Billboard Demo

The billboard example is the smallest useful migration exercise in this guide: a contract that stores and reads messages on-chain.

It is intentionally simple so you can focus on syntax and state-model differences instead of app complexity.

Source code

• Billboard Solidity source
• Billboard Move source

What to pay attention to

• Solidity contract becomes a Move module
• msg.sender becomes &signer
• contract storage becomes a resource such as Billboard
• external / view functions map to entry / #[view]
• events, errors, and tests all use Move-native syntax

Chapter order

1. Modules and initialization
2. Functions
3. Basic types
4. Structs and resources
5. Events
6. Errors
7. Testing