You avoid double spending in Sui because each object has a unique ID and ownership rules that the system strictly enforces. When you submit a transaction, Sui checks whether the object you're trying to use has already been consumed or modified in another transaction. If it has, your transaction gets rejected. This is possible because Sui tracks object versions and ensures that only one transaction can mutate a specific object at a time. The object-centric model also allows Sui to isolate transactions, so unrelated ones can run in parallel without risking conflicts. This setup gives you strong guarantees that assets can’t be duplicated or spent twice.

3. Transaction-Level Atomicity & Locking When a transaction is submitted, it specifies the exact objects it reads and writes. The Sui consensus and execution layer locks these objects during the transaction processing. If another transaction tries to spend the same object concurrently, it will be rejected or delayed. This ensures that only one transaction can spend a specific object version at a time, preventing double spending.
4. Versioning and Object State Updates After spending an object, a new version (up

They must be moved (transferred) or destroyed explicitly. This guarantees that once an object is spent in one transaction, it cannot appear in another transaction simultaneously.

3. Transaction-Level Atomicity & Locking When a transaction is submitted, it specifies the exact objects it reads and writes. The Sui consensus and execution layer locks these objects during the transaction processing. If another transaction tries to spend the same object concurrently, it will be rejected or delayed. This ensures that only one transaction

You avoid double spending on Sui because of its object-based model, where every asset or piece of data is treated as an object with a unique ID and strict ownership rules. Each transaction must specify the exact version of an object it wants to use, and once that version is consumed in a confirmed transaction, it cannot be reused. If two transactions try to use the same object version at the same time, only the first valid one succeeds, while the other gets rejected as invalid. This ensures that no object, like a token or NFT, can be spent or transferred twice.