I don’t see how bitcoin could ever be a store of value. It’s clear its value can evaporate overnight.
I agree it is a collectible item and medium of exchange.
I’m not quite sure what is meant by “unit of account.”
I have 10 bitcoins in my account? OK, it’s a unit of account.
“Value” is subjective, based on human wants/needs. As such, the value of anything could evaporate overnight (think Weimar Germany Marks, Zimbabwe dollars, Venezuelan Bolivars, US Greenbacks, Confederate Dollars, etc. Silver, as a monetary metal, is being demonitized as we speak ( look at the ever-increasing gold/silver ratio. The value of silver is being reduced to its value as an industrial metal.
That bitcoin has “value” is purely a market phenomenon-no one is forcing anyone to exchange fiat currency for it. It is a voluntary opt-in. People see value in its deflationary character, its censorship resistance, its unconfiscatability, and its network effects.
Unit of Account means that everyday items are priced in that particular money or currency. For bitcoin, that would be the “Satoshi”, the fundamental unit of bitcoin, which is 1 one-hundred millionth of a bitcoin. If bitcoin achieves large-scale adoption, then a gallon of milk would be priced in Satoshis.