NTP/NTS

Synchronized Time

Roughtime service

This server also provides secure Roughtime service. It is monitored and maintained at the same service level as the NTP service provided. The time is synchronized with stratum 1 upstreams.

Address:

time.txryan.com:2002

ED25519 public key:

iBVjxg/1j7y1+kQUTBYdTabxCppesU/07D4PMDJk2WA=

Here is a valid ecosystem.json file to use Roughtime provided by this server:

{
    "servers": [
        {
            "name": "Cloudflare-Roughtime-2",
            "version": "IETF-Roughtime",
            "publicKeyType": "ed25519",
            "publicKey": "0GD7c3yP8xEc4Zl2zeuN2SlLvDVVocjsPSL8/Rl/7zg=",
            "addresses": [
                {
                    "protocol": "udp",
                    "address": "roughtime.cloudflare.com:2003"
                }
            ]
        },
        {
            "name": "time.txryan.com",
            "version": "IETF-Roughtime",
            "publicKeyType": "ed25519",
            "publicKey": "iBVjxg/1j7y1+kQUTBYdTabxCppesU/07D4PMDJk2WA=",
            "addresses": [
                {
                    "protocol": "udp",
                    "address": "time.txryan.com:2002"
                }
            ]
        }
    ]
}

Multiple servers are recommended. Here is a community contributed list provided by Cloudflare.