Existing NFTs confront restrictions of \textit{one-time incentive} and \textit{product isolation}. Creators cannot obtain benefits once having sold their NFT products due to the lack of relationships across different NFTs, which results in controversial possible profit sharing. This work proposes a referable NFT scheme to extend the incentive sustainability of NFTs. We construct the referable NFT (rNFT) network to increase exposure and enhance the referring relationship of inclusive items. We introduce the DAG topology to generate directed edges between each pair of NFTs with corresponding weights and labels for advanced usage. We accordingly implement and propose the scheme under Ethereum Improvement Proposal (EIP) standards, indexed in EIP-1155. Further, we provide the mathematical formation to analyze the utility for each rNFT participant. The discussion gives general guidance among multi-dimensional parameters. To our knowledge, this is the first study to build the referable NFT network, explicitly showing the virtual connections among NFTs.

翻译：现有NFT面临“一次性激励”和“产品隔离”的限制。由于缺乏不同NFT之间的关联，创作者在售出其NFT产品后无法获得持续收益，这导致了有争议的潜在收益分配问题。本文提出一种可引用NFT方案，以扩展NFT的激励可持续性。我们构建可引用NFT（rNFT）网络，以提升曝光度并强化包容性物品之间的引用关系。通过引入有向无环图（DAG）拓扑结构，我们为每对NFT之间生成带有相应权重和标签的有向边，以满足高级应用需求。据此，我们在以太坊改进提案（EIP）标准下实现并提出了该方案，索引编号为EIP-1155。进一步地，我们通过数学公式分析了每个rNFT参与者的效用函数，并针对多维参数给出了通用指导性讨论。据我们所知，这是首个构建可引用NFT网络、显式展示NFT之间虚拟关联的研究。