Countries like Poland could use the euro as a unit of account without even joining the union.

FORBES: May the Best Currency Win

But Bitcoin is rarely, if ever, used as a unit of account.

FORBES: No, Bitcoins Aren't In Danger From "Hyperdeflation"

The currency itself is meandering along, the way it is supposed to, without any particular issues, serving as a unit of account and means of payment.

FORBES: Magazine Article

They are not using it as a medium of exchange, a unit of account, or a safe store of nominal value.

FORBES: World Bank Chief Riles Up Economists By Talking Gold Standard

Deflation is harmful for conventional currencies because, in economist jargon, Bitcoins are a unit of account as well as a medium of exchange.

FORBES: No, Bitcoins Aren't In Danger From "Hyperdeflation"

As the mechanism for a decentralized, nonpolitical unit of account, the Bitcoin project uniquely facilitates this protection.

FORBES: Bitcoin Prevents Monetary Tyranny

As much as politicians and many economists embrace a floating unit of account, its impact on the economy is always negative.

FORBES: The Fed Cannot Create Economic Growth

As both a payments platform and a nonpolitical unit of account, Bitcoin has already seen astonishing growth in just over three years.

FORBES: Bitcoin Foundation Launches To Drive Bitcoin's Advancement