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The value of bitcoin is determined by the people who are willing to purchase it at a given price. Due to this scenario, the law of demand/supply dictates its price on the market given that it only has a limited supply of 21 million (which by the year 2140, all bitcoins will be mined out).
If you based the price depending on its history, you can see that its price continuously increases/decreases depending on external and internal factors. While some claim that Bitcoin is a whole bubble, others see it as an alternative method for investment. But one thing has not changed, the price still continues to rise.
I would say that holding bitcoin can be a good store-of-value especially if you consider the long-term aspect of its potential and applicability in the future. Not to mention, we are only experiencing and enjoying its face-value and we have yet to see the blockchain be implemented in our transactions.