ethereum-optimism · sbvegan · Nov 5, 2025 · Nov 5, 2025 · Nov 5, 2025
@@ -20,7 +20,7 @@ You can do this on [Supersim](/interop/tools/supersim), [the Interop devnet](/in
 
 ### What you'll build
 
-*   A TypeScript application to transfer ETH chains
+*   A TypeScript application to transfer ETH between chains
 
 ### What you'll learn
 

@@ -73,7 +73,7 @@
 ## Get ETH on Sepolia and OP Sepolia

 This tutorial explains how to bridge tokens from Sepolia to OP Sepolia.
 You will need to get some ETH on both of these testnets.

 <Info>
  You can use [this faucet](https://sepoliafaucet.com) to get ETH on Sepolia.
@@ -101,7 +101,7 @@
 node
 ```

 This will bring up a Node REPL prompt that allows you to run javascript code.

 ## Import dependencies

@@ -137,7 +137,7 @@
  This step retrieves your private key from the environment variable you set earlier and converts it into an account object that Viem can use for transaction signing.

  The private key is essential for authorizing transactions on both L1 and L2 networks.
  For security reasons, we access it from an environment variable rather than hardcoding it.

  ```js
  const PRIVATE_KEY = process.env.TUTORIAL_PRIVATE_KEY || '';
@@ -429,7 +429,7 @@

  After the deposit transaction is confirmed, we check our token balance on L1 again to verify that the tokens have been deducted.

  This balance should be lower by the amount we bridged, as those tokens are now escrowed in the `L1StandardBridge` contract.
  This step helps confirm that the first part of the bridging process completed successfully:

  ```js
@@ -527,7 +527,7 @@
     functionName: 'balanceOf',
     args: [account.address]
   });
-  console.log(`L2 Balance after withdrawal: ${formatEther(l2Balance)}`);
+  console.log(`L2 Balance after withdrawal initiation: ${formatEther(l2Balance)}`);
 ```
   </Step>
 </Steps>

@@ -33,7 +33,7 @@
 ## Get ETH on Sepolia and OP Sepolia

 This tutorial explains how to send messages from Sepolia to OP Sepolia.
 You will need to get some ETH on both of these testnets.

 <Info>
  You can use [this faucet](https://sepoliafaucet.com/) to get ETH on Sepolia.
@@ -59,12 +59,12 @@
 <Steps>
  <Step title="Connect to Etherscan">
    Sending a message to the L2 `Greeter` contract via the L1 `Greeter` contract requires that you call the `sendGreeting` function.
    For simplicity, you'll interact with the contract directly on Etherscan.
    Open up the [L1 `Greeter` contract on Sepolia Etherscan](https://sepolia.etherscan.io/address/0x31A6Dd971306bb72f2ffF771bF30b1B98dB8B2c5#writeContract) and click the "Connect to Web3" button.
  </Step>

  <Step title="Send your greeting">
    Put a greeting into the field next to the "sendGreeting" function and click the "Write" button.
    You can use any greeting you'd like.
  </Step>

@@ -106,7 +106,7 @@
  </Step>

  <Step title="Send your greeting">
    Put a greeting into the field next to the "sendGreeting" function and click the "Write" button.
    You can use any greeting you'd like.

    <Info>
@@ -224,7 +224,7 @@
 ### The Messenger variable
 
 The `Greeter` contract has a `MESSENGER` variable that keeps track of the `CrossDomainMessenger` contract on the current chain.
-Check out the [Contract Addresses page](/superchain/addresses) to see the addresses of the `CrossDomainMessenger` contracts on whichever network you'll be using.
+Check out the [Contract Addresses page](/superchain/addresses) to see the addresses of the `CrossDomainMessenger` contracts on whatever network you'll be using.
 
 ```solidity
 address public immutable MESSENGER;
@@ -259,7 +259,7 @@
 }
 ```

