Clients of BlackRock, the world's largest asset manager, are showing interest in Ethereum after Bitcoin, according to Robert Michenick, head of digital assets at BlackRock.

"Bitcoin is overwhelmingly the No. 1 interest for our clients, and we're seeing a little bit of interest in Ethereum," Michenick said at the Bitcoin Investor Day conference in New York. BlackRock received approval to launch a Bitcoin ETF in January, sparking optimism for the digital asset market.

BlackRock's Bitcoin fund proved so popular that it became one of the top five ETFs in the market, amassing $15 billion in assets within two months of launch. BlackRock says it decided to launch a Bitcoin ETF because clients have consistently expressed interest in Bitcoin, both in bull and bear markets.

Clients were also "frustrated" with the difficulty of investing in Bitcoin, Michenick added. Asked if BlackRock has any plans to launch an ETF related to the meme coin Dogecoin (WIF), Michenick said he doesn't know what Dogecoin is and dismissed a misconception in the crypto space that BlackRock will offer a range of services in the long term.