Chain ID has two purposes:
- Indicates the chain the transaction is meant for, so participants can tell whether a broadcasted message should be processed, or if it should be dropped and ignored
- Prevents so-called “replay attacks”
链 ID 有两个用途：
- 指示交易的链，因此参与者可以判断是否应该处理广播消息，或者是否应该丢弃和忽略它
- 防止所谓的“重放攻击”