The possibility that multinational firms may create and transact in their own cryptocurrencies is not "unreasonable" in the medium term, according to one blockchain expert.

"What we're seeing really is the democratization of money so you know, if you and I wanted to, we could create a CNBC coin," said Gavin Brown, co-founder and director at venture capital firm, Blockchain Capital Limited, at the Credit Suisse Global Supertrends Conference in Singapore. "Within three hours, we could have it up and running, and when we transact with people, we could request that we do it using that particular coin."

The question that remains is: "Will people trust that coin?"

"They will trust it if they trust your brand and if they trust your product," Brown told CNBC's Martin Soong on Tuesday.

To illustrate his point, Brown used the example of Starbucks prepaid cards.