Take heed, Hanshake has done the research and implemented prototype SMTs and concluded that they are *not* practical data stores and are inappropriate for blockchain applications. This is due to the heavy caching required for database lookups, which severely hindered usability.

See further research in this article I wrote: https://hackernoon.com/everything-you-didnt-know-about-the-handshake-naming-system-how-this-blockchain-project-will-483464309f33