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Bitcoin has a supply that’s limited by its code instead of the whim of a central authority is digital scarcity. Only 21 millions bitcoins will ever exist and no one can ever change that. Bitcoin's value proposition is based on the fact that as more bitcoins are bought, its price will inevitably go up and eventually sustain itself at higher and higher levels. The Stock-to-Flow model assumes that Bitcoin's price will continuously increase as the number of blocks per month do as well. The model is backed up by a 95% correlation to the actual relationship between its price movements and its historical investment performance as a reserve asset.