Each libp2p message includes git head—and users fetch from peer whenever they see a head they don't have.

[holmesworcester]

We may need to limit how often this happens for performance reasons, which should be fine.

The real question here is: does everyone's view of the message history converge, and how long does that take in the worst case?

[holmesworcester]

Success here is reasonably rapid convergence.