# NFT Technology for Enhanced Global Digital Registers: A Novel Approach to Tokenization
## 4 High-Level System Design
### Non-Fungible Tokens  
NFTs will serve as the core component for representing unique digital resources in the system. Leveraging the ERC-721 standard, each NFT will have a unique identifier and metadata associated with the digital resource it represents. NFTs will be created, transferred, and managed through smart contracts, ensuring the immutability and traceability of the tokenization process.  
To enhance the functionality and versatility of our NFT-based system for global digital registries, we introduced the following advanced features:  
1 Enhanced Metadata Structure: We implement an extensible metadata schema that accommodates the specific requirements of various global registry types (e.g., ISBN, ISSN, DOI). This schema includes:  
- Core fields common to all registry types (e.g., unique identifier, creation date, owner);  
- Registry-specific fields (e.g., book title and author for ISBN, journal name and issue number for ISSN);  
- Extensible custom fields allow for future additions without system redesign.  
2 On-chain vs. off-chain Metadata: To optimize for gas costs and scalability, we implement a hybrid approach:  
- Essential, frequently accessed metadata is stored on-chain;  
- Larger, less frequently accessed data (e.g., detailed descriptions, high-resolution images) is stored off-chain using IPFS, with on-chain references.  
3 Fractional Ownership: We implement a fractional NFT (F-NFT) system that allows for partial ownership of digital assets. This is particularly useful for complex intellectual property scenarios or collaborative works, enabling:  
- Division of a single NFT into multiple fractions;  
- Trading of fractional ownership;  
- Automated royalty distribution based on ownership percentages.  
4 Dynamic NFIs: For digital resources that may evolve over time (e.g., regularly updated databases, living documents), we implement dynamic NFTs. These allow for:  
- Controlled updates to metadata without compromising the NFT's uniqueness;  
- Version history tracking;  
- Conditional metadata updates are based on predefined rules.  
5 Nested NFTs: To represent hierarchical relationships in certain registries (e.g., a book series in ISBN), we implement a nested NFT structure, allowing:  
- Parent-child relationships between NFTs;  
- Inheritance of certain properties from parent to child NFTs;  
- Efficient management of related digital assets.  
6 Interoperability Layers: We design our NFTs with cross-platform compatibility in mind, implementing:  
- Standard interfaces for interaction with various blockchain platforms;  
- Metadata translation layers for compatibility with existing registry systems.  
7 Privacy-Preserving NFTs: For sensitive digital assets, we incorporate privacy features such as:  
- Selective disclosure of metadata;  
- Integration with zero-knowledge proof systems for verification without full disclosure.  
These advanced NFT features ensure that our system can accurately represent and manage the diverse and complex nature of digital assets across various global registry systems while providing the flexibility to adapt to future needs and technological advancements.