The wager Gartman made is proving to be painful.
The slow payments and high fees tied to bitcoin have led some criminals to seek alternatives.
Four companies with well-known brands have recently seen their stocks skyrocket after reports linked them to cryptocurrencies.
The start-up has scored the trifecta when it comes to utilizing the latest trendy buzzwords to attract attention.
The Winklevoss brothers said in 2013 that they owned almost $11 million worth of bitcoins.
But he's still starting a $500 million fund to investing in cryptocurrencies.
Bitcoin costs you about $6,125 apiece after blowing past the $5,000 and $6,000 price levels for the first time earlier this month.
The decline coincides with a slide in technology stocks.
The hot new digital currency is called ether, and it's gaining on bitcoin in marketshare.