A Study on Cross-Chain Bridge Technology for NFT-based Digital Content Licensing Agreements

The NFT-based marketplace in blockchain ecosystems has been rapidly expanding.NFTs allow various types of content, such as photos, videos, and game items, to be tokenized with unique values, making them ideal for proving ownership.Moreover, the use of NFTs and smart contracts for content licensing agreements has been increasing.However, issues have emerged with minting and selling NFTs that closely resemble or duplicate copyrighted works, leading to financial losses and disputes.These issues stem from the limited interoperability between different blockchain infrastructures due to differences in data structures, interfaces, and other factors.To solve these issues, this paper aims to design a cross-chain bridge technology that ensures the uniqueness of NFTs while enabling interoperability between blockchain.The proposed cross-chain bridge will be built on functionalities such as NFT lock, NFT validation, and NFT return.Through this paper, we expect to prevent copyright infringements, while also promoting the use of NFTs for licensing agreements.