Bitcoin has a lot of “killer features.” But only one is the foundation everything else stands on. My pick: 21M hard cap. Scarcity isn’t a feature. It’s the point. Without a fixed supply:• Halvings don’t matter• Difficulty adjustment just maintains a system with no edge• Store of value narrative collapses The 21M cap is what makes Bitcoin different from every other asset ever created. It’s the line in the sand. No inflation games. No policy changes. No human intervention. Everything else is reinforcement. What’s yours? View quoted note →