Tether is its "own worst enemy" and needs to be audited, according to co-founder William Quigley.
The claim comes via a source of an Indian business magazine.
Deputy Governor Adamu Lamtek said the CBN is not discouraging people from trading in cryptocurrency.
The central bank warned a Thai baht-denominated stablecoin is a threat to the stability of the currency system.
Russia's President Putin says crypto use by "criminal elements" is increasing and law enforcement must monitor it more closely.
The European Supervisory Authorities said some cryptocurrencies are "highly risky and speculative" in a new report.
The complainant said the ad targeted retirees and misled the public over the risks of bitcoin investment.
FINMA cited money-laundering defense "weaknesses" as one reason for the license denial.
Under current requirements, exchanges must hold an amount of fiat equivalent to the value of the crypto their clients are holding.
Belarusian protestors used bitcoin to support each other after a controversial election last year.
"The pitch is relatively simple – invest a little, gain a lot, and don’t worry about risk," the Texas State Securities Board said.
Only four out of 200 crypto businesses' applications to the FCA's Money Laundering Registration regime have seen a decision, said CryptoUK.
The Caribbean nation's finance minister announced plans to officially launch a CBDC during the annual national budget debate.
A looming regulatory clampdown following a major Ponzi scheme's collapse is already prompting some exchanges to flee abroad.
Rep. Warren Davidson said the window of opportunity for the U.S. to lead the world on blockchain technology is "closing."