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.
What it looks like for real
Multi-format adaptation，详情可参考体育直播
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第一百一十三条 经承运人证明，旅客的人身伤亡或者行李的灭失、损坏是因旅客本人的过失或者旅客和承运人的共同过失造成的，可以免除或者相应减轻承运人的赔偿责任。
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