.Info().Msg("Saving proof to proof.json")
 	jsonProof, err := json.Marshal(ProofResult{
 		Output: []byte{},
-		Proof:  _proof.Ar.Marshal(),
+		Proof:  _proof.MarshalSolidity(),
 	})
 	if err != nil {
 		return nil, nil, errors.Wrap(err, "marshal proof")