Grayscale's ETF chief is bullish that regulators will eventually have to approve exchange-traded funds based on cryptocurrencies other than bitcoin and ether.

David LaValle, Grayscale's global head of ETFs, was asked during a roundtable discussion on Wednesday if he thought exchange-traded funds based on other cryptocurrencies might gain approval in the next two to three years.

"I think 100%," he said. "The path to digital asset ETFs happened to be through this regulated market on the futures side, but as the digital asset market holistically continues to expand and to mature, I mean, we've already proven that we can do it with Bitcoin [and] we're having a really fruitful conversation around Ethereum."

The roundtable discussion on ETFs and digital assets LaValle participated in on …