When a client asks for the time, it sends a random nonce. The server replies with a signed certificate containing both the nonce and a timestamp, proving the response happened after the request. Responses can be chained together with provable ordering; if any server’s timestamps are inconsistent with that ordering, that server is cryptographically “outed” as unreliable.
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视频以同样的混乱状态结束：警方试图封锁和控制现场，而路人仍不断走上桥面。