diff --git a/pallets/identity-management-mock/src/lib.rs b/pallets/identity-management-mock/src/lib.rs
index 7752c75fae..afc961373e 100644
--- a/pallets/identity-management-mock/src/lib.rs
+++ b/pallets/identity-management-mock/src/lib.rs
@@ -546,7 +546,7 @@ pub mod pallet {
 		) -> DispatchResult {
 			let code =
 				Self::challenge_codes(who, identity).ok_or(Error::<T>::ChallengeCodeNotExist)?;
-			let msg = Self::get_expected_web3_message(who, identity, &code)?;
+			let msg = Self::get_expected_payload(who, identity, &code)?;
 
 			ensure!(
 				msg.as_slice() == validation_data.message.as_slice(),
@@ -599,7 +599,7 @@ pub mod pallet {
 		) -> DispatchResult {
 			let code =
 				Self::challenge_codes(who, identity).ok_or(Error::<T>::ChallengeCodeNotExist)?;
-			let msg = Self::get_expected_web3_message(who, identity, &code)?;
+			let msg = Self::get_expected_payload(who, identity, &code)?;
 			let digest = Self::compute_evm_msg_digest(&msg);
 			if let IdentityMultiSignature::Ethereum(sig) = &validation_data.signature {
 				let recovered_evm_address = Self::recover_evm_address(&digest, sig.as_ref())
@@ -621,10 +621,9 @@ pub mod pallet {
 			Ok(())
 		}
 
-		// web3 message format: <challeng-code> + <litentry-AccountId32> + <Identity>, where
-		// <> means SCALE-encoded
-		// Notice: actually we use the same format for web2 message too
-		pub fn get_expected_web3_message(
+		// Payload format: blake2_256(<challeng-code> + <litentry-AccountId32> + <Identity>), where
+		// <> means SCALE-encoded. It applies to both web2 and web3 message
+		pub fn get_expected_payload(
 			who: &T::AccountId,
 			identity: &Identity,
 			code: &ChallengeCode,
@@ -632,7 +631,7 @@ pub mod pallet {
 			let mut msg = code.encode();
 			msg.append(&mut who.encode());
 			msg.append(&mut identity.encode());
-			Ok(msg)
+			Ok(blake2_256(&msg).to_vec())
 		}
 
 		// we use an EIP-191 message has computing
diff --git a/pallets/identity-management-mock/src/mock.rs b/pallets/identity-management-mock/src/mock.rs
index 8309b1218e..20cd46aa83 100644
--- a/pallets/identity-management-mock/src/mock.rs
+++ b/pallets/identity-management-mock/src/mock.rs
@@ -177,7 +177,7 @@ pub fn create_mock_polkadot_validation_data(
 	code: ChallengeCode,
 ) -> ValidationData {
 	let identity = create_mock_polkadot_identity(p.public().0);
-	let msg = IdentityManagementMock::get_expected_web3_message(&who, &identity, &code)
+	let msg = IdentityManagementMock::get_expected_payload(&who, &identity, &code)
 		.expect("cannot calculate web3 message");
 	let sig = p.sign(&msg);
 
@@ -194,7 +194,7 @@ pub fn create_mock_eth_validation_data(
 	code: ChallengeCode,
 ) -> ValidationData {
 	let identity = create_mock_eth_identity(p.address().0);
-	let msg = IdentityManagementMock::get_expected_web3_message(&who, &identity, &code)
+	let msg = IdentityManagementMock::get_expected_payload(&who, &identity, &code)
 		.expect("cannot calculate web3 message");
 	let digest = IdentityManagementMock::compute_evm_msg_digest(&msg);
 	let sig = sign(p.secret(), &Message::from(digest)).unwrap();