EconomicPolicyJournal.com asked a bunch of economists whether Bitcoin was money. The vast majority discussed the “medium of exchange.” One wacko mentioned the medium of account:
Scott Sumner: I would say “no” or at least “not yet.” The most important aspect of money is its role as the medium of account, or numeraire. As long as most wages and prices are denominated in dollars rather than bitcoins, then it is not money. Bitcoins will be money if and when the CPI is reported in terms of bitcoin prices.