What actually confirms that a stock has bottomed—not just paused its decline?

I’ve been trying to make my definition of a “bottom” less subjective. After a large decline, almost anything can be interpreted as bullish: lower volume, a few sideways sessions, one high-volume reversal, or the first higher low. But all of those can also happen before another leg down.

Name the top 2 signals you are looking at and what evidence tells you that you’re looking at a genuine bottoming process rather than another bear-market bounce?