This might be interesting: https://www.cockroachlabs.com/blog/living-without-atomic-clocks/ https://www.cockroachlabs.com/blog/living-without-atomic-clo... Exc

This might be interesting: https://www.cockroachlabs.com/blog/living-without-atomic-clocks/ https://www.cockroachlabs.com/blog/living-without-atomic-clo... Excerpt: "...The designers of Spanner call this ‘TrueTime’, and it provides a tight bound on clock offset between any two nodes in the system. TrueTime enables high levels of external consistency. As an open source database based on Spanner, our challenge was in providing similar guarantees of external consistency without atomic clocks."