diff --git a/.gitignore b/.gitignore
index 85198aa..4250648 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,11 +1,8 @@
 # Compiler files
+broadcast/
 cache/
 out/
-
-# Ignores development broadcast logs
-!/broadcast
-/broadcast/*/31337/
-/broadcast/**/dry-run/
+zkout/
 
 # Docs
 docs/
diff --git a/.gitmodules b/.gitmodules
index 888d42d..690924b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "lib/forge-std"]
 	path = lib/forge-std
 	url = https://github.com/foundry-rs/forge-std
+[submodule "lib/openzeppelin-contracts"]
+	path = lib/openzeppelin-contracts
+	url = https://github.com/OpenZeppelin/openzeppelin-contracts
diff --git a/foundry.toml b/foundry.toml
index 25b918f..6529fb8 100644
--- a/foundry.toml
+++ b/foundry.toml
@@ -3,4 +3,5 @@ src = "src"
 out = "out"
 libs = ["lib"]
 
-# See more config options https://github.com/foundry-rs/foundry/blob/master/crates/config/README.md#all-options
+[profile.default.zksync]
+zksolc = "1.5.6"
diff --git a/lib/openzeppelin-contracts b/lib/openzeppelin-contracts
new file mode 160000
index 0000000..69c8def
--- /dev/null
+++ b/lib/openzeppelin-contracts
@@ -0,0 +1 @@
+Subproject commit 69c8def5f222ff96f2b5beff05dfba996368aa79
diff --git a/remappings.txt b/remappings.txt
new file mode 100644
index 0000000..6fdbafd
--- /dev/null
+++ b/remappings.txt
@@ -0,0 +1 @@
+@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/
diff --git a/script/ERC20.s.sol b/script/ERC20.s.sol
new file mode 100644
index 0000000..3d6d68e
--- /dev/null
+++ b/script/ERC20.s.sol
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.13;
+
+import {Script, console} from "forge-std/Script.sol";
+import {TestnetERC20Token} from "../src/TestnetERC20Token.sol";
+
+contract ERC20Script is Script {
+    TestnetERC20Token public dai;
+    TestnetERC20Token public wbtc;
+
+    function setUp() public {}
+
+    function run() public {
+        vm.startBroadcast();
+
+        dai = new TestnetERC20Token("DAI", "DAI", 18);
+        dai.mint(msg.sender, 10_000_000 * 10**18);
+        console.log("DAI address", address(dai));
+        console.log("DAI minted", dai.balanceOf(msg.sender));
+
+        wbtc = new TestnetERC20Token("WBTC", "WBTC", 18);
+        wbtc.mint(msg.sender, 10_000_000 * 10**18);
+        console.log("WBTC address", address(wbtc));
+        console.log("WBTC minted", wbtc.balanceOf(msg.sender));
+
+        vm.stopBroadcast();
+    }
+}
diff --git a/src/Counter.sol b/src/Counter.sol
index aded799..582041c 100644
--- a/src/Counter.sol
+++ b/src/Counter.sol
@@ -1,14 +1,24 @@
 // SPDX-License-Identifier: UNLICENSED
 pragma solidity ^0.8.13;
 
-contract Counter {
-    uint256 public number;
+import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
 
-    function setNumber(uint256 newNumber) public {
+contract Counter is Ownable {
+    uint256 private number;
+
+    constructor() Ownable(msg.sender) {}
+
+    function getNumber() public view returns (uint256) {
+        return number;
+    }
+
+    function setNumber(uint256 newNumber) public onlyOwner {
         number = newNumber;
     }
 
-    function increment() public {
+    function increment() public onlyOwner {
         number++;
     }
+
+    receive() external payable {}
 }
diff --git a/src/TestnetERC20Token.sol b/src/TestnetERC20Token.sol
new file mode 100644
index 0000000..4eaddf9
--- /dev/null
+++ b/src/TestnetERC20Token.sol
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity 0.8.24;
+
+import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+
+contract TestnetERC20Token is ERC20 {
+    // add this to be excluded from coverage report
+    function test() internal virtual {}
+
+    uint8 private _decimals;
+
+    constructor(string memory name_, string memory symbol_, uint8 decimals_) ERC20(name_, symbol_) {
+        _decimals = decimals_;
+    }
+
+    function mint(address _to, uint256 _amount) public returns (bool) {
+        _mint(_to, _amount);
+        return true;
+    }
+
+    function decimals() public view override returns (uint8) {
+        return _decimals;
+    }
+}
diff --git a/test/Counter.t.sol b/test/Counter.t.sol
deleted file mode 100644
index 54b724f..0000000
--- a/test/Counter.t.sol
+++ /dev/null
@@ -1,24 +0,0 @@
-// SPDX-License-Identifier: UNLICENSED
-pragma solidity ^0.8.13;
-
-import {Test, console} from "forge-std/Test.sol";
-import {Counter} from "../src/Counter.sol";
-
-contract CounterTest is Test {
-    Counter public counter;
-
-    function setUp() public {
-        counter = new Counter();
-        counter.setNumber(0);
-    }
-
-    function test_Increment() public {
-        counter.increment();
-        assertEq(counter.number(), 1);
-    }
-
-    function testFuzz_SetNumber(uint256 x) public {
-        counter.setNumber(x);
-        assertEq(counter.number(), x);
-    }
-}