Non Fungible Mutable Tokens: dynamic assets traceability for the Metaverse

Abstract

In this paper we focus on the mutability of Non Fungible Tokens associated to digital assets in the metaverse. We argue that mutability is a key property of digital assets if we want to provide users with a virtual experience in the metaverse as close as possible to the real world. We discuss the shortcomings of current dynamic Non Fungible Token proposals, and present the advantages of a new mutable Non Fungible Token approach based on decoupling the asset ownership and descriptor in separate smart contracts. To show a possible usage of mutable Non Fungible Tokens in a metaverse, we provide a reference example about a university gadget. Finally, we present a proof of concept implementation of our reference example on the Decentraland metaverse and the Goerli Ethereum testnet to showcase its feasibility.