  ]A multichain non-fungible tokens (NFTs) marketplace is a decentralized
platform where users can buy, sell, and trade NFTs across multiple blockchain
networks by using cross communication bridge. In past most of NFT marketplace
was based on singlechain in which NFTs have been bought, sold, and traded on a
same blockchain network without the need for any external platform. The
singlechain based marketplace have faced number of issues such as performance,
scalability, flexibility and limited transaction throughput consequently long
confirmation times and high transaction fees during high network usage.
Firstly, this paper provides the comprehensive overview about NFT Multichain
architecture and explore the challenges and opportunities of designing and
implementation phase of multichain NFT marketplace to overcome the issue of
single chain-based architecture. NFT multichain marketplace architecture
includes different blockchain networks that communicate with each other.
Secondly, this paper discusses the concept of mainchain interacting with
sidechains which refers to multi blockchain architecture where multiple
blockchain networks are connected to each other in a hierarchical structure and
identifies key challenges related to interoperability, security, scalability,
and user adoption. Finally, we proposed a novel architecture for a multichain
NFT marketplace, which leverages the benefits of multiple blockchain networks
and marketplaces to overcome these key challenges. Moreover, proposed
architecture is evaluated through a case study, demonstrating its ability to
support efficient and secure transactions across multiple blockchain networks
and highlighting the future trends NFTs and marketplaces and comprehensive
discussion about the technology.
