GITBOOK-5: How to Migrate Dapps from Ethereum

developer-guide/building-dapp-on-tomochain/how-to-migrate-dapp-from-ethereum.md

@@ -6,4 +6,78 @@ description: >-
 
 # How to Migrate Dapps from Ethereum
 
-Work In-Progress
+As we previously went through deployment step [here](../smart-contract-development/ides-and-tools/hardhat.md). Change your hardhat configuration to match the following code.
+
+```typescript
+import { HardhatUserConfig } from 'hardhat/config';
+import '@nomicfoundation/hardhat-toolbox';
+
+require('dotenv').config();
+
+const config: HardhatUserConfig = {
+  solidity: {
+    version: '0.8.17',
+  },
+  networks: {
+    ...
+    // for mainnet
+    'tomo-mainnet': {
+      url: 'https://rpc.tomochain.com',
+      accounts: [process.env.PRIVATE_KEY as string],
+    },
+    // for testnet
+    'tomo-testnet': {
+      url: 'https://rpc.testnet.tomochain.com',
+      accounts: [process.env.PRIVATE_KEY as string],
+    },
+    ...
+  },
+  defaultNetwork: 'hardhat',
+};
+
+export default config;
+```
+
+To deploy the contract to the TomoChain, you'll need to modify the scripts/deploy.ts in your project:
+
+{% hint style="info" %}
+You should modify your deploy script in order to meet your contract's requirements. This is just an example to deploy Token contract previously presented [here](../smart-contract-development/ides-and-tools/hardhat.md).
+{% endhint %}
+
+```typescript
+import { ethers } from 'hardhat';
+
+async function main() {
+  const gasLimit = 100_000_000;
+  const myToken = await ethers.deployContract('MyToken', { gasLimit });
+
+  await myToken.waitForDeployment();
+
+  console.log('Token Contract Deployed at ' + myToken.target);
+}
+
+// We recommend this pattern to be able to use async/await everywhere
+// and properly handle errors.
+main().catch((error) => {
+  console.error(error);
+  process.exitCode = 1;
+});
+```
+
+Finally run your script with:
+
+{% hint style="info" %}
+Your account (with private key: `process.env.PRIVATE_KEY`) must have enough fund to deploy your contract.
+{% endhint %}
+
+* Tomo Testnet
+
+```
+npx hardhat run scripts/deploy.ts --network tomo-testnet
+```
+
+* Tomo Mainnet
+
+```
+npx hardhat run scripts/deploy.ts --network tomo-mainnet
+```