The move is said to be an attempt to stop capital flight from Iran.
The bank had previously stipulated only digital assets for import funding could be used by itself and no one else.
An Iranian lawmaker wants his country’s central bank to take bitcoin seriously.
Authorities in Iran have reportedly seized roughly 1,000 bitcoin mining machines from abandoned factories.
U.S. regulator FinCEN is urging domestic exchanges to prevent Iran from using cryptocurrency to bypass economic sanctions.
The Iranian government has recognized bitcoin mining as a lawful activity, briefly sending bitcoin prices to record levels at the country's exchanges.
The Central Bank of Iran is the latest national bank to sound the alarm on the cryptocurrencies, fearing of its misuse in money laundering and fraud.