Rakiya Mohammed, the bank's information technology director, revealed the date during a private webinar on Thursday.
Crypto communities world-wide have found ways around government bans, and Nigeria is no exception.
A central bank official said Nigeria has been researching CBDCs for two years.
Deputy Governor Adamu Lamtek said the CBN is not discouraging people from trading in cryptocurrency.
The "Naira 4 Dollar Scheme" is a bid to funnel remittances through official channels. Meanwhile, peer-to-peer bitcoin remains popular.
These scams are raking in tens of thousands of dollars in crypto a month, blockchain analytics firm Whitestream determined.
The premium rose after the Central Bank of Nigeria reminded banks they could not provide crypto exchanges with financial services.
The Nigerian cryptocurrency community has been turning to peer-to-peer exchange platforms to continue trading.
The Nigerian Senate wants Central Bank Governor Godwin Emefiele and chief securities regulator Lamido Yuguda to testify about cryptocurrencies.
Some Nigerians plan to continue using bitcoin (BTC) and other cryptocurrencies despite a directive issued by the Central Bank of Nigeria (CBN) last week ordering banks to close down accounts associated with cryptocurrencies.
Both nations hope to prevent banks from providing services to crypto companies.
The Central Bank of Nigeria said its warning to banks on Friday was not a new position, but a reiteration of its 2017 stance on cryptocurrencies.
Nigeria's central bank told financial institutions they couldn't provide crypto companies or users with services on Friday.