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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On the big night, Harry Styles, an investor in the Co-op Live arena, owned the auditorium with his opening performance of his hypnotically clubby new single Aperture, appearing like a cross between Talking Heads' David Byrne and a particularly dapper investment banker in his high waisted trousers.