Wen you don't trust NTP:
https://en.wikipedia.org/wiki/Network_Time_Protocol
https://opentimestamps.org/
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Good point. Also, there was a reflection ddos bug in Linux NTP about 10 years ago.
Really, I missed that, haven't played with NTP with century 😂
It's famous as "NTP Amplification Attack" 😁
Googling now:
