See CockroachDB’s Living Without Atomic Clocks [0]. TrueTime [1] is a proprietary Google technology. Considering TrueTime upper bound uncertainty (< 10ms) [2],

See CockroachDB’s Living Without Atomic Clocks [0]. TrueTime [1] is a proprietary Google technology. Considering TrueTime upper bound uncertainty (< 10ms) [2], it may depend on Google’s network quality and breadth. [0] https://www.cockroachlabs.com/blog/living-without-atomic-clocks/ https://www.cockroachlabs.com/blog/living-without-atomic-clo... [1] https://cloud.google.com/spanner/docs/true-time-external-consistency https://cloud.google.com/spanner/docs/true-time-external-con... [2] https://static.googleusercontent.com/media/research.google.com/en//archive/spanner-osdi2012.pdf https://static.googleusercontent.com/media/research.google.c...