Introduction In the previous articles, I described what Bitcoin is and why

Introduction In the last article, I described how I define Bitcoin: as

Introduction Bitcoin is a topic that touches many fields, like computer science,

Deploy the InteractionLogger smart contract locally and on Arbitrum Sepolia, verify it on Arbiscan, and interact with it via console and blockchain explorer UI.

Build a test suite in TypeScript for the InteractionLogger smart contract, covering happy paths, emitted events, and custom error reverts.

Build your first Ethereum smart contract from scratch and understand how Solidity really works, from storage and events to custom errors and validation logic.

Before writing any code, we'll prepare the essentials: installing the core tools, setting up a wallet, and getting some test coins. By the end, we'll have a complete development environment ready to deploy and interact with our very first smart contract.