Move Language (Aptos and Sui)

What Move Is

Move is a smart-contract language originally developed at Facebook for the Diem (formerly Libra) blockchain. After Diem shut down, Aptos and Sui — both founded by former Diem team members — picked up Move as their primary smart-contract language. Move is notable for its 'resource' model: assets like tokens are first-class language constructs that can't be copied or accidentally deleted, only moved between owners. This eliminates a class of bugs (double-spending, accidental burn) at the language level.

Why Resources Matter

In Solidity, your token balance is just a number in a mapping. The contract has to enforce 'this balance can't decrease without an authorised transfer.' Bugs in that enforcement (Cream Finance, Compound's COMP distribution bug, others) have produced major losses. In Move, a token is a 'resource' — the language type system tracks ownership. You literally can't write code that copies a token or destroys it without using a defined `destroy` operation. Whole exploit categories that exist on Solidity are unrepresentable in Move.

Aptos vs Sui — Same Language, Different Ecosystems

Both Aptos and Sui use Move, but the chains diverge. **Aptos** uses Move closer to its original Diem form (Move 1) with sequential execution. **Sui** uses Move with significant modifications (Sui Move) and parallel execution similar to Solana's Sealevel. The forks are now substantially different — code written for Aptos isn't directly portable to Sui. Both chains have meaningful TVL ($1-3B each at various points) and active developer ecosystems.

• Move originated at Facebook for the Diem project; lives on in Aptos and Sui
• Resource model: assets are first-class types that can't be copied or accidentally destroyed
• Aptos: closer to original Move with sequential execution
• Sui: forked Move with parallel execution and significant modifications