This code snippets demonstrates how to connect to Hedera Testnet using Viem.
Copy the .env.example file to .env,
then edit it to add the URL for a JSON-RPC endpoint for Hedera Testnet.
To obtain this URL, see the JSON-RPC connections documentation.
In the connect.js file in this directory,
an instance of viem.Chain is created as hederaTestnetChain.
This is essentially configuration for the RPC connection.
The cirtical part within this is rpcUrls.default.http,
where the JSON_RPC endpoint value is set.
Subsequently a couple of RPCs are invoked to obtain the block number, and the HBAR balance of a specified account. These are simply to verify that the connection works properly.