Note that Spanner always waits out the clock uncertainty on commit, while Cockroach doesn't need to do that - by design there are fewer situations in which the offset really matters. We can still benefit from a good bound in some situations, in particular you get global linearizability between causally unrelated transactions by waiting out the maximum clock offset (so just what Spanner does). BTW, I'm not sure when you would ever need the above guarantee, but it's cool! (disclaimer: actually working on the project).