Deployed policies cannot change and are digitally signed to allow any service to check its authenticity and completeness.
不能改变已部署的策略,而且都使用了数字签以允许任何服务检查它的可靠性和完整性。
2
On receiving this signed order, the online-trade server needs to validate the uniqueness of the nonce and check whether its identity is specified as the intended recipient.