Bitcoin's value comes from its properties. It is scarce, it can be transmitted around the world in seconds, it is easily divisible, it is created on a set schedule (which diminishes over time towards scarcity), and it exists outside any centralized organization. It's valuable for the same reasons that gold is valuable. It's a "backup" international value system. Sure, they are not identical, (gold is sometimes used in jewelry and has a longer history, Bitcoin is volatile in the current market), but gold is not easily divisible or instantly transmittable, and its possible that a couple decades from now bitcoin's price would be as boring as gold's is today. As for paying rent or buying groceries etc, you can't do those things in gold either, but it has value. To be clear, I am not a bitcoin nut or anything, I am of the opinion that most crypto is dumb/useless, just trying to provide a balanced perspective if you are actually wondering what actual value people see.