Modifying the Code

First we will implement the getBlockHeight function. The goal of this function is to fetch recent blocks from the Data API then to return the highest block in the first position.

Next we will implement the listErc20Balances function. The goal of this function is to fetch the ERC-20 token balances for a given address at a specific block height.

First we will implement the fetchERC20Balances function. The goal of this function is to make a call to our backend to get the user's ERC-20 token balances.

Next we will implement the handleSetAddress function. The goal of this function is to set the address in the state and fetch the ERC-20 token balances for that address using our fetchERC20Balances function.