====== NTS ======

the secure variant of ntp.

Here some useful links:
  * https://www.meinberg.de/german/info/nts-network-time-security.htm
  * https://blog.cloudflare.com/secure-time/
  * https://blog.cloudflare.com/nts-is-now-rfc
  * https://www.rfc-editor.org/info/rfc8915

Implementations supporting nts
  * https://www.ntpsec.org
  * https://chrony-project.org
  * https://github.com/pendulum-project/ntpd-rs