But the regression theorem requires that the money have value each prior day, even when you get all the way back to the day before the moneystuff became money. Hence the need for an intrinsic value. According to the regression theorem, the pizza maker must have some idea of bitcoin worth, and with no prior exchanges it must have been the intrinsic value. Thats why it seems the regression theorem does not work for bitcoins. You either have to use fantasy and invent some intrinsic value, or you have to modernize the regression theorem.
"People today expect money to have a certain purchasing power tomorrow, because of their memory of its purchasing power yesterday."
You just refuted the regression theorem here. I don't disagree.
And where did I accomplish this mighty task?
Writing that I did it is not proving I did it.
The regression theorem state tomorrow expected purchasing power of money is dependent on the known yesterday's purchasing power of money.
The regression is not infinite because there must be a starting point.
For fiat money is when the fiat money was backed by gold; for gold is when it was for the first time exchanged to be used for an indirect exchange (the reason money exist is indirect exchange); for bitcoin was when two pizzas were exchange for 10K btc.
Why gold was exchanged for paper, goats for gold and pizza for Bitcoin is unimportant as praxeology deal not with the reasons of actions but with the consequences of actions.