diff --git a/script/SetSeed.s.sol b/script/SetSeed.s.sol
index f512bf4..1be6f8d 100644
--- a/script/SetSeed.s.sol
+++ b/script/SetSeed.s.sol
@@ -25,7 +25,9 @@ contract SetSeed is Script {
         console.log("BTC_ADDR2:", btcAddr2);
 
         // get network
-        uint network = vm.envUint("Network");
+        uint _network = vm.envUint("Network");
+        uint8 network = uint8(_network);
+        
         console.log("Network:", network);
 
         BTCDepositAddressDeriver deriver = BTCDepositAddressDeriver(
@@ -34,7 +36,7 @@ contract SetSeed is Script {
 
         // set validators' pubkeys and network prefix
         vm.startBroadcast();
-        deriver.setSeed(btcAddr1, btcAddr2, BTCDepositAddressDeriver.BitcoinNetwork(network));
+        deriver.setSeed(btcAddr1, btcAddr2, network);
         vm.stopBroadcast();
     }
 }
diff --git a/src/BTCDepositAddressDeriver.sol b/src/BTCDepositAddressDeriver.sol
index dcd0e55..17e36cf 100644
--- a/src/BTCDepositAddressDeriver.sol
+++ b/src/BTCDepositAddressDeriver.sol
@@ -17,12 +17,6 @@ error CannotParseBtcAddress(
 
 contract BTCDepositAddressDeriver {
 
-    enum BitcoinNetwork {
-        TESTNET,
-        MAINNET,
-        REGTEST
-    }
-
     event SeedChanged(string btcAddr1, string btcAddr2, string hrp);
 
     bool public wasSeedSet;
@@ -48,7 +42,7 @@ contract BTCDepositAddressDeriver {
     function setSeed(
         string calldata _btcAddr1,
         string calldata _btcAddr2,
-        BitcoinNetwork _network
+        uint8 _network
     ) public virtual {
 
         string memory _hrp = getNetworkPrefix(_network);
@@ -67,17 +61,19 @@ contract BTCDepositAddressDeriver {
 
     // get address prefix from network type
     function getNetworkPrefix(
-        BitcoinNetwork _network
+        uint8 _network
     ) public pure returns (string memory) {
 
         string memory _hrp;
 
-        if (_network == BitcoinNetwork.TESTNET) {
+        if (_network == 0) {
             _hrp = 'tb';
-        } else if (_network == BitcoinNetwork.MAINNET) {
+        } else if (_network == 1) {
             _hrp = 'bc';
-        } else if (_network == BitcoinNetwork.REGTEST) {
+        } else if (_network == 2) {
             _hrp = 'brct';
+        } else {
+            _hrp = 'unknown';
         }
 
         return _hrp;
diff --git a/test/BTCDepositAddressDeriver.t.sol b/test/BTCDepositAddressDeriver.t.sol
index a4ca5a5..cae6a4a 100644
--- a/test/BTCDepositAddressDeriver.t.sol
+++ b/test/BTCDepositAddressDeriver.t.sol
@@ -62,7 +62,7 @@ contract BTCDepositAddressDeriverTest is Test {
         deriver.setSeed(
             "tb1p7g532zgvuzv8fz3hs02wvn2almqh8qyvz4xdr564nannkxh28kdq62ewy3",
             "tb1psfpmk6v8cvd8kr4rdda0l8gwyn42v5yfjlqkhnureprgs5tuumkqvdkewz",
-            BTCDepositAddressDeriver.BitcoinNetwork.TESTNET
+            0
         );
 
         assertEq(deriver.wasSeedSet(), true);
@@ -97,7 +97,7 @@ contract BTCDepositAddressDeriverTest is Test {
         deriver.setSeed(
             "tb1p7g532zgvuzv8fz3hs02wvn2almqh8qyvz4xdr564nannkxh28kdq62ewy3",
             "tb1psfpmk6v8cvd8kr4rdda0l8gwyn42v5yfjlqkhnureprgs5tuumkqvdkewz",
-            BTCDepositAddressDeriver.BitcoinNetwork.TESTNET
+            0
         );
 
         string memory btcAddress = deriver.getBTCDepositAddress(