Do you have a white paper or something? I saw some good blog posts, but I’m interested particularly in the differences with Zanzibar especially those that are the necessary result of the differences between cockroach and spanner.
As far as the differences due to cockroach vs spanner. There are only a few minor ones. Without TrueTime cockroachdb relies on their hybrid logical clocks[2] which at the very least require more storage. The Zanzibar paper talks about separating tuples into separate databases by namespace, and shards [3§3.1.1]. We haven't had to do that yet, but we are far from operating at Google's scale. Finally, cockroachdb's CHANGEFEED API[4] combined with our single tuple table have allowed us to skip storing a separate changelog table (for now).
[1]: https://authzed.com/blog/what-is-zanzibar/
[2]: https://www.cockroachlabs.com/blog/living-without-atomic-clo...
[3]: https://research.google/pubs/pub48190/
[4]: https://www.cockroachlabs.com/docs/v20.2/changefeed-for.html