diff --git a/coordinator/internal/logic/old_verifier/mock.go b/coordinator/internal/logic/old_verifier/mock.go
new file mode 100644
index 000000000..6bee4f0ac
--- /dev/null
+++ b/coordinator/internal/logic/old_verifier/mock.go
@@ -0,0 +1,34 @@
+//go:build mock_verifier
+
+package old_verifier
+
+import (
+	"scroll-tech/common/types/message"
+	"scroll-tech/coordinator/internal/config"
+)
+
+const InvalidTestProof = "this is a invalid proof"
+
+// OldVerifier represents a mock halo2 verifier.
+type OldVerifier struct{}
+
+// NewVerifier Sets up a mock verifier.
+func NewOldVerifier(_ *config.VerifierConfig) (*OldVerifier, error) {
+	return &OldVerifier{}, nil
+}
+
+// VerifyChunkProof return a mock verification result for a ChunkProof.
+func (v *OldVerifier) VerifyChunkProof(proof *message.ChunkProof) (bool, error) {
+	if string(proof.Proof) == InvalidTestProof {
+		return false, nil
+	}
+	return true, nil
+}
+
+// VerifyBatchProof return a mock verification result for a BatchProof.
+func (v *OldVerifier) VerifyBatchProof(proof *message.BatchProof) (bool, error) {
+	if string(proof.Proof) == InvalidTestProof {
+		return false, nil
+	}
+	return true, nil
+}
diff --git a/coordinator/internal/logic/verifier/mock.go b/coordinator/internal/logic/verifier/mock.go
index 61f459431..f3a8eb3f5 100644
--- a/coordinator/internal/logic/verifier/mock.go
+++ b/coordinator/internal/logic/verifier/mock.go
@@ -33,27 +33,3 @@ func (v *Verifier) VerifyBatchProof(proof *message.BatchProof) (bool, error) {
 	}
 	return true, nil
 }
-
-// OldVerifier represents a mock halo2 verifier.
-type OldVerifier struct{}
-
-// NewVerifier Sets up a mock verifier.
-func NewOldVerifier(_ *config.VerifierConfig) (*OldVerifier, error) {
-	return &OldVerifier{}, nil
-}
-
-// VerifyChunkProof return a mock verification result for a ChunkProof.
-func (v *OldVerifier) VerifyChunkProof(proof *message.ChunkProof) (bool, error) {
-	if string(proof.Proof) == InvalidTestProof {
-		return false, nil
-	}
-	return true, nil
-}
-
-// VerifyBatchProof return a mock verification result for a BatchProof.
-func (v *OldVerifier) VerifyBatchProof(proof *message.BatchProof) (bool, error) {
-	if string(proof.Proof) == InvalidTestProof {
-		return false, nil
-	}
-	return true, nil
-}