Quick answer
Rebirth is official, but exact reset details are not published through the Roblox APIs checked here. Treat rebirth as a planned end-of-run action until the in-game prompt is documented.
What is verified
The official description lists Rebirth and reaching the bottom as part of the loop. That is enough to explain why players should prepare for it.
What is not verified
This page does not claim retained cash, strength, pickaxes, multipliers, or bottom rewards without a screenshot of the rebirth prompt.
How to prepare
Before rebirthing, note your Strength, Cash, current pickaxe, and deepest layer. That simple record makes it possible to verify what changed.
Evidence boundary
Useful, but not overclaimed.
This page uses official Roblox data where available. Player-search topics are included only when they help answer a question safely.