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[32], SuperRare [55], MakersPlace [33], Rare Art Lab[50], VIV3 [61]). This is an efficient way to manage and protect digital masterpieces. In addition, several platforms (e.g. Mintbase [37] and Mintable [36]) have even established tools to support ordinary people to create their own NFT works easily. Inspiring the Metaverse. Metaverse is a collective virtual shared space that allows all types of digital activities. Generally, it covers a set of techniques like augmented reality and the Internet to establish the virtual world. The concept stems from the last decades and has a great process with the rapid development of blockchain. Blockchain provides an ideal decentralized environment for the vir- tual online worlds. Participants under this blockchain-fueled alternative realities [46] can have many types of intriguing use cases like enjoying games, displaying self-made arts, trading assets and virtual properties (arts, land parcels, names, video shots, wearables), etc. In addition, users also have opportunities to get profits from the virtual economy. They can lease the buildings (such as offices) to others to earn the bond or raise rare pets and sell them to get the rewards. Primary blockchain-empowered projects are Decentraland [1], Cryptovoxels [22], Somnium Space [53], MegaCryptoPolis [35] and Sandbox [3]. In fact, the meta- verse ecosystem covers all aforementioned applications. We list it separately here simply because it is still in an early stage due to the complexity. 6 Challenges To enable the development of the above NFT applications, a series of barriers have to be overcome as with any nascent technologies. We discuss some typical challenges from the perspectives of usability, security, governance, and extensi- bility, covering both the system level issues caused by blockchain-based platforms and human factors such as governs, regulation, and society. 6.1 Usability Challenges Usability is to measure the users’ effectiveness, efficiency, and satisfaction when testing a specific product/design. Most of NFT schemes are built on top of Ethereum. Therefore, it is obvious that the main drawbacks of Ethereum are inherited. We discuss two major challenges that have direct impacts on the user experience. - Slow confirmation. NFTs usually send the transactions to the smart con- tract to achieve reliable and transparent management (such as mint, sell, exchange). However, current NFT systems are closely coupled with their underlying blockchain platforms, which makes them suffer from low perfor- mance (Bitcoin reaches merely 7 TPS [105] while Ethereum only 30 TPS). This results in extremely slow confirmation of NFTs. Conquering this issue requires a redesign of the blockchain topology [109], optimization of its struc- ture [106][84] or improvement on the consensus mechanisms [67]. Existing blockchain systems cannot fulfil such requirements. 12PDF Image | Non-Fungible Token (NFT): Overview, Evaluation, Opportunities
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IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
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NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
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