...uint amount; //Amount of tokens the option contract is for
bool exercised; //Has option been exercised
bool canceled; //Has option been canceled
uint id; //Unique ID of option, also array index
uint latestCost; //Helper to show last updated cost to exercise
...
...a transaction tree produced during a round](https://img.learnblockchain.cn/2025/08/21/round-transaction-tree.svg)
\- 一个在某回合中产生的交易树的例子 -
### 用户交互需求
当前的 Ark 实现要求用户在回合中主动参与,因为:
- **VTXO 挑选**:用户选择放...