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Inside the Castello Brothers Smoothie Move Into Fractional Ownership of Domain Names

By Ron Jackson 

The idea of fractional ownership of domain names has been kicked around for the past 20 years but, due to a series of daunting legal and technical hurdles that had to be cleared, it has been a long road to making the fractionalization option a reality. Finally, D3, a company founded by a team of domain industry veterans led by Fred Hsu, created a new system called the Doma Protocol that allowed them to launch a new blockchain network for tokenizing and trading domain assets last November. Once they had built it, like Field of Dreams, the question became will they (buyers and sellers) come?

In the months since then millions of domains have been listed on Doma but at this early stage. several blocks remains to be laid. Recognition is a big one as it is for all new platforms. Many don't yet know the system exists and newcomers to it are still sorting through the questions that come from doing things in an entirely new way. How do you list names and who determines its value?  Who retains control of the fractionalized asset? Who decides when or if it will be sold to realize gains? Is there any was to gauge the prospects for a given name beyond gut instinct? 

Regarding recognition, top-tier one word .com domain names that would draw attention to the platform and interest from share buyers have been scarce. However, a big step forward in that direction came today (July 1, 2026) when veteran domain investors Michael Castello and David Castello (the founders of Castello Cities Internet Network in 1998 and the subject of a 2006 DNJournal Cover Story) opened their category-defining Smoothie.com domain name to fractionalization on Doma (trading here). Having their endorsement of the system and the spotlight that attracts is just as valuable  D3 to Doma as the listing itself. 

Many investors from the traditional domain world have been skeptical of blockchain related projects, so we asked David what won the Castello Brothers over in this case. "I started keeping an eye on DOMA the latter part of last year," he began. "I've always loved the concept of fractionalized domains and I watched Doma continue to grow. I've known Fred Hsu for years and ended up calling him to learn more about it. Then I talked with my brother and said, "They've got some good names but I don't see a category-defining 

Michael Castello & David Castello

global brand and we've got those. Michael said, OK, let's explore it. Then I learned that Susan Lawrence and Kathy Nielsen were working at D3 too, and I've known both of them for 20 years. I also talked with Gerardo Gonzalez a lot and the more we all talked it just felt right to take Smoothie.com to them. We really feel it'll take the DOMA concept to the next level." 

In the Doma system, the domain owner sets the value of the domain and what percentage of ownership they want to make available. The Castellos set the value of Smoothie.com at $3.5 million and elected to tokenize 10% of the asset in the form of 350,000 shares priced at $1 each. When they go on sale the market takes over from that point and the prices can rise and fall depending on demand. From the buyer's standpoint there are no dividends so they are paying for future potential, similar to growth stocks in that respect but without the accompanying data that plays a big role in choosing those.

The domain owner retains ownership and control of the domain (including any decision on selling it) and earns revenue from a commission on transactions. David added, "Doma does a lot of transactions. Will their revenue system be enough to justify using it for a high-value asset like Smoothie.com? That remains to be seen but we and Doma have the same goals. They have been very receptive to our creative input, have already made important changes we requested and will continue to do so. Other domain OGs have contacted us and are interested too - they are just waiting to see how this plays out with Smoothie.com."

The appearance of these kinds of assets on the new platform resets the stage at Doma. Since their launch, they've had a few months of "spring training" o work out the kinks and have added a big bat to the lineup. Now a new season begins. It's the top of the first inning with their new leadoff man (Smoothie.com) at the plate. 

Where it goes from here is anybody's guess and the jury will be out on that for some time to come. The market, as always, will decide. The arrival of more marquee domains should certainly help but in the end, the game will depend on potential investors seeing others making money from their investments in fractionalized domains. That's the ultimate proof of concept.

You can get full details on how the Doma process works for buyers and sellers from the Doma FAQ

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