Roughtime

This package implements a simple Roughtime client based on Google's implementation. To run it, do:

$ go get -u github.com/cloudflare/roughtime
$ go install github.com/cloudflare/roughtime...
$ getroughtime -ping roughtime.cloudflare.com:2002 \
    -pubkey gD63hSj3ScS+wuOeGrubXlq35N1c5Lby/S+T7MNTjxo=
ping response: 2018-09-20 10:26:56.327 -0400 EDT ±1s (in 16ms)

Or, better yet, use multiple servers!

$ getroughtime -config ~/go/src/github.com/cloudflare/roughtime/ecosystem.json
Cloudflare-Roughtime: 2018-09-20 10:25:10.568 -0400 EDT ±1s (in 14ms)
Google-Sandbox-Roughtime: 2018-09-20 10:25:10.587429 -0400 EDT ±1s (in 20ms)
int08h-Roughtime: 2018-09-20 10:25:10.618522 -0400 EDT ±1s (in 40ms)
delta: -12ms

For more information about Roughtime and tips for writing your own client, visit the developer documentation.

Ecosystem guidelines

We welcome pull requests for adding your Roughtime service to our list. Your PR should do the following:

• Add your server's configuration to ecosystem.json. The list of servers will be alphabetized by the "name" field.

• Add some information about your service to ecosystem.md. (This is also kept in alphabetical order.) This should include details about how your service is provisioned:

  1. how you synchronize your server's clock;
  2. if your code is open source, a link to the code;
  3. where in the world your server is located; and
  4. whether you will guarantee up time, and if so, how you will do so.

• Generate the ecosystem.json.go from the ecosystem.json. Use the go generate command for this.

A couple things to keep in mind:

• To be healthy, the Roughtime ecosystem needs a diverse set of time sources. The list already contains servers that are synced with Google's NTP servers; as such, servers that expose new sources will be preferred. (An atomic clock would be cool!)

• We reserve the right to prune this list at any time. (For example, if a server is unreliable, or its root secret key has been compromised.)

Finally, a disclaimer: the ecosystem is growing, and ours might not be the definitive list of who is serving Roughtime at any given time. For details about the current state and the future of the protocol, see Adam Langley's write up about the Roughtime ecosystem. There's also a Google group with ongoing discussion.