ETH Cluj 2026: How To Build on Arbitrum#
Welcome to the ETH Cluj 2026 workshop materials. This book covers everything from Ethereum fundamentals and Arbitrum’s role in the ecosystem, through writing your first Solidity smart contract, deep-diving into Stylus and WebAssembly, to building a full-stack dApp frontend.
Important Links#
Note
The contract code in this book was not written with ERC20 safety in mind. There are no return value checks. Not for production!