TrueTime is more of a client side library that utilizes a service like NTPd. You can implement a toy version of TrueTime with about 60 lines of C which uses a

TrueTime is more of a client side library that utilizes a service like NTPd. You can implement a toy version of TrueTime with about 60 lines of C which uses a single ntp_gettime call for each of the TrueTime api functions (now, before, after). If AWS's NTPd service offers drift <= 200 us/s, you could use it for TrueTime.