Semantic Interoperability for NFT Marketplace-Agnostic Rendering of tokenized Assets using Ontology-Driven Metadata

Tokenization of real-world assets (RWAs) as non-fungible tokens (NFTs) is increasingly used to represent ownership and rights on blockchains. While NFTs are issued on a single blockchain, they may be traded across multiple marketplaces, each relying on different metadata schemas. This results in inconsistent interpretation of asset attributes such as valuation, usage rights, and provenance, limiting interoperability and reliable presentation of tokenized assets. In this paper, we present MOSAICO , a framework that introduces a shared semantic layer for NFT metadata. MOSAICO formalizes NFT metadata using a domain-specific ontology enabling precise and machine-interpretable representation of asset properties and constraints. An adaptive metadata adapter service then translates this semantic representation into marketplace-specific metadata formats, ensuring consistent interpretation and display across multiple platforms. The framework is validated through OWL reasoners HermiT and Pellet used for cross-validation and a custom full-branching tableau reasoner with justification and clash tracing used to explain satisfiability and inconsistencies in NFT class definitions. In addition, SPARQL queries verify structural constraints and semantic invariants across NFT instances. Experimental results show that MOSAICO enforces semantic consistency and enables marketplace-agnostic interpretation of tokenized assets.