Vitalik Buterin: @danfinlay UserOperation 中的“nonce”字段是由于内存池的原因而存在的；您可以随心所欲地使用它，包括将一半位用于位域或其他任何东西。

原推：@danfinlay The `nonce` field in the UserOperation is there for mempool reasons; you can use it however you want, including using half the bits for a bitfield or whatever.
https://twitter.com/VitalikButerin/status/1553877216953774082