diff --git a/contracts/interfaces/ISFC.sol b/contracts/interfaces/ISFC.sol
index 072c3d9..0650e7d 100644
--- a/contracts/interfaces/ISFC.sol
+++ b/contracts/interfaces/ISFC.sol
@@ -63,6 +63,8 @@ interface ISFC {
 
     function getValidatorPubkey(uint256) external view returns (bytes memory);
 
+    function pubkeyAddressToValidatorID(address pubkeyAddress) external view returns (uint256);
+
     function getWithdrawalRequest(
         address,
         uint256,
diff --git a/contracts/sfc/SFC.sol b/contracts/sfc/SFC.sol
index e63d546..e764a48 100644
--- a/contracts/sfc/SFC.sol
+++ b/contracts/sfc/SFC.sol
@@ -109,8 +109,8 @@ contract SFC is Initializable, Ownable, Version {
     // the governance contract (to recalculate votes when the stake changes)
     address public voteBookAddress;
 
-    // keccak256(pubkey bytes) => validator ID (prevents using the same key by multiple validators)
-    mapping(bytes32 pubkeyHash => uint256 validatorID) internal pubkeyHashToValidatorID;
+    // address derived from the validator pubkey => validator id
+    mapping(address pubkeyAddress => uint256 validatorID) public pubkeyAddressToValidatorID;
 
     // address authorized to initiate redirection
     address public redirectionAuthorizer;
@@ -358,7 +358,7 @@ contract SFC is Initializable, Ownable, Version {
         if (pubkey.length != 66 || pubkey[0] != 0xc0) {
             revert MalformedPubkey();
         }
-        if (pubkeyHashToValidatorID[keccak256(pubkey)] != 0) {
+        if (pubkeyAddressToValidatorID[_pubkeyToAddress(pubkey)] != 0) {
             revert PubkeyUsedByOtherValidator();
         }
         _createValidator(msg.sender, pubkey);
@@ -932,7 +932,7 @@ contract SFC is Initializable, Ownable, Version {
     }
 
     /// Create a new validator.
-    function _createValidator(address auth, bytes memory pubkey) internal {
+    function _createValidator(address auth, bytes calldata pubkey) internal {
         uint256 validatorID = ++lastValidatorID;
         _rawCreateValidator(auth, validatorID, pubkey, OK_STATUS, currentEpoch(), _now(), 0, 0);
     }
@@ -941,7 +941,7 @@ contract SFC is Initializable, Ownable, Version {
     function _rawCreateValidator(
         address auth,
         uint256 validatorID,
-        bytes memory pubkey,
+        bytes calldata pubkey,
         uint256 status,
         uint256 createdEpoch,
         uint256 createdTime,
@@ -959,7 +959,7 @@ contract SFC is Initializable, Ownable, Version {
         getValidator[validatorID].deactivatedEpoch = deactivatedEpoch;
         getValidator[validatorID].auth = auth;
         getValidatorPubkey[validatorID] = pubkey;
-        pubkeyHashToValidatorID[keccak256(pubkey)] = validatorID;
+        pubkeyAddressToValidatorID[_pubkeyToAddress(pubkey)] = validatorID;
 
         emit CreatedValidator(validatorID, auth, createdEpoch, createdTime);
         if (deactivatedEpoch != 0) {
@@ -1068,6 +1068,11 @@ contract SFC is Initializable, Ownable, Version {
         return (rawReward * commission) / Decimal.unit();
     }
 
+    /// Derive address from validator private key
+    function _pubkeyToAddress(bytes calldata pubkey) private pure returns (address) {
+        return address(uint160(uint256(keccak256(pubkey[2:]))));
+    }
+
     /// Get current time.
     function _now() internal view virtual returns (uint256) {
         return block.timestamp;
diff --git a/test/SFC.ts b/test/SFC.ts
index 15a5896..3cc2c40 100644
--- a/test/SFC.ts
+++ b/test/SFC.ts
@@ -394,9 +394,9 @@ describe('SFC', () => {
       const node = new BlockchainNode(this.sfc);
       const [validator, secondValidator] = await ethers.getSigners();
       const pubkey =
-        '0xc000a2941866e485442aa6b17d67d77f8a6c4580bb556894cc1618473eff1e18203d8cce50b563cf4c75e408886079b8f067069442ed52e2ac9e556baa3f8fcc525f';
+        '0xc0040220af695ae100c370c7acff4f57e5a0c507abbbc8ac6cc2ae0ce3a81747e0cd3c6892233faae1af5d982d05b1c13a0ad4449685f0b5a6138b301cc5263f8316';
       const secondPubkey =
-        '0xc000a2941866e485442aa6b17d67d77f8a6c4580bb556894cc1618473eff1e18203d8cce50b563cf4c75e408886079b8f067069442ed52e2ac9e556baa3f8fcc5251';
+        '0xc00499a876465bc626061bb2f0326df1a223c14e3bcdc3fff3deb0f95f316b9d586b03f00bbc2349be3d7908de8626cfd8f7fd6f73bff49df1299f44b6855562c33d';
       await this.sfc.enableNonNodeCalls();
 
       expect(await this.sfc.lastValidatorID()).to.equal(0);
@@ -428,6 +428,13 @@ describe('SFC', () => {
       expect(await this.sfc.getValidatorPubkey(firstValidatorID)).to.equal(pubkey);
       expect(await this.sfc.getValidatorPubkey(secondValidatorID)).to.equal(secondPubkey);
 
+      expect(await this.sfc.pubkeyAddressToValidatorID('0x65Db23D0c4FA8Ec58151a30E54e6a6046c97cD10')).to.equal(
+        firstValidatorID,
+      );
+      expect(await this.sfc.pubkeyAddressToValidatorID('0x1AA3196683eE97Adf5B398875828E322a34E8085')).to.equal(
+        secondValidatorID,
+      );
+
       const firstValidatorObj = await this.sfc.getValidator(firstValidatorID);
       const secondValidatorObj = await this.sfc.getValidator(secondValidatorID);
 
@@ -695,7 +702,7 @@ describe('SFC', () => {
       expect(await this.sfc.rewardsStash(this.delegator, this.validatorId)).to.equal(9_180);
     });
 
-    it('Should succeed andupdate the validator on node', async function () {
+    it('Should succeed and update the validator on node', async function () {
       await this.constants.updateOfflinePenaltyThresholdTime(10000);
       await this.constants.updateOfflinePenaltyThresholdBlocksNum(500);