A huge majority of internet routers use NTP. A huge majority of the long distance synchronous optical links use GPS to synchronize clocks. To use the IP protocol is essentially to trust in the US Goverment.

Any sufficiently self-deluded internet cryptoanarchist is indistinguishable from a crackpot.

The un-deluded cryptoanarchist would probably research how to transmit bitcoin over shortwave radio. Or better yet, use VHF/UHF moon bounce (EME). It is the only way to be safe.