diff --git a/packages/protocol/contracts/libs/LibZKP.sol b/packages/protocol/contracts/libs/LibZKP.sol
index 24d8f36758a..c035613dc52 100644
--- a/packages/protocol/contracts/libs/LibZKP.sol
+++ b/packages/protocol/contracts/libs/LibZKP.sol
@@ -16,7 +16,7 @@ library LibZKP {
         bytes calldata zkproof,
         bytes32 instance
     ) internal view returns (bool verified) {
-        (verified, ) = plonkVerifier.staticcall(
+        (bool isCallSuccess, bytes memory response) = plonkVerifier.staticcall(
             bytes.concat(
                 bytes16(0),
                 bytes16(instance), // left 16 bytes of the given instance
@@ -25,5 +25,7 @@ library LibZKP {
                 zkproof
             )
         );
+
+        return isCallSuccess && bytes32(response) == keccak256("taiko");
     }
 }
diff --git a/packages/protocol/contracts/libs/yul/PlonkVerifier_10_txs.yulp b/packages/protocol/contracts/libs/yul/PlonkVerifier_10_txs.yulp
index edb031b0c52..14371324e4b 100644
--- a/packages/protocol/contracts/libs/yul/PlonkVerifier_10_txs.yulp
+++ b/packages/protocol/contracts/libs/yul/PlonkVerifier_10_txs.yulp
@@ -2143,8 +2143,9 @@ success := and(eq(staticcall(gas(), 0x8, 0xbe60, 0x180, 0xbe60, 0x20), 1), succe
 success := and(eq(mload(0xbe60), 1), success)
 
     if not(success) { revert(0, 0) }
-    return(0, 0)
 
+    mstore(0x00, 0x93ac8fdbfc0b0608f9195474a0dd6242f019f5abc3c4e26ad51fefb059cc0177) // keccak256("taiko")
+    return(0, 32)
         }
     }
 }
diff --git a/packages/protocol/contracts/libs/yul/PlonkVerifier_80_txs.yulp b/packages/protocol/contracts/libs/yul/PlonkVerifier_80_txs.yulp
index db9ab392d12..cd2bda5ebb9 100644
--- a/packages/protocol/contracts/libs/yul/PlonkVerifier_80_txs.yulp
+++ b/packages/protocol/contracts/libs/yul/PlonkVerifier_80_txs.yulp
@@ -2145,8 +2145,9 @@ success := and(eq(staticcall(gas(), 0x8, 0xbea0, 0x180, 0xbea0, 0x20), 1), succe
 success := and(eq(mload(0xbea0), 1), success)
 
     if not(success) { revert(0, 0) }
-    return(0, 0)
 
+    mstore(0x00, 0x93ac8fdbfc0b0608f9195474a0dd6242f019f5abc3c4e26ad51fefb059cc0177) // keccak256("taiko")
+    return(0, 32)
         }
     }
 }
diff --git a/packages/protocol/test/libs/LibZKP.test.ts b/packages/protocol/test/libs/LibZKP.test.ts
index 71b7fe49f5a..00faddf299a 100644
--- a/packages/protocol/test/libs/LibZKP.test.ts
+++ b/packages/protocol/test/libs/LibZKP.test.ts
@@ -30,4 +30,33 @@ describe("LibZKP", function () {
 
         expect(result).to.be.true;
     });
+
+    it("should not successfully verifiy the given zkp and instance when the given contract address is not PlonkVerifier", async function () {
+        // random EOA address
+        let result = await libZKP.verify(
+            ethers.Wallet.createRandom().address,
+            testProof.result.circuit.proof,
+            ethers.utils.hexConcat([
+                testProof.result.circuit.instance[0],
+                testProof.result.circuit.instance[1],
+            ])
+        );
+
+        expect(result).to.be.false;
+
+        // another smart contract
+        const testERC20 = await utils.deployContract(hre, "TestERC20", {}, [
+            1024,
+        ]);
+        result = await libZKP.verify(
+            testERC20.address,
+            testProof.result.circuit.proof,
+            ethers.utils.hexConcat([
+                testProof.result.circuit.instance[0],
+                testProof.result.circuit.instance[1],
+            ])
+        );
+
+        expect(result).to.be.false;
+    });
 });