valid currency

Some Bitcoiners believe in an inevitable coming "hyperbitcoinization" in which bitcoin will be the only valid currency.

Jayne Thompson, a physicist at the Singapore-based company Horizon Quantum Computing, who was not affiliated with the study, explains this finding by likening identical-particle entanglement to “a valid currency” that can be exchanged for other operationally useful physical properties.

Austin strip clubs don't consider them valid currency.

Mint was unavailable to answer the question of whether the nail/dime is considered valid currency.

Mint was unavailable to answer the question of whether the nail/dime is considered valid currency.