remove sepolia references and use optimismSepolia references

CONTRIBUTING.md

@@ -16,7 +16,7 @@ pnpm run dev
 
 This will start a local server on `http://localhost:3000` with the example app linked to local package
 
-The burner wallet should be automatically connected to sepolia network, and can interact with the [`YourContract`](https://sepolia.etherscan.io/address/0x0D25b202D1B5126ECFcaeFa85f7a37ed86EF79ea) deployed on the sepolia.
+The burner wallet should be automatically connected to optimism sepolia network, and can interact with the [`YourContract`](https://optimism-sepolia.blockscout.com/address/0xFB30C0790128b97e3aC540E6124e512E37c47D00).
 
 ## Testing with hardhat
 

example/app/components/Example.tsx

@@ -7,6 +7,7 @@ import {
 import { FaucetButton } from "./FaucetButton";
 import toast from "react-hot-toast";
 import deployedContracts from "../contracts/deployedContracts";
+import { optimismSepolia } from "viem/chains";
 
 export const Example = () => {
   const { isConnected, chain } = useAccount();
@@ -19,7 +20,7 @@ export const Example = () => {
     chain?.id && chain.id in deployedContracts
       ? deployedContracts[chain.id as keyof typeof deployedContracts]
           .YourContract
-      : deployedContracts[11155420].YourContract;
+      : deployedContracts[optimismSepolia.id].YourContract;
 
   const { data: totalCounter } = useReadContract({
     ...yourContract,