 ### The sendGreeting function

 The `sendGreeting` function is the most important function in the `Greeter` contract.
 This is what you called earlier to send messages in both directions.
@@ -275,7 +275,7 @@
 }
 ```

 ### The setGreeting function

 The `setGreeting` function is the function that actually sets the greeting.
 This function is called by the `CrossDomainMessenger` contract on the other chain.

@@ -73,7 +73,7 @@ We'll run through a sample deposit directly with the `OptimismPortal` using cast
   </Step>
 
   <Step title="Send Deposit Transaction On L1">
-  We'll be using the first pre-funded account to send this deposit with 1 ether
+  We'll be using the first pre-funded account to send this deposit of 1 ether
 
     ```bash
     cast send 0x37a418800d0c812A9dE83Bc80e993A6b76511B57 --value 1ether --rpc-url http://localhost:8545 --private-key 0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80

@@ -313,10 +313,10 @@
 RPC_PARAMS=$(cat <<INNER_END_OF_FILE
 {
    "origin": "$ORIGIN",
    "blockNumber": "$BLOCK_NUMBER",
    "logIndex": "$LOG_INDEX",
    "timestamp": "$TIMESTAMP",
    "chainId": "$CHAIN_ID_A",
    "payload": "$LOG_ENTRY"
 }
 INNER_END_OF_FILE
@@ -331,7 +331,7 @@
 
     The [algorithm to calculate the access list](https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts-bedrock/src/L2/CrossL2Inbox.sol#L87-L115) is a bit complicated, but you dont need to worry about it.
     Supersim exposes [RPC calls](https://supersim.pages.dev/guides/interop/cast?highlight=manuall#7-construct-the-access-list-for-the-message) that calculates it for you on port 8420.
-    The code above will calculate the correct access list even if youre using a different interop cluster where autorelay is not functioning. 
+    The code above will calculate the correct access list even if you're using a different interop cluster where autorelay is not functioning.
     This is because the code implements a [pure function](https://en.wikipedia.org/wiki/Pure_function), which produces consistent results regardless of external state.
     In contrast, the `admin_getAccessListByMsgHash` RPC call is not a pure function, it is dependent on system state and therefore less flexible in these situations.
 

@@ -22,9 +22,7 @@ This requirement abstracts away the complexity of cross-chain validation.
 Achieving this requires deterministic deployment methods. There are multiple ways to do this.
 Here we will use the [SuperchainERC20 Starter Kit](/app-developers/starter-kit).
 
-<Expandable>
-
-title="About this tutorial"
+<Expandable title="About this tutorial">
 
 **What you'll learn**
 

@@ -67,7 +67,7 @@ You will need to get some ETH on Sepolia to follow along.
 
 ## Get ETH on OP Sepolia
 
-This tutorial explains how estimate transaction costs on OP Sepolia.
+This tutorial explains how to estimate transaction costs on OP Sepolia.
 You will need to get some ETH on OP Sepolia in order to run the code in this tutorial.
 
 <Info>
@@ -149,7 +149,7 @@ Here you'll estimate the cost of a simple transaction that sends a small amount
 <Steps>
   <Step title="Create the unsigned transaction">
 
-  Viem makes it easy to create unsigned transactions so you can estimate the cost of a transaction before you a user to sign it. 
+  Viem makes it easy to create unsigned transactions so you can estimate the cost of a transaction before asking a user to sign it.
   Here you'll create an unsigned transaction that sends a small amount of ETH from your address to the address `0x1000000000000000000000000000000000000000`. 
 
 ```js

@@ -49,7 +49,7 @@

 ## Get ETH on Sepolia and OP Sepolia

 This tutorial explains how to bridge tokens from Sepolia to OP Sepolia. You will need to get some ETH on both of these testnets.

 <Info>
  You can use [this faucet](https://sepoliafaucet.com) to get ETH on Sepolia.
@@ -75,7 +75,7 @@
 node
 ```
 
-This will bring up a Node REPL prompt that allows you to run javascript code.
+This will bring up a Node REPL prompt that allows you to run JavaScript code.
 
 ## Import dependencies