The original idea of non-fungible tokens (NFTs) might soon get a competitor as one of the Ethereum co-founders, Vitalik Buterin, expressed support for the so-called "non-transferable NFTs."

While NFTs — according to Buterin — represent only wealth, non-transferable NFTs can not be transferred, sold or taken away from their owner, and this concept possesses certain unnoticed before value.

In a recent blog post, Buterin wrote there is a "large and underexplored design space of what non-transferable NFTs could become."

Read more: Digital artists anticipate spike in AI-generated NFTs

One of the implementations of the new NFT standard might be PoAP (proof-of-attendance), a protocol that distributes NFTs to illustrate that their owners personally attended an event.

Buterin believes the concept might find its use case in citizenship or residency, where non-transferable NFTs are only available to real-world residents of the city.

However, the Ethereum co-founder noted that there's still a lot of work to be done to ensure that personal on-chain data does not get publicly mapped.