update hardhat instructions

src/content/docs/en/developers/verifying-smart-contracts.mdx

@@ -29,10 +29,15 @@ Most smart contract tooling has plugins for verifying your contracts easily on E
 | Scrollscan | https://api.scrollscan.com/api   | https://api-sepolia.scrollscan.com/api   |
 | Blockscout | https://blockscout.scroll.io/api | https://sepolia-blockscout.scroll.io/api |
 
+<Aside type="tip" title="Using the Scrollscan API">
+  When using Scrollscan, you will need to [register an account](https://scrollscan.com/register) and create an API key. The same key can be used for both Scroll Sepolia and mainnet. After creating your API key, please wait a few minutes before it comes into effect.
+</Aside>
+
 ### Hardhat
 
-First, modify `hardhat.config.ts` to point to Scroll's RPC and `sepolia-blockscout.scroll.io/api`. A dummy `apiKey` value is required, but anything works for its value.
+Modify `hardhat.config.ts` to point to Scroll's RPC and block explorer API. For Blockscout, a dummy `apiKey` value is required, but anything works for its value. For Scrollscan, use your own API key.
 
+For example, if you are using Scroll Sepolia on Blockscout, your config will look like this:
 ```javascript
 ...
 
@@ -95,8 +100,6 @@ Refer to the [Foundry documentation](https://book.getfoundry.sh/reference/forge/
 
 #### Scrollscan
 
-You will need to [register an account](https://scrollscan.com/register) to create an API key. The same key can be used for both Scroll Sepolia and mainnet. After creating your API key, please wait a few minutes before it comes into effect.
-
 ```bash
 forge verify-contract <contract address> <contract name> \
   --verifier-url https://api-sepolia.scrollscan.com/api \