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We have a #NTS (#NTP secure) but it depends on TLS which depends on X.509 certificates which depend on time... Chicken-and-egg problems are common when securing time.
#Roughtime is currently a Internet-Draft. https://datatracker.ietf.org/doc/draft-ietf-ntp-roughtime/ (speaker is a co-author).
Important concepts: very long-term server keys, several servers queried by the client
IETF DatatrackerRoughtimeThis document describes Roughtime—a protocol that aims to achieve two things: secure rough time synchronization even for clients without any idea of what time it is, and giving clients a format by which to report any inconsistencies they observe between time servers. This document specifies the on-wire protocol required for these goals, and discusses aspects of the ecosystem needed for it to work.