The British tycoon published a post Thursday warning the public to ignore bitcoin scams promoting themselves using his image.
The Australian Taxation Office issued a warning Monday alerting residents not to send cryptocurrencies to scammers claiming to be tax collectors.
Apple co-founder Steve Wozniak says he once lost seven bitcoin, worth more than $71,000 today, to a ruse involving a stolen credit card number.
Austrian authorities are pursuing suspects across Europe in an alleged bitcoin scam that led to millions of dollars in losses for investors.