Below are my notes on how I used Foundry to deploy and interact with Ethereum contracts, illustrated by solving a simple Solidity challenge on the Goerli testnet. Specifically, it covers the basic setup of testing locally using a forked environment at a specific block, deploying using Forge, calling the deployed contract using Cast, and signing a message off-chain claiming the work was ours.

Behind major Ethereum applications, such as OpenSea for NFTs and dYdX for trading, there is usually a “blockchain developer platform” (e.g. Alchemy, QuickNode, Infura) that acts as an API layer to interact with any given blockchain network. For instance, to pull Uniswap on-chain price for WETH-USDC, I can get an API key from Alchemy and use Uniswap’s SDK (example below).

I wanted to create a personal page that was easy to maintain in markdown and quick to set up. I came across and was inspired by Andrej Karpathy’s simple Jekyll blog