feat: added withdrawal finalize step

content/tutorials/how-to-withdraw-eth/10.index.md

@@ -140,6 +140,92 @@ L2 Balance is 5712612651486983637
 Withdraw transaction sent 0x4905176d42b4c3b4ab10f611e688b2d849e761493f4583119b7c7731b4254cf4
 ```
 
+## Finalize withdrawal script
+
+Finalize withdrawal is the process that is run later on the L1 (once the L2 batches are proven), and which is actually responsible for transferring
+the tokens into your account.
+
+This part is permissionless - so anyone can trigger it. In sepolia, this is done by the cronjob, that is run by the community, but on all the other chains
+(mainnet, local networks), you have to trigger it yourself.
+
+
+### withdraw-finalize.ts script
+
+```typescript
+import { Wallet, Provider } from "zksync-ethers";
+import * as ethers from "ethers";
+
+// load env file
+import dotenv from "dotenv";
+dotenv.config();
+
+// HTTP RPC endpoints
+const L1_RPC_ENDPOINT = process.env.L1_RPC_ENDPOINT || ""; // or an RPC endpoint from Infura/Chainstack/QuickNode/etc.
+const L2_RPC_ENDPOINT = process.env.L2_RPC_ENDPOINT || "https://sepolia.era.zksync.dev"; // or the ZKsync Era mainnet
+
+// Wallet
+const WALLET_PRIV_KEY = process.env.WALLET_PRIV_KEY || "";
+
+
+if (!WALLET_PRIV_KEY) {
+  throw new Error("Wallet private key is not configured in env file");
+}
+
+if (!L1_RPC_ENDPOINT) {
+  throw new Error("Missing L1 RPC endpoint. Check chainlist.org or an RPC node provider");
+}
+
+async function main() {
+  // Please set your TX id, that you received from the withdraw.ts before.
+  const WITHDRAW_TX = "<WITHDRAW_TRANSACTION>"
+
+  console.log(`Finalizing withdrawal for ${WITHDRAW_TX}`);
+
+  // Initialize the wallet.
+  const l1provider = new ethers.Provider(L1_RPC_ENDPOINT);
+  const l2provider = new Provider(L2_RPC_ENDPOINT);
+  const wallet = new Wallet(WALLET_PRIV_KEY, l2provider, l1provider);
+
+  const isFinalized = await wallet.isWithdrawalFinalized(WITHDRAW_TX);
+  console.log("IS finalized ", isFinalized);
+
+  if (isFinalized == true) {
+    console.log("Your withdrawal is already finalized. Your tokens should be on L1");
+    console.log(`L1 Balance is ${await wallet.getBalanceL1()}`);
+    console.log(`L2 Balance is ${await wallet.getBalance()}`);
+
+  } else {
+    console.log(`L1 Balance before is  ${await wallet.getBalanceL1()}`);
+    console.log("Finalizing withdrawal now");
+
+    const result = await wallet.finalizeWithdrawal(WITHDRAW_TX);
+    console.log("Waiting for tx :", result.hash);
+    const receipt = await result.wait();
+
+    console.log("Receipt status: ", receipt?.status)
+    console.log(`L1 Balance after is  ${await wallet.getBalanceL1()}`);
+  }
+
+}
+
+main()
+  .then()
+  .catch((error) => {
+    console.error(error);
+    process.exitCode = 1;
+  });
+```
+
+### Run the Script
+
+Remember to set your withdrawal transaction from the previous step into the code at line 26 and execute the script using the following command:
+
+```sh
+npx ts-node withdraw-finalize.ts
+```
+
+
+
 ## Conclusion
 
 By following this guide, you have successfully withdrawn ETH from L2 to L1 using the ZKsync Javascript SDK.