diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..a89c7fb
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,2 @@
+PRIVATE_KEY=0x
+INFURA_TOKEN=
diff --git a/.gitignore b/.gitignore
index 784148b..0056edc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ node_modules
 #Hardhat files
 cache
 artifacts
+.env
diff --git a/hardhat.config.js b/hardhat.config.js
index 74327d4..a7ebedd 100644
--- a/hardhat.config.js
+++ b/hardhat.config.js
@@ -1,6 +1,6 @@
 /* global task, ethers */
 require('@nomiclabs/hardhat-waffle')
-
+require('dotenv').config()
 // This is a sample Hardhat task. To learn how to create your own go to
 // https://hardhat.org/guides/create-task.html
 task('accounts', 'Prints the list of accounts', async () => {
@@ -19,4 +19,10 @@ task('accounts', 'Prints the list of accounts', async () => {
  */
 module.exports = {
   solidity: '0.6.12',
+  networks: {
+    goerli: {
+      url: `https://goerli.infura.io/v3/${process.env.INFURA_TOKEN}`,
+      accounts: [process.env.PRIVATE_KEY],
+    },
+  },
 }
diff --git a/scripts/sample-script.js b/scripts/sample-script.js
index a58a1f9..811f578 100644
--- a/scripts/sample-script.js
+++ b/scripts/sample-script.js
@@ -4,6 +4,9 @@
 // When running the script with `hardhat run <script>` you'll find the Hardhat
 // Runtime Environment's members available in the global scope.
 const hre = require('hardhat')
+const { toFixedHex, poseidonHash2 } = require('../src/utils')
+const toEns = (addr) => toFixedHex(addr, 20).padEnd(66, '0')
+const MerkleTree = require('fixed-merkle-tree')
 
 async function main() {
   // Hardhat always runs the compile task when running scripts with its command
@@ -13,13 +16,26 @@ async function main() {
   // manually to make sure everything is compiled
   // await hre.run('compile');
 
-  // We get the contract to deploy
-  const Greeter = await hre.ethers.getContractFactory('Greeter')
-  const greeter = await Greeter.deploy('Hello, Hardhat!')
-
-  await greeter.deployed()
-
-  console.log('Greeter deployed to:', greeter.address)
+  const BatchTreeUpdateVerifier = await hre.ethers.getContractFactory('BatchTreeUpdateVerifier')
+  const verifier = await BatchTreeUpdateVerifier.deploy()
+  await verifier.deployed()
+  const TornadoTrees = await hre.ethers.getContractFactory('TornadoTrees')
+  // bytes32 _governance,
+  //   bytes32 _tornadoProxy,
+  //   bytes32 _treeUpdateVerifier,
+  //   bytes32 _depositRoot,
+  //   bytes32 _withdrawalRoot
+  const levels = 20
+  const tree = new MerkleTree(levels, [], { hashFunction: poseidonHash2 })
+  const tornadoTrees = await TornadoTrees.deploy(
+    toEns('0x5efda50f22d34F262c29268506C5Fa42cB56A1Ce'),
+    toEns('0x905b63Fff465B9fFBF41DeA908CEb12478ec7601'),
+    toEns(verifier.address),
+    toFixedHex(tree.root()),
+    toFixedHex(tree.root()),
+  )
+  await tornadoTrees.deployed()
+  console.log('tornadoTrees deployed to:', tornadoTrees.address)
 }
 
 // We recommend this pattern to be able to use async/await everywhere