The signed transaction encodes several pieces of information, including the chain ID.
For example, the Ethereum mainnet chain ID is 1, Ropsten is 3, and Polygon is 137 ⛓️
签名的交易编码了几条信息，包括链 ID。
比如以太坊主网链ID是1，Ropsten是3，Polygon是137⛓️
The signed transaction encodes several pieces of information, including the chain ID.
For example, the Ethereum mainnet chain ID is 1, Ropsten is 3, and Polygon is 137 ⛓️
签名的交易编码了几条信息，包括链 ID。
比如以太坊主网链ID是1，Ropsten是3，Polygon是137⛓️