Hurdle Word 4 hintLand.
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《法律深处是人心：中华优秀传统法律文化探秘》：龙大轩等著；法律出版社出版。
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.