I think its value comes from three characteristics: 1. Scarcity is obvious. There are 21 million in total.2. Storeability. The prerequisite for Bitcoin's existence is electronic equipment. If one day all electronic devices in the world are paralyzed, then even Bitcoin will die. Therefore, from this point of view, Bitcoin has a storage risk. But this possibility is very low, because it means that all mankind has returned to primitive society. And this probability is considered low enough to be negligible, so in fact, it can be considered that Bitcoin also has good storability.3. Ease of circulation. Bitcoin is better than gold. Any Bitcoin can be divided indefinitely and it is very easy to trade